Type Material: Holotype, ♀, “Hel.090” (IEBR), NW Vietnam: Son La, Moc Chau, 900 m, bushes, 25.iv.2014, sweep net, K.D. Long.

Distribution: NW Vietnam: Son La.

Biology: Unknown.

Diagnosis: Antenna with 35 segments and antennal segments 10–18 cream white; frontal protuberance lamelliform and acute dorsally; height of eye 1.55× width of temple in lateral view. Mesosoma 1.9× longer than high (in lateral view); notauli deep, crenulate anteriorly, posteriorly areolate-rugose and with a median carina; propodeum without areola, coarsely rugose. Foretarsus 1.3× as long as foretibia; length of forewing 3.3× its maximum width; vein 3-SR 1.15× vein r; vein 2-M 2.3× 3-SR; hind wing vein 1-M 0.95× vein 1r-m; basal cell distinctly widened apically; vein 2-SC+R vertical; hind wing with four hamuli. Hind femur only with ventral serrations; length of hind femur 3.5× its maximum width (without serrations); outer side of hind coxa and femur sparsely finely punctate. First tergite short, 0.9× as long as its apical width; dorsal carinae present in basal 0.4 of tergite; median length of second tergite 0.5× its basal width and 1.2× third tergite; first tergite foveate-rugulose medially, largely rugose laterally; second tergite punctate-reticulate medially and rugose-punctate laterally.

Description: Holotype, ♀, body length 8.4 mm, antenna 6.2 mm, forewing length 6.9 mm, ovipositor sheath 7.0 mm (fig. 1).

Head: Antenna with 35 segments; third antennal segment 1.1× as long as fourth (16:14); in anterior view height of eye 2.6× as long as its transverse width (34:13); width of face 2.2× length of face and clypeus combined (50:23); malar space 0.75× as long as mandible width (15:20) and 0.6× height of eye (20:34) (fig. 3); maxillary palp missing; distance between tentorial pits equal to distance from pit to eye margin; in dorsal view width of head 1.7× its median length (80:47); height of eye 1.55× as long as temple (28:18); POL:OD:OOL = 9:7:16; distance between anterior and posterior ocelli 0.25× as long as OOL (4:16) (fig. 2); frontal protuberance lamelliform and acute dorsally (fig. 4); in lateral view length of eye 1.4× its transverse width (36:26); transverse width of eye 1.4× width of temple (26:19) (fig. 5); face coarsely rugose; frons, vertex, and temple almost smooth, somewhat coriaceous.

Mesosoma: Mesosoma 1.9× longer than its height (79:42) (in lateral view); pronotal side crenulate anteriorly and medially, rugose ventrally and dorsally; mesopleuron almost flat, coriaceous (fig. 7); metapleuron areolate-rugulose; notauli deep, crenulate anteriorly, posteriorly areolate-rugose with a coarse median ruga (fig. 6); median lobe of mesoscutum smooth anteriorly, foveolate-rugose posteriorly; lateral lobes of mesoscutum almost smooth; scutellar sulcus deep, with carinae, 0.75× as long as scutellum (12:16); scutellum narrowed laterally, coriaceous; propodeum without areola, transversely rugose (fig. 8).

Wings. Forewing: length of forewing 3.3× its maximum width (116:35); pterostigma 3.5× longer than wide (46:13); vein r arising from middle of pterostigma (16:30); vein 3-SR 1.2× vein r (15:13); r:2-SR:3-SR:SR1:r-m = 13:20:15:83:19; vein cu-a oblique, 1-CU1:cu-a:2-CU1 = 5:14:23; second submarginal cell trapezium-shaped, long base 2.3× as long as short base (35:15) (fig. 12); hind wing vein 1-M 0.95× as long as vein 1r-m (19:20); basal cell distinctly widened apically; vein 2-SC+R vertical (fig. 13); hind wing with four hamuli.

Legs: Foretarsus 1.3× longer than foretibia (55:43); hind femur with ventral serrations, without tooth-shaped protuberance (fig. 10); length of hind femur (without serrations), tibia, and basitarsus 3.5 (56:16), 8.3 (75:9), and 6.5× (26:4) as long as their maximum width, respectively; hind tibia distinctly curved subbasally (fig. 9); hind basitarsus 0.8× as long as hind tibia (59:75); hind basitarsus 0.74× as long as hind tarsal segments 2–5 (26:35); fourth hind tarsal segment 0.40× as long as telotarsus (4:10); outer side of hind coxa and femur sparsely finely punctate (figs. 9, 10).

Metasoma: Metasoma 0.7× as long as head and mesosoma combined (34:50); first tergite short, 0.9× as long as its apical width (46:49) (fig. 11); dorsal carinae present in basal 0.4 of tergite (20:46); median length of second tergite 0.5× as long as its basal width (24:51), and 1.2× as long as third tergite (24:20); first tergite foveate-rugulose medially, largely rugose laterally; second tergite punctate-reticulate medially and rugose-punctate laterally; third tergite smooth (fig. 11); ovipositor sheath slightly longer than forewing (70:69).

Color: Body black, scapus brown; remainder of antenna brown with third and fourth segments yellow and segments 10–18 cream white; palpi pale yellow; fore- and middle legs yellow, except whitish yellow tarsus; hind leg yellow, but hind tarsus whitish yellow, femur and tibia apically dark brown (figs. 9, 10); pterostigma brown; wing veins brownish yellow; wing membrane hyaline (figs. 12, 13).

Male: Unknown.

Etymology: From angulus (Latin for “corner, bend”), because the mandible is angularly bent ventrally.

Type Material: Holotype, ♀, “Hel.049” (IEBR), NC Vietnam: Ha Tinh, Huong Son, 18°22′N 106°13′E, 900 m, April 20–28, 1998, Malaise [trap], AMNH, K. Long.

Distribution: NC Vietnam: Ha Tinh (Huong Son).

Biology: Unknown.

Diagnosis: Antenna with 38 segments, with antennal segments 11–20 cream white; maxillary palp 1.6× as long as head; frontal protuberance long, acute and raised higher than lateral carinae of frons; in dorsal view width of head 1.6× its median length; height of eye 1.55× temple. Length of mesosoma 1.9× as long as high; notauli wide and shallow, largely rugose, fused posteriorly with longitudinal rugosities; scutellum rather short, rugose; propodeum coarsely rugose. Foretarsus 1.2× longer than foretibia; forewing 3.1× longer than its maximum width; vein 3-SR short, 0.6× vein r; second submarginal cell trapezium-shaped, vein 2-M 3.7× 3-SR; vein 1-M of hind wing 0.55× vein 1r-m; vein 2-SC+R transverse; hind wing with 4 hamuli. Hind femur robust, with a rather wide obtuse protuberance, without distinct ventral serrations; length of hind femur (without protuberance) 3.1× its maximum width; outer side of hind coxa sparsely finely punctate; hind femur densely punctate laterally. First tergite 1.1× longer than its apical width; dorsal carinae in basal 0.7 of tergite; median length of second tergite 0.6× as long as its basal width, and 1.15× third tergite; first tergite largely smooth basally, transversely rugose mediolaterally and nearly areolate-rugulose medioapically; second tergite punctate-reticulate, but smooth medially and remainder shiny and smooth.

Notes: W. aspera, sp. nov., runs in the key by Yan et al. (2017) to W. zhejiangensis Yan and van Achterberg, 2017, from China and can be separated as follows: (1) frontal protuberance near antennal sockets evenly narrowed from base to apex, roundly pointed apically (frontal protuberance with posterior protruding narrow lamella in W. zhejiangensis); (2) forewing vein r 1.7× vein 3-SR (1.1× in W. zhejiangensis); and (3) hind wing vein 1-M 0.55× vein 1r-m (0.4× in W. zhejiangensis).

The new species is also similar to W. albobasalis van Achterberg and Chen, 2017, from China, but differs from the latter by having: (1) hind femur slender, length 3.1× its maximum width (2.8× in W. albobasalis); (2) vein r of forewing 1.7× vein 3-SR (1.1× in W. albobasalis); (3) vein 1-M of hind wing 0.55× vein 1r-m (0.4× in W. albobasalis); and (4) occiput smooth (sparsely punctate in W. albobasalis), 11th–20th antennal segments 11–20 cream white (3–11 in W. albobasalis).

Description: Holotype, ♀, body length 11.4 mm, forewing length 7.5 mm, ovipositor sheath 7.7 mm (fig. 14).

Head: Antenna with 38 segments; third antennal segment 1.2× fourth (19:17); in frontal view height of eye 2.1× its transverse width (27:13); width of face 1.85× length of face and clypeus combined (39:21); malar space 1.2× as long as mandible width (18:15) and 0.5× height of eye (18:39) (fig. 16); maxillary palp 1.6× as long as head (50:32); in dorsal view, width of head 1.6× as long as median length (75:47); height of eye 1.5× as long as temple (30:20); POL:OD:OOL = 10:7:19 (fig. 15); distance between front and hind ocelli 0.3× as long as OOL (6:19); in lateral view, length of eye 1.3× as long as transverse width (38:30) (fig. 17); frontal protuberance long, acute and raised above lateral carinae of frons; face coarsely rugose; frons deeply depressed, smooth; vertex rugose-punctate anteriorly and smooth medioposteriorly; occiput largely smooth; temple nearly rugose-punctate, but coarsely rugose ventrally.

Mesosoma: Mesosoma 1.9× longer than high (100:52); pronotal side coarsely rugose; mesopleuron largely smooth medially, rugose-punctate ventrally (fig. 19); metapleuron coarsely rugose; median lobe of mesoscutum nearly finely punctate, but rugose lateroapically; notauli wide and shallow, largely rugose, fused posteriorly with longitudinal rugosities (fig. 18); scutellar sulcus with 4 carinae, 0.5× as long as scutellum (7:13); scutellum rather short, rugose; propodeum coarsely rugose (fig. 21).

Wings. Forewing: length of forewing 3.1× its maximum width (140:45); pterostigma 2.9× longer than wide (38:13); vein 3-SR short, 0.6× vein r (7:12); r:2-SR:3-SR:SR1:r-m = 12:17:7:65 :16; vein cu-a oblique, 1-CU1:cu-a:2-CU1 = 6:17:28; second submarginal cell trapezium-shaped, vein 2-M 3.7× 3-SR (26:7) (fig. 20). Hind wing with vein m-cu as an antefurcal spectral trace; vein 1-M 0.55× as long as vein 1r-m (10:18); vein 2-SC+R transverse (fig. 22); hind wing with 4 hamuli.

Legs: Foretarsus 1.2× as long as foretibia (43:35); hind femur robust, with rather a wide obtuse protuberance, without distinct ventral serrations (fig. 25); length of hind femur (without protuberance), tibia, and basitarsus 3.1 (74:24), 9.2 (110:12), and 5.5× (33:6) as long as their maximum width, respectively; hind tibia evenly curved basally (fig. 26); hind basitarsus 0.3× as long as hind tibia (33:110); hind basitarsus 0.7× as long as hind tarsal segments 2–5 (33:49); fourth hind tarsal segment 0.4× as long as telotarsus (6:16). Outer side of hind coxa sparsely finely punctate (fig. 24); hind femur densely punctate laterally.

Metasoma: Metasoma about as long as head and mesosoma combined (65:66); first tergite 1.1× longer than its apical width (36:33) (fig. 23); dorsal carinae in basal 0.7 of tergite (31:43); median length of second tergite 0.6× as long as its basal width (31:52), and 1.15× third tergite (31:27); first tergite almost smooth basally, transversely rugose mediolaterally, nearly areolate-rugulose medioapically; second tergite as long as third (19:19); second tergite punctate-reticulate (fig. 23); remainder of metasoma shiny, smooth; ovipositor sheath slightly longer forewing (77:75).

Color: Body black, scapus brown; antenna brown with antennal segments 11–20 cream white; palpi whitish yellow, but first and second segments yellowish brown; fore- and middle legs yellow, but tarsus whitish yellow; hind coxa yellow; hind femur yellow basally and brown apically (fig. 25); hind tibia whitish yellow, but infuscate apically (fig. 26); pterostigma brown, but yellow basally; wing veins brownish yellow; wing membrane hyaline (figs. 20, 22).

Male: Unknown.

Etymology: From asper (Latin for “rough,” “harsh”), because the flat medioposterior area of mesoscutum is coarsely rugose.

Type Material: Holotype, ♀, “Hel.076” (IEBR), NW Vietnam: Son La, coffee orchard, M[alaise] T[rap], 21°18′06″N 103°55′36″E, 663 m, 01.v.2017, K.D. Long.

Distribution: NW Vietnam: Son La.

Biology: Unknown.

Diagnosis: Antenna with 32 segments; antennal segments 11–14 cream white; maxillary palp short, 1.1× length of head; in dorsal view width of head 1.6× its median length; height of eye 2.4× temple; frontal protuberance acute, slightly higher than lateral frontal carina. Mesosoma 2.3× longer than high; notauli crenulated, fused posteriorly with transversely rugose area; propodeum with basal carina and areola; areola and propodeum medially areolate-rugulose, coriaceous basally and apically. Length of forewing 3.3× its maximum width; vein 3-SR slightly longer vein r; vein 2-M 2.6× 3-SR; hind wing vein 1-M 0.7× vein 1r-m; vein 2-SC+R transverse; hind wing with 3 hamuli. Foretarsus 1.4× as long as foretibia; hind femur only with ventral serrations; length of hind femur (without serrations) 3.7× its maximum width; outer side of hind coxa almost smooth, with scattered fine punctures; hind femur rugose-punctate. First metasomal tergite widened from base to apex, length 1.1× its apical width (fig. 34); first tergite with dorsal carinae in basal 0.9 of tergite; median length of second tergite 0.55× as long as its basal width; second tergite slightly longer than third tergite; first tergite nearly smooth basally and laterally, foveate-rugulose medioapically; second suture distinct; second tergite punctate laterally and foveate-punctate medially; third tergite smooth.

Notes: W. coffeana, sp. nov., runs out in couplet 3 of the key by Yan et al. (2017), because of the following characters: frontal protuberance near antennal sockets blunt dorsally; scapus densely setose ventrally; ventral margin of hind femur without tooth-shaped protuberance and only with serrations; first metasomal tergite pale yellow and smaller (body length 4.3 mm).

Description: Holotype, ♀, body length 4.3 mm, forewing length 3.6 mm, ovipositor sheath 3.5 mm (fig. 27).

Head: Antenna with 32 segments; third antennal segment 1.1× fourth (9:8); in frontal view height of eye 2.1× its transverse width (19:9); width of face 2.0× length of face and clypeus combined (26:13); malar space 0.85× as long as mandible width (6:7) and 0.3× height of eye (6:22) (fig. 29); maxillary palp short, 1.1× length of head (36:34); in dorsal view width of head 1.6× as long as its median length (43:27); height of eye 2.4× as long as temple (17:7); ocelli in high triangle, POL:OD:OOL = 6:4:9; distance between front and hind ocelli 0.3 as long as OOL (3:9) (fig. 28); in lateral view height of eye 0.9× as long as transverse width (23:15); width of eye 1.7× as long as temple (15:9) (fig. 30); frontal protuberance acute, slightly higher than lateral frontal carina (fig. 28); face rugose; frons, vertex, and temple smooth.

Mesosoma: Mesosoma 2.3× longer than high (80:35) (fig. 32); pronotal side largely carinate-rugose medially, largely rugose dorsally and ventrally; mesopleuron slightly depressed medially, largely smooth (fig. 32); metapleuron coarsely rugose; lobes of mesoscutum largely smooth; notauli crenulated, fused posteriorly with transversely rugose area; scutellar sulcus deep, curved, with one carina, 0.55× as long as scutellum (5:9) (fig. 31); scutellum coriaceous; propodeum with basal carina and areola; areola and propodeum medially areolate-rugulose, coriaceous basally and apically (fig. 33).

Wings. Forewing: length of forewing 3.3× its maximum width (107:32); pterostigma 3.7× longer than wide (26:7); vein 3-SR slightly longer than vein r, r:2-SR:3-SR:SR1:r-m = 5:9:6:42:7; vein 1-CU1 nearly quadrate (fig. 35); cu-a:2-CU1 = 7:14;, vein 2-M 2.6× 3-SR (13:5) (fig. 35);; hind wing vein 1-M 0.7× vein 1r-m (6:9); vein 2-SC+R transverse (fig. 37); hind wing with 3 hamuli.

Legs: Foretarsus 1.4× as long as foretibia (19:14); hind femur with ventral serrations, without ventral tooth-shaped protuberance (fig. 36); length of hind femur (without serrations), tibia, and basitarsus 3.7 (52:14), 7.7 (69:9), and 5.5× (22:4) as long as their maximum width, respectively; hind basitarsus 0.3× as long as hind tibia (22:69), and 0.6× as long as second–fifth hind tarsal segments (22:36); fourth hind tarsal segment 0.45× as long as telotarsus (5:11); outer side of hind coxa almost smooth, with scattered fine punctures; hind femur rugose-punctate (fig. 36).

Metasoma: Metasoma 0.9× as long as head and mesosoma combined (48:55); first metasomal tergite widened from base to apex, 1.1× longer than its apical width (31:28) (fig. 34); first tergite with long dorsal carinae in basal 0.9 of tergite (27:31); median length of second tergite 0.55× its basal width (16:29), and slightly longer third tergite (16:15); first tergite nearly smooth basally and laterally, foveate-rugulose medioapically; second suture distinct; second tergite punctate laterally and foveate-punctate medially; third tergite smooth; ovipositor sheath about as long as forewing (35:36).

Color: Body dark brown, antenna brown, yellowish brown basally, with 11th–14th antennal segments cream white; palpi pale yellow; fore- and middle legs yellow; hind coxa, trochanter and trochantellus yellow; hind femur yellow basally and brown apically; hind tibia brown, but whitish yellow basally; hind tarsus pale yellow, but basitarsus basally and telotarsus brown; pterostigma and wing veins brownish yellow; wing membrane hyaline; first metasomal pale yellow; second–sixth tergites brown; ovipositor sheath brown.

Male: Unknown.

Etymology: Named after the plant genus Coffea Linnaeus, because the new species was collected in a Malaise trap set in a coffee orchard.

Type Material: Holotype, ♀, “Hel.016” (IEBR), NC Vietnam: Ha Tinh, Huong Son, 18°22′N 106°13′E, 900 m, April 20–28, 1998, Malaise [trap], AMNH, K. Long.

Distribution: NC Vietnam: Ha Tinh (Huong Son).

Biology: Unknown.

Diagnosis: Antenna with 46 segments; antennal segments 13–26 cream white; maxillary palp long, 1.9× longer than head; frontal protuberance behind antennal sockets blunt apically, much higher than lateral frontal carina; in dorsal view width of head 1.4× median length; height of eye 1.2× temple; in lateral view, height of eye 1.5× its transverse width; transverse width of eye 1.2× temple. Mesosoma 2.4× longer than high; notauli crenulated anteriorly, fused with longitudinal rugosities posteriorly; propodeum with basal carina and areola, rugulose-lacunose baso-laterally and sparsely rugose apically. Length of forewing 3.6× its maximum width; pterostigma 4.0× as long as wide; vein 3-SR 1.85× longer vein r; vein 2-M 1.7× 3-SR; hind wing vein 1-M 1.2× vein 1r-m; vein 2-SC+R long, 0.4× vein 1r-m; hind wing with 4 hamuli. Foretarsus 1.6× foretibia; hind femur slender, with ventral serrations and stout tooth-shaped protuberance; length of hind femur (without tooth or serrations) 4.7× as long as its maximum width; outer side of hind coxa and femur evenly punctate. First metasomal tergite long, slightly narrowed apically, 2.3× as long as its apical width; dorsal carinae in basal 0.6 of tergite; second tergite long and almost parallel sided, median length of second tergite 1.5× its basal width, and 1.4× third tergite; second suture faint medially; first tergite nearly smooth laterally and apically, areolate-rugulose basally and medially; second and third tergites largely smooth.

Notes: W. elongata, sp. nov., is similar to W. eurygenys Yan and Chen, 2017, from China according to couplet 3b of the key by Yan et al. (2017), but differs as follows: (1) length of first metasomal tergite 2.3× as long as its apical width (1.4× in W. eurygenys); (2) vein r of forewing 0.5× 3-SR (0.8× in W. eurygenys) and (3) vein 1-M of hind wing 1.2× longer than vein 1r-m (1-M 0.7× 1r-m in W. eurygenys).

Description: Holotype, ♀, body length 13.5 mm, forewing length 10.6 mm, ovipositor 28.2 mm (fig. 38).

Head: Antenna with 46 segments; third antennal segment 1.05× as long as fourth segment (23:22); in frontal view height of eye 2.0× its transverse width (32:16); width of face 1.8× length of face and clypeus combined (41:23); malar space 0.9× as long as mandible width (16:18) and 0.3× height of eye (16:48) (fig. 40); maxillary palp long, 1.9× as long as head (65:34); distance between tentorial pits 0.9× distance between pit and eye (13:14); frontal protuberance behind antennal sockets blunt apically, much higher than lateral frontal carina; in dorsal view width of head 1.4× its median length (68:49); height of eye 1.2× as long as temple (24:20) (fig. 39); ocelli in high triangle, POL:OD:OOL = 11:7:21; distance between front and hind ocelli 0.3× OOL (7:21) (fig. 39); in lateral view height of eye 1.5× as long as its transverse width (33:22); transverse width of eye 1.2× as long as temple (22:19) (fig. 41); face coarsely rugose; frons and vertex smooth; temple smooth with scattered fine punctures.

Mesosoma: Mesosoma 2.4× longer than high (66:27); notauli crenulated anteriorly, fused with longitudinal rugosities posteriorly (fig. 42); median lobe of mesoscutum largely sparsely punctate, but rugose-punctate laterally; lateral lobes of mesoscutum sparsely punctate; scutellar sulcus rugose, with one median carina, 0.6× as long as scutellum (14:22); scutellum rugose-punctate; pronotal side coarsely carinate-rugose medially, punctate dorsally, largely rugose ventrally; mesopleuron flat and smooth medially, sparsely punctate dorsally and ventrally (fig. 43); metapleuron foveate-rugose medially, coarsely rugose ventroapically; propodeum with basal carina and areola, rugulose-lacunose baso-laterally, sparsely rugose apically (fig. 45).

Wings: Length of forewing 3.6× its maximum width (107:30); pterostigma 4.0× as long as wide (32:8); vein 3-SR 1.85× longer vein r; r:2-SR:3-SR:SR1:r-m = 7:12:13:56:10; vein 1-M distinctly curved (fig. 47); vein 1-CU1 thick, 1-CU1:cu-a:2-CU1 = 6:21:38; vein 2-M 1.7× 3-SR (38:22). Hind wing: vein 1-M 1.2× longer vein 1r-m (14:12); vein 2-SC+R long, 0.4× as long as vein 1r-m (5:12); hind wing with 4 hamuli.

Legs: Foretarsus 1.6× longer than foretibia (66:42); hind femur slender, with ventral serrations and stout tooth-shaped protuberance (fig. 44); length of hind femur (without tooth or serrations), tibia, and basitarsus 4.7 (84:18), 12.7 (127:10), and 8.75× (35:4) as long as their maximum width, respectively; hind basitarsus 0.3× as long as hind tibia (35:127), and 0.6× as long as hind tarsal segments 2–5 (35:56); fourth hind tarsal segment 0.4× as long as telotarsus (6:14); hind coxa and femur evenly punctate (fig. 44).

Metasoma: Metasoma 0.95× as long as head and mesosoma combined (56:59); first metasomal tergite long, slightly narrowed apically, 2.3× longer than its apical width (80:35) (fig. 46); dorsal carinae in basal 0.7 of tergite (53:80); second tergite long and almost parallel sided, median length of second tergite 1.5× its basal width (52:35), and 1.4× third tergite (52:37) (fig. 46); first tergite largely smooth laterally and apically, areolate-rugulose basally and medially (fig. 46); second suture faint medially; second and third tergites largely smooth; tergites 4–6 protruding latero-posteriorly; ovipositor sheath missing, ovipositor very long, 2.7× as long as forewing (282:106), and 2.1× as long as body (282:135).

Color: Body black, scapus brown; antenna brown, but yellowish brown basally, with antennal segments 13–26 cream white; palpi pale yellow, but first segments brownish yellow; fore- and middle legs yellow; hind coxa brown; hind trochanters and trochantellus yellow; hind femur yellow basally and brown apically; hind tibia yellow, but infuscate apically; hind tarsus whitish yellow; pterostigma and wing veins brown; wing membrane hyaline.

Male: Unknown.

Etymology: From elongatus (Latin for “prolonged”), because of the elongate second metasomal tergite and the long ovipositor.

Type Material: Holotype, ♀, “Hel.040” (IEBR), NC Vietnam: Ha Tinh, Huong Son, 18°22′N 106°13′E, 450 m, April 7–13, 1998, Malaise [trap], AMNH, K. Long. Paratypes: 4♀: “Hel.041” (AMNH), same place, but 900 m, May 5, 1998, Malaise [trap], AMNH, K. Long; “Hel.038” (AMNH), Ha Tinh, Huong Son, 18°22′N 106°13′E, 600 m, April 15–20, 1998, Malaise [trap], AMNH, K. Long; “Hel.066” (IEBR), same place, but 900 m, April 15–20, 1998, Malaise [trap], AMNH, K. Long; “Hel.027” (IEBR), NC Vietnam: Ha Tinh, Huong Son, 18°22′N 106°13′E, 900 m, April 20–28, 1998, Malaise [trap], AMNH, K. Long; 2♂: “Hel.070” (AMNH), same place, but May 18, 1998, Malaise [trap], AMNH, K. Long; “Hel.079” (IEBR), same place, but May 20, 1998, Malaise [trap], AMNH, K. Long; 2♀, “Hel.025” (VNMN), NE Vietnam: Tuyen Quang, Na Hang, Trung Phin, sweeping, 18.ix.2017, HTHCT; “Hel.001” (RMNH), NW Vietnam: Hoa Binh, Cuc Phuong NP, M[alaise] T[rap], 20°23′06″N 105°34′11″E, 315 m, 20–30.vi.2002, K.D. Long.

Distribution: NC Vietnam: Ha Tinh (Huong Son); NE Vietnam: Tuyen Quang (Na Hang NP); NW Vietnam: Hoa Binh (Cuc Phuong NP).

Biology: Unknown.

Diagnosis: Females have antenna with 34–37 segments and antennal segments 10–22 cream white; males have antenna with 38–39 segments and antennal segments 10–27 cream white; maxillary palp 1.9× as long as head; malar space 0.9× as long as mandible width and 0.35× height of eye; frontal protuberance bifurcate, broader apically, as high as lateral frontal carina; in dorsal view width of head 1.3× its median length; height of eye 2.0× as long as temple; in lateral view width of eye 1.6× as long as temple. Mesosoma 2.1× longer than high; notauli crenulate anteriorly, fused posteriorly with median carina in wide and coarsely rugose area; scutellum sparsely punctate; propodeum with distinct areola and coarsely rugose. Length of forewing 3.2× its maximum width; pterostigma 3.7× as long as wide; vein 3-SR shorter vein r; vein 2-M 3.1× 3-SR; hind wing: vein 1-M 0.5× vein 1r-m; vein 2-SC+R short, nearly quadrate, hind wing with 4 hamuli. Foretarsus 1.4× as long as foretibia; hind femur with ventral serrations and acute tooth-shaped protuberance; length of hind femur (without tooth or serrations) 3.7× its maximum width; hind coxa densely punctate laterally; hind femur largely rugose-punctate. First metasomal tergite as long as its apical width; dorsal carinae in basal 0.7 of tergite; first tergite smooth medially, sparsely rugose basally and laterally, transversely rugose apically; median length of second tergite 0.35× its basal width; median length of second tergite 0.8× third tergite; second tergite largely smooth, but with faint divergent striae baso-laterally; third tergite largely smooth.

Notes: W. hatinhensis, sp. nov., runs to couplet 16a of the key by Yan et al. (2017), but differs from all species after couplet 16 by the following characters: (1) in dorsal view length of eye 2× as long as temple; (2) second metasomal tergite with divergent striae baso-laterally (fig. 55); (3) hind coxa pale yellow and hind femur brown (except pale yellow base of latter) and (4) antennal segments 10–22 cream white.

Description: Holotype, ♀, body length 8.7 mm, forewing length 8.1 mm, ovipositor sheath 5.3 mm (fig. 48).

Head: Antenna with 36 segments; third antennal segment 1.05× fourth segment (20:19); frontal protuberance bifurcate, broader apically, as high as lateral frontal carina; in frontal view height of eye 2.1× its transverse width (42:20); width of face 1.8× length of face and clypeus combined (49:27); malar space 0.9× as long as mandible width (15:17) and 0.35× height of eye (15:42) (fig. 50); maxillary palp 1.9× as long as head (68:35); in dorsal view width of head 1.3× as long as its median length (85:64); height of eye 2.0× as long as temple (36:18); ocelli in high triangle, POL:OD:OOL = 7:6:18; distance between front and hind ocelli 0.2× as long as OOL (4:18) (fig. 49); in lateral view length of eye 1.5× its transverse width (50:33); width of eye 1.2× temple (33:27) (fig. 51); face coarsely rugose, narrow area between antennal sockets and eye margin crenulate; clypeus rugose; malar space coarsely rugose; frons smooth; vertex and temple almost smooth, with scattered fine punctures.

Mesosoma: Mesosoma 2.1× longer than high (87:41); pronotal side coarsely carinate medially, rugose-punctate dorsally and largely rugose ventrally (fig. 53); mesopleuron narrowly depressed and smooth medially, sparsely punctate dorsally, punctate-reticulate ventrally; metapleuron foveate-reticulate; median lobes of mesoscutum sparsely punctate, but posteriorly near notauli largely rugose; lateral lobes of mesoscutum almost smooth; notauli crenulate anteriorly, fused posteriorly with median carina in wide coarsely rugose area (fig. 52); scutellar sulcus with 3 carinae, 0.5× scutellum (12:23); scutellum sparsely punctate; propodeum with distinct areola and coarsely rugose (fig. 56).

Wings. Forewing: length of forewing 3.2× its maximum width (81:25); pterostigma 3.7× as long as wide (56:15); vein r arising behind middle of pterostigma (fig. 57); vein 3-SR shorter vein r; r:2-SR:3-SR:SR1:r-m = 16:27:13:87:15; 1-CU1:cu-a:2-CU1 = 5:17:27;, vein 2-M 3.1× 3-SR (40:13). Hind wing: vein 1-M 0.5× vein 1r-m (12:24) (fig. 58); vein 2-SC+R short, nearly quadrate; hind wing with 4 hamuli.

Legs: Foretarsus 1.4× longer than foretibia (51:36); hind femur with ventral serrations and acute tooth-shaped protuberance (fig. 54); length of hind femur (without tooth or serrations), tibia, and basitarsus 3.7 (88:24), 9.8 (137:14) and 7.3× (44:6) as long as their maximum width, respectively; hind coxa densely punctate laterally; hind femur largely rugose-punctate (fig. 54); hind basitarsus 0.3× hind tibia (44:137), and 0.8× as long as second–fifth hind tarsal segments (44:58); fourth hind tarsal segment 0.6× as long as telotarsus (8:14).

Metasoma: Metasoma 0.7× as long as head and mesosoma combined (44:61); first tergite as long as its apical width (37:37) (fig. 55); dorsal carinae in basal 0.7 of tergite (22:33); first tergite smooth medially, sparsely rugose basally and laterally, transversely rugose apically; median length of second tergite 0.35× its basal width (14:40); and 0.8× third (14:17) (fig. 55); second tergite largely smooth, with faint divergent striae baso-laterally; second suture distinct; third tergite and remainder of metasoma largely smooth; ovipositor sheath 0.65× as long as forewing (53:81).

Color: Body dark brown, scapus light brown; antenna brown, light brown basally with 11th–22nd antennal segments cream white; palpi pale yellow; foreleg pale yellow, but tibia yellow; hind coxa, trochanter and trochantellus yellow; hind femur largely brown, but yellow basally; hind tibia yellow basally, brown apically; hind tarsus whitish yellow; pterostigma and wing veins brown; wing membrane hyaline; first and second metasomal tergites brown; tergites 3–6 light brown; ovipositor sheath brown.

Etymology: The new species named after the type locality (Ha Tinh province) in north-central Vietnam.

Variation: Paratype ♀, “Hel.027,” body length 9.5 mm, forewing length 7.3 mm, ovipositor sheath 4.7 mm. Female antenna with 34–37 segments, 10th–22nd antennal segments cream white; male antenna with 38–39 segments; 10th–27th antennal segments cream white.

Type Material: Holotype, ♀, “Hel.002” (IEBR), NW Vietnam: Phu Tho, Xuan Son NP, xom Lap, 9.v.2005, PT Nhi.

Distribution: NW Vietnam: Phu Tho (Xuan Son NP).

Biology: Unknown.

Diagnosis: Antenna with 42 segments; 14th–22nd antennal segments cream white; frontal protuberance lamelliform, blunt apically; maxillary palp long, 1.7× height of head; malar space 0.4× height of eye; in dorsal view width of head 1.35× its median length; height of eye 1.2× temple; in lateral view height of eye 1.75× its transverse width; transverse width of eye 0.95× temple. Mesosoma 2.3× longer than high; notauli narrow, crenulated anteriorly, rugose posteriorly, divided by median posterior carina; scutellar sulcus 0.4× scutellum; propodeum with basal carina and areola; propodeum rugose-punctate. Length of forewing 3.5× its maximum width; vein 3-SR 1.45× vein r; vein 2-M 1.9× 3-SR; hind wing vein 1-M 0.6× vein 1r-m; hind wing with 4 hamuli. Foretarsus 1.4× longer than foretibia; hind femur only with serrations; hind coxa sparsely punctate; hind femur largely rugose-punctate; length of hind femur (without serrations) 4.35× its maximum width. First metasomal tergite 2.0× longer than its apical width; dorsal carinae in basal 0.75 of tergite; first tergite smooth basally and apically; mediolateral and median area between dorsal carinae of first tergite sparsely foveolate-punctate; median length of second tergite 0.8× its basal width; second tergite 1.2× third tergite; second and third tergites shiny and smooth.

Notes: W. laevis, sp. nov., is similar to W. eurygenys Yan and Chen, 2017, from China according to the key by Yan et al. (2017), but differs as follows: (1) first metasomal tergite 2× as long as its apical width (1.4× in W. eurygenys); (2) scapus densely setose ventrally (scapus with few medium-sized setae in W. eurygenys); (3) ovipositor sheath 1.5× longer than forewing (as long as forewing in W. eurygenys) and (4) antennal segments 14–22 cream white (13th–18th in W. eurygenys).

Description: Holotype, ♀, body length 8.4 mm, forewing length 8.0 mm, ovipositor sheath 12.0 mm (fig. 59).

Head: Antenna with 42 segments; third antennal segment nearly as long as fourth (19:17); in frontal view height of eye 2.0× its transverse width (34:17); width of face 1.5× length of face and clypeus combined (40:27); clypeus narrow; malar space as long as mandible width (15:15) and 0.4× height of eye (15:34) (fig. 61); maxillary palp long, 1.7× height of head (106:61); in dorsal view width of head 1.35× its median length (72:53); height of eye 1.2× temple (26:22); ocelli in rather low triangle, POL:OD:OOL =7:5:16 (fig. 60); distance between front and hind ocelli 0.2× OOL (3:16) (fig. 60); frontal protuberance lamelliform, blunt apically (fig. 65); in lateral view height of eye 1.75× its transverse width (35:20); transverse width of eye 0.95× temple (20:21) (fig. 62); face coarsely rugose; frons rugose-coriaceous anteriorly and smooth posteriorly; vertex and temple smooth.

Mesosoma: Mesosoma 2.3× longer than high (82:36); pronotal side crenulated anteriorly, finely punctate dorsally, coarsely rugose ventrally and posteriorly; mesopleuron almost flat, smooth; metapleuron areolate-rugulose (fig. 64); lobes of mesoscutum almost smooth, with scattered fine punctures; notauli narrow, crenulated anteriorly, rugose posteriorly, divided by median posterior carina (fig. 63); scutellar sulcus narrow, with one carinae, 0.4× scutellum (8:22); scutellum almost smooth; propodeum with basal carina and long areola (fig. 67); propodeum rugose-punctate.

Wings: Forewing: length of forewing 3.5× its maximum width (98:28); pterostigma 4.0× as long as wide (48:12); vein 3-SR 1.45× vein r; r:2-SR:3-SR:SR1:r-m = 11:18:16:87:13; 1-CU1:cu-a:2-CU1 = 3:16:30; 1-M:r-m = 31:14 (fig. 69); vein 2-M 1.9× 3-SR (31:16). Hind wing: vein 1-M 0.6× vein 1r-m (14:24) (fig. 70); hind wing with 4 hamuli.

Legs: Foretarsus 1.4× longer than foretibia (58:42); hind femur only with serrations (fig. 67); hind coxa sparsely punctate; hind femur largely rugose-punctate (fig. 66); length of hind femur (without serrations), tibia, and basitarsus 4.35 (74:17), 10.6 (106:10), and 9.25× (37:4) as long as their maximum width, respectively; hind basitarsus 0.3× hind tibia (37:106), and 0.7× hind tarsal segments 2–5 (37:56); fourth hind tarsal segment 0.4× as long as telotarsus (6:14).

Metasoma: Metasoma 0.7× as long as head and mesosoma combined (35:49); first tergite 2.0× longer than its apical width (55:27) (fig. 68); dorsal carinae in basal 0.75 of tergite (41:55); first tergite smooth basally and apically; mediolateral and median area between dorsal carinae of first tergite sparsely foveolate-punctate (fig. 68); median length of second tergite 0.8× its basal width (24:31), and 1.2× third tergite (24:20); second and third tergites shiny and smooth; ovipositor sheath 1.5× as long as forewing (120:80).

Color: Body yellowish brown, scapus brown; antenna brownish yellow basally, with antennal segments 14–22 cream white; palpi yellow; fore- and middle legs yellow; hind leg yellow, with apical third of hind femur and tibia apically infuscate; pterostigma and wing veins brown; wing membrane yellow; metasoma reddish brown; ovipositor sheath dark brown.

Male: Unknown.

Etymology: From laevis (Latin for “smooth, polished”), because of the highly polished mesoscutum.

Type Material: Holotype, ♀, “Hel.003” (IEBR), NW Vietnam: Son La, Thuan Chau, Copia NR, 1200 m, 5.vi.2008, L.X. Hue.

Distribution: NW Vietnam: Son La (Thuan Chau).

Biology: Unknown.

Diagnosis: Antenna with 31 segments; antennal segments 3–19 pale yellow; maxillary palp 1.75× as long as head; in frontal view width of face 1.8× length of face and clypeus combined; frontal protuberance robust, higher than lateral frontal carina; in dorsal view width of head 1.5× its median length; height of eye 1.9× temple; in lateral view height of eye 1.3× its transverse width; transverse width of eye 1.7× temple; face coarsely rugose; frons, vertex, and temple mat. Mesosoma 2.3× as long as high; notauli narrow, sparsely crenulate, fused posteriorly with median carina in rather flat posterior area of mesoscutum; scutellar sulcus 0.5× as long as scutellum; propodeum with basal carina and areola; propodeal areola mat; propodeum transversely rugose laterally. Length of forewing 3.3× its maximum width; vein 3-SR 1.45× as long as vein r; vein 2-M 2.1× 3-SR; hind wing vein 1-M 0.7× vein 1r-m; vein 2-SC+R transverse, 0.2× vein 1r-m. Foretarsus 1.65× as long as foretibia; hind femur with ventral serrations and acute tooth-shaped protuberance; hind femur (without tooth or serrations) 3.8× as long as its maximum width and rugose-punctate. First metasomal tergite 1.8× its apical width; dorsal carinae in basal 0.6 of tergite; first tergite largely smooth, except sparsely punctate-reticulate medioapical area; median length of second tergite 0.9× its apical width, and 1.25× third tergite; second and third tergites smooth.

Notes: W. plana, sp. nov., runs to W. eurygenys Yan and Chen, 2017, from China in the key by Yan et al. (2017), but differs as follows: (1) in dorsal view length of eye 1.9× as long as temple (1.2× in W. eurygenys); (2) first metasomal tergite 1.8× as long as its apical width (1.4× in W. eurygenys); and (3) hind coxa and femur yellow and only infuscate apically (reddish brown in W. eurygenys).

Description: Holotype, ♀, body length 7.8 mm, forewing length 7.3 mm, ovipositor sheath 7.7 mm (fig. 71).

Head: Antenna with 31 segments; third antennal segment 1.1× fourth segment (15:14); maxillary palp 1.75× as long as head (51:29); in frontal view height of eye 2.1× its transverse width (23:11); width of face 1.8× length of face and clypeus combined (29:16) (fig. 73); malar space 0.9× as long as mandible width (10:11) and 0.3× height of eye (10:34); frontal protuberance robust, higher than lateral frontal carina (fig. 74); in dorsal view width of head 1.5× as long as median length (67:44); height of eye 1.9× temple (27:14); POL:OD:OOL = 7:6:13; distance between front and hind ocelli 0.4× OOL (5:13) (fig.); in lateral view height of eye 1.3× as long as transverse width (34:26); transverse width of eye 1.7× as long as temple (26:15) (fig. 74); face coarsely rugose; frons, vertex, and temple mat.

Mesosoma: Mesosoma 2.3× longer than high (95:42); pronotal side crenulate anteriorly, largely rugose ventrally and posteriorly, punctate dorsally; mesopleuron flat, mat (fig. 76); metapleuron areolate-rugulose anteriorly, coarsely rugose posteriorly; mesoscutum with sparse punctures; notauli narrow, sparsely crenulate, fused posteriorly with median carina in rather flat area of mesoscutum (fig. 75); scutellar sulcus with 3+ carinae, 0.5× as long as scutellum (8:17); scutellum sparsely punctate; propodeum with basal carina and areola; propodeal areola smooth medially, rugose-punctate laterally (fig. 78); propodeum transversely rugose laterally (fig. 78).

Wings. Forewing: length of forewing 3.3× its maximum width (118:36); pterostigma 3.8× as long as wide (50:13); vein 3-SR 1.45× as long as vein r; r:2-SR:3-SR:SR1:r-m = 11:20:16:90; 1-CU1:cu-a:2-CU1 = 4:14:27; second submarginal cell trapezium shaped, vein 2-M 2.1× 3-SR (33:16) (fig. 77); hind wing: vein 1-M 0.7× 1r-m (17:23); vein 2-SC+R transverse, 0.2× vein 1r-m (5:23); hind wing with 4 hamuli.

Legs: Foretarsus 1.65× longer than foretibia (43:26); hind femur with ventral serrations and acute tooth-shaped protuberance (fig. 79); length of hind femur (without tooth or serrations) 3.8× as long as its maximum width and rugose-punctate; hind coxa sparsely finely punctate laterally; hind tibia slightly curved basally (fig. 80); hind femur, tibia, and basitarsus 3.8 (79:21), 9.2 (110:12), and 6.3× (38:6) as long as their width, respectively; hind basitarsus 0.35× as long as hind tibia (38:110) and 0.7× as long as hind tarsal segments 2–5 (38:52); fourth hind tarsal segment 0.3× as long as telotarsus (5:17).

Metasoma: Metasoma 0.75× as long as head and mesosoma combined (53:70); first tergite 1.8× longer than its apical width (57:32); first tergite largely smooth, except sparsely punctate-reticulate medioapical area; dorsal carinae in basal 0.6 of tergite (32:57) (fig. 81); median length of second tergite 0.9× its apical width (30:33), and 1.25× third tergite (30:24); second and third tergites smooth; ovipositor sheath 1.1× as long as forewing (77:73).

Color: Body black; scapus brown; antenna brown, with 13th–19th antennal segments pale yellow; palpi yellow; fore- and middle leg yellow; hind leg yellow, except hind femur and tibia apically brown; hind tarsus pale yellow; pterostigma and wing veins brown; wing membrane yellow; metasomal tergites and ovipositor sheath brown.

Male: Unknown.

Etymology: From planus (Latin for “even, flat”), because of the flat mesopleuron.

Type Material: Holotype, ♀, “Hel.009” (IEBR), C Vietnam: Thua Thien-Hue, A Luoi, A Roang, 600–900 m, 29.v.2006, H.V. Tru.

Distribution: C Vietnam: Thua Thien-Hue.

Biology: Unknown.

Diagnosis: Antenna with 41 segments; antennal segments 12–23 cream white; maxillary palp 1.7× as long as head; in frontal view width of face 1.8× length of face and clypeus combined; frontal protuberance with distinct ledge halfway and blunt dorsally; in dorsal view width of head 1.4× its median length; height of eye 1.5× as long as temple; in lateral view height of eye 1.4× as long as its transverse width; transverse width of eye 1.4× temple. Mesosoma 2.4× as long as high; notauli crenulated anteriorly, fused with coarsely rugose area posteriorly; scutellar sulcus 0.5× as long as scutellum; propodeum with basal median carinae and narrow areola; propodeum almost areolate-rugulose. Length of forewing 3.5× its maximum width; vein 3-SR 2.0× vein r; vein 2-M 2.0× as long as vein 3-SR; hind wing vein 1-M 0.5× vein 1r-m; vein 2-SC+R long, 0.3× as long as vein 1r-m; hind wing with 5 hamuli. Foretarsus 1.5× longer than foretibia; hind femur with ventral serrations and stout protuberance; length of hind femur (without protuberance or serrations) 4.4× its maximum width; hind coxa sparsely punctate; hind femur largely rugose-punctate. First metasomal tergite 1.8× as long as its apical width; dorsal carinae in basal 0.6 of tergite; first tergite smooth basally and apically, punctate laterally, punctate-reticulate medially between dorsal carinae; median length of second tergite 0.7× its basal width, and as long as third tergite; second suture distinct; second tergite smooth with sparse punctures laterobasally; third tergite smooth.

Notes: W. similis, sp. nov., runs to W. eurygenys Yan and Chen, 2017, from China in couplet 3b of the key by Yan et al. (2017), but differs as follows: (1) first metasomal tergite 1.8× as long as apical width (1.4× in W. eurygenys); (2) scapus densely setose ventrally (scapus with few medium-sized setae in W. eurygenys); (3) vein r of forewing 0.5× vein 3-SR (0.8× in W. eurygenys); (4) vein 1-M of hind wing 0.5× vein 1r-m (0.7× in W. eurygenys) and (5) antennal segments 12–23 cream white (13–18 in W. eurygenys).

Description: Holotype, ♀, body length 11.0 mm, forewing length 9.5 mm, ovipositor sheath 13.0 mm (fig. 82).

Head: Antenna with 41 segments; third antennal segment as long as fourth segment (18:18); maxillary palp 1.7× as long as head (54:32); in frontal view height of eye 1.9× its transverse width (40:21); width of face 1.8× length of face and clypeus combined (48:26) (fig. 84); malar space 0.8× as long as mandible width (14:17) and 0.3× height of eye (14:41); frontal protuberance with distinct ledge halfway and blunt dorsally, higher than lateral frontal carina; in dorsal view width of head 1.4× its median length (83:61); height of eye 1.5× as long as temple (32:21); ocelli in rather low triangle, POL:OD:OOL = 9:7:19 (fig. 83); distance between front and hind ocelli 0.3× as long as OOL (6:19) (fig. 83); in lateral view height of eye 1.4× its transverse width (38:27); transverse width of eye 1.35× as long as temple (27:20) (fig. 85); face coarsely rugose; frons, vertex, and temple smooth.

Mesosoma: Mesosoma 2.4× longer than high (97:40); pronotal side crenulate anteriorly, punctate dorsally, coarsely rugose ventrally and posteriorly; mesopleuron largely smooth medially; sparsely punctate dorsally and ventrally (fig. 87); metapleuron coarsely rugose; lobes of mesoscutum smooth; notauli crenulated anteriorly, fused posteriorly with coarsely rugose area (fig. 86); scutellar sulcus rugose, with 4 carinae, 0.5× as long as scutellum (12:23); scutellum sparsely punctate; propodeum with basal median carinae and without areola (fig. 89); propodeum largely areolate-rugulose.

Wings: Forewing: length of forewing 3.5× its maximum width (139:40); pterostigma 3.6× as long as wide (61:17); vein 3-SR 2.0× as long as vein r; r:2-SR:3-SR:SR1:r-m = 9:20:18:87; 1-CU1:cu-a:2-CU1 = 4:13:24; vein 2-M 2.0× as long as vein 3-SR (53:27) (fig. 91); hind wing: vein 1-M 0.5× vein 1r-m (15:29); vein 2-SC+R long, 0.3× vein 1r-m (8:29); hind wing with 5 hamuli.

Legs: Foretarsus 1.5× longer than foretibia (53:36); hind femur with ventral serrations and stout protuberance (fig. 88); length of hind femur (without protuberance or serrations), tibia, and basitarsus 4.4 (88:20), 11.5 (126:11), and 8.6× (43:5) as long as their maximum width, respectively; hind coxa sparsely punctate; hind femur largely rugose-punctate (fig. 88); hind basitarsus 0.3× hind tibia (43:126), and 0.7× as long as hind tarsal segments 2–5 (43:58); fourth hind tarsal segment 0.4× telotarsus (6:14).

Metasoma: Metasoma 0.8× as long as head and mesosoma combined (55:67); first tergite 1.8× as long as its apical width (64:35) (fig. 90); dorsal carinae in basal 0.6 of tergite (36:61); first tergite smooth basally and apically, punctate laterally, punctate-reticulate medially between dorsal carinae (fig. 90); median length of second tergite 0.7× its basal width (26:39) and as long as third tergite (26:26); second suture distinct; second tergite smooth with sparse punctation laterobasally; third tergite smooth; ovipositor sheath 1.4× as long as forewing (130:95).

Color: Body dark brown, scapus brown; antenna brown, with antennal segments 12–23 cream white; palpi yellow; fore- and middle leg yellow, except tarsus pale yellow; hind leg yellow, but hind femur and tibia apically infuscate; hind tarsus whitish yellow; pterostigma and wing veins brown; wing membrane hyaline; first metasomal tergite yellow; tergites 2–6 brown; ovipositor sheath brown.

Male: Unknown.

Etymology: From similis (Latin for “like, resembling”), because this new species similar to Wroughtonia eurygenys Yan and Chen, 2017, from China.

Type Material: Holotype, ♀, “Hel.064” (IEBR), NC Vietnam: Ha Tinh, Huong Son, 18°22′N 106°13′E, 450 m, May 5, 1998, Malaise trap, AMNH, K. Long.

Distribution: NC Vietnam: Ha Tinh (Huong Son).

Biology: Unknown.

Diagnosis: Antenna with 36 segments; antennal segments 11–18 cream white; maxillary palp 1.45× as long as head; in frontal view width of face 1.7× length of face and clypeus combined; frontal protuberance lamelliform and without ledge halfway; in dorsal view width of head 1.9× as long as median length; height of eye 1.7× temple; in lateral view height of eye 1.3× its transverse width; transverse width of eye 1.6× temple. Mesosoma 1.9× longer than high; notauli wide and shallow, coarsely rugose; scutellar sulcus wide, 0.6× scutellum; scutellum rugose-punctate; propodeum with basal carina, areolate-rugose. Length of forewing 3.0× its maximum width; vein 3-SR 0.9× as long as vein r; vein 2-M 2.0× as long as vein 3-SR; hind wing vein 1-M 0.4× vein 1r-m; hind wing with 3 hamuli. Foretarsus 1.65× foretibia; hind femur only with serrations; length of hind femur (without serrations) 3.3× as long as its maximum width; outer side of hind coxa finely punctate; hind femur punctate laterally. First metasomal tergite 1.3× as long as its apical width; dorsal carinae in basal 0.8 of tergite; first tergite almost smooth basally, foveolate-rugulose medially and apically; median length of second tergite 0.6× its basal width, and 1.2× third tergite; second tergite rugose medially, rugose-punctate laterally; third tergite smooth.

Notes: W. simulata, sp. nov., runs to W. zhejiangensis Yan and van Achterberg, 2017, from China in couplet 10a of the key by Yan et al. (2017), but differs as follows: (1) frontal protuberance narrowed from base to apex, blunt apically (with posterior protruding narrow lamella in W. zhejiangensis); (2) foretarsus 1.65× as long as foretibia (1.1× in W. zhejiangensis); (3) first metasomal tergite 1.3× as long as apical width (1.1× in W. zhejiangensis) and (4) antenna with 8 (11th–18th) cream white segments (6 [13th–18th] in W. zhejiangensis).

The new species is also similar to W. albobasalis van Achterberg and Chen, 2017, from China, but differs as follows: (1) frontal protuberance acute (triangular in W. albobasalis); (2) hind femur more slender, 3.5× longer than its maximum width (2.8× in W. albobasalis); (3) vein 1-M of hind wing 0.7× vein 1r-m (0.4× in W. albobasalis); and (4) antenna dark brown with segments 11–20 cream white (3rd–11th in W. albobasalis).

Description: Holotype, ♀, body length 7.1 mm, forewing length 5.3 mm, ovipositor sheath 5.6 mm (fig. 92).

Head: Antenna with 36 segments; third antennal segment slightly longer than fourth segment (15:12); in frontal view height of eye 1.9× its transverse width (28:15); width of face 1.7× length of face and clypeus combined (38:22); clypeus wide; malar space 1.3× as long as mandible width (13:10) and 0.5× height of eye (13:28) (fig. 94); maxillary palp 1.45× as long as head (67:46); frontal protuberance lamelliform, without ledge halfway; in dorsal view width of head 1.9× as long as its median length (65:34); height of eye 1.7× as long as temple (22:13); ocelli in rather low triangle, POL:OD:OOL = 8:4:12 (fig. 93); distance between front and hind ocelli 0.3× as long as OOL (4:12) (fig. 93); in lateral view height of eye 1.3× its transverse width (28:22); transverse width of eye 1.6× temple (22:14) (fig. 95); face longitudinally rugose; frons rugose; vertex and temple dorsally smooth; temple ventrally rugose.

Mesosoma: Mesosoma 1.9× longer than high (90:47); pronotal side largely crenulate medially, coarsely rugose dorsally and ventrally; mesopleuron shiny, smooth medially; rugose-punctate ventrally; metapleuron areolate-rugulose (fig. 97); median lobes of mesoscutum coriaceous anteriorly and rugose posteriorly; notauli wide and shallow, coarsely rugose (fig. 96); lateral lobes of mesoscutum rugose-punctate; scutellar sulcus wide, with three carinae, 0.6× as long as scutellum (9:16); scutellum rugose-punctate; propodeum with basal carina and areolate-rugose (fig. 98).

Wings: Forewing: length of forewing 3.0× its maximum width (125:41); pterostigma 3.1× as long as wide (40:13); vein 3-SR 0.9× as long as vein r; r:2-SR:3-SR:SR1:r-m = 10:14:9:68; 1-CU1:cu-a:2-CU1 = 3:12:21; 1-M 2.2× vein m-cu (26:12); vein 2-M almost 2.0× as long as vein 3-SR (22:9) (fig. 102); hind wing vein 1-M 0.4× vein 1r-m (11:27); hind wing with 3 hamuli.

Legs: Foretarsus 1.65× longer than foretibia (43:36); hind femur only with serrations (fig. 101); length of hind femur (without serrations), tibia, and basitarsus 3.3 (60:18), 10.2 (82:8), and 6.25× (25:4) as long as their maximum width, respectively; hind basitarsus 0.3× as long as hind tibia (25:82) (fig. 103), and 0.75× as long as hind tarsal segments 2–5 (25:33); fourth hind tarsal segment 0.4× as long as telotarsus (4:11); hind coxa finely punctate laterally (fig. 99); hind femur punctate laterally (fig. 101).

Metasoma: Metasoma subequal to head and mesosoma combined (35:36); first tergite 1.3× longer than its apical width (58:46) (fig. 100); dorsal carinae in basal 0.8 of tergite (48:58); first tergite largely smooth basally, foveolate-rugulose medially and apically (fig. 100); median length of second tergite 0.6× its basal width (28:48), and 1.2× third tergite (28:23); second tergite rugose medially, rugose-punctate laterally; third tergite smooth; ovipositor sheath 1.1× as long as forewing (56:53).

Color: Head and mesosoma dark brown to black; scapus brown; antenna brown, but with 11th–18th antennal segments cream white; palpi yellow; fore- and middle legs light yellow; hind leg yellow, hind femur yellow, but apical two thirds of hind femur and extreme apex of hind tibia infuscate; pterostigma and wing veins brown; wing membrane yellow; metasoma brown; ovipositor sheath dark brown.

Male: Unknown.

Etymology: From simulatus (Latin for “imitated, copied because this species is similar to two species (Wroughtonia albobasalis van Achterberg and Chen and W. zhejiangensis Yan and van Achterberg) from China.

Type Material: Holotype, ♀, “Hel.057” (IEBR), NW Vietnam: Son La, coffee orchard, MT, 21°18′06″N 103°55′36″E, 663 m, but 10.v.2017, K.D. Long. Paratypes: 4♀, “Hel.023” (IEBR), NW Vietnam: Son La, MT, 21°18′03″N 103°55′38″E, 671 m, 25.iv-5.v.2016, K.D. Long; “Hel.054” (IEBR), “Hel.055” (AMNH), “Hel.056” (RMNH), NW Vietnam: Son La, coffee orchard, MT, 21°18′06″N 103°55′36″E, 663 m, 01.v.2017, K.D. Long.

Distribution: NW Vietnam: Son La.

Biology: Unknown.

Diagnosis: Antenna with 34–36 segments; antennal segments 10–18 cream white; maxillary palp 1.3× as long as head (74:52); in frontal view height of eye 2× its transverse width; width of face 2.0× length of face and clypeus combined; malar space 0.5× height of eye; frontal protuberance lamelliform, not pointed apically; in dorsal view width of head 1.5× longer than its median length; height of eye 1.7× temple; in lateral view height of eye 1.4× its transverse width; transverse width of eye 1.4× temple; face largely rugose; frons, vertex, and temple smooth. Mesosoma 2.05× longer than high; notauli narrow and deep, crenulated anteriorly, punctate-reticulate posteriorly; scutellar sulcus wide and shallow, 0.6× scutellum; scutellum largely smooth; propodeum with large foveolate areola and transversely rugose laterally. Length of forewing 3.4× its maximum width; vein 3-SR 1.1× as long as vein r; vein 1-M 1.9× vein m-cu; vein 2-M 2.2× 3-SR; hind wing vein 1-M 0.75× vein 1r-m; hind wing with 3 hamuli. Foretarsus 1.5× as long as foretibia; hind femur only with ventral serrations; length of hind femur (without serrations) 3.7× its maximum width; hind coxa sparsely punctate; hind femur largely rugose-punctate. First metasomal tergite about as long as its apical width; dorsal carinae in basal 0.4 of tergite; first tergite foveolate-reticulate; median length of second tergite 0.5× its basal width, and as long as third tergite; second tergite punctate-reticulate; third tergite smooth.

Notes: W. sonla, sp. nov., runs to W. brevicarinata (Yan and Chen, 2014) (couplet 14b) in the key by Yan et al. (2017), but differs as follows: (1) hind femur slenderer, length of hind femur 3.7× as long as its maximum width (without serrations) (3.3× in W. brevicarinata); (2) vein r of forewing distinctly shorter vein 3-SR (vein r 1.3× 3-SR× in W. brevicarinata); and (3) antenna dark brown with segments 11–18 cream white (9–21 in W. brevicarinata).

Description: Holotype, ♀, body length 7.5 mm, forewing length 6.1 mm, ovipositor sheath 5.5 mm (fig. 104).

Head: Antenna with 35 segments; third antennal segment as long as fourth segment (16:12); maxillary palp 1.3× as long as head (74:52); in frontal view height of eye 2.0× its transverse width (30:15); width of face 2.0× length of face and clypeus combined (44:22) (fig. 106); malar space 1.3× as long as mandible width (14:11) and 0.5× height of eye (14:30); clypeus wide; frontal protuberance lamelliform, not pointed apically; in dorsal view width of head 1.5× its median length (70:46); height of eye 1.7× as long as temple (25:15); ocelli in rather low triangle, POL:OD:OOL = 10:5:15 (fig. 105); distance between front and hind ocelli 0.3× as long as OOL (4:15) (fig. 105); in lateral view height of eye 1.4× its transverse width (31:22); transverse width of eye 1.4× as long as temple (22:16) (fig. 107); face largely rugose; frons, vertex, and temple smooth.

Mesosoma: Mesosoma 2.05× longer than high (82:40) (fig. 109); pronotal side crenulated medially, rugose dorsally and ventrally; mesopleuron largely smooth medially; subalar space rugose-punctate; metapleuron areolate-rugulose; lobes of mesoscutum shiny, smooth; notauli narrow and deep, crenulated anteriorly, punctate-reticulate posteriorly (fig. 108); scutellar sulcus wide and shallow, with three carinae, 0.6× as long as scutellum (10:16); scutellum largely smooth; propodeum with large areola, areola foveolate; propodeum transversely rugose laterally (fig. 110).

Wings. Forewing: length of forewing 3.4× its maximum width (115:34); pterostigma 3.3× as long as wide (40:12); vein 3-SR 1.1× as long as vein r; r:2-SR:3-SR:SR1:r-m = 9:14:10:61; 1-CU1:cu-a:2-CU1 = 3:12:20; vein 1-M almost straight, 1.9× vein m-cu (23:12) (fig. 114); vein 2-M 2.2× 3-SR (22:10); hind wing vein 1-M 0.75× vein 1r-m (12:16) (fig. 115); hind wing with 3 hamuli.

Legs: Foretarsus 1.5× longer than foretibia (60:41); hind femur with ventral serrations, without tooth-shaped protuberance (fig. 111); hind coxa sparsely punctate; hind femur largely rugose-punctate (fig. 111); length of hind femur (without serrations), tibia, and basitarsus 3.7 (67:18), 9.7 (97:10) and 6.2× (31:5) as long as their maximum width, respectively; hind basitarsus 0.3× as long as hind tibia (31:97), and 0.7× as long as second–fifth hind tarsal segments (31:45); fourth hind tarsal segment 0.5× as long as telotarsus (6:13).

Metasoma: Metasoma 0.7× as long as head and mesosoma combined (31:44); first tergite about as long as its apical width (55:53) (fig. 112); dorsal carinae in basal 0.4 of tergite (20:55); first tergite foveolate-reticulate (fig.); median length of second tergite 0.5× its basal width (27:54), and as long as third tergite (27:27); second tergite punctate-reticulate; third tergite smooth; ovipositor sheath 0.9× as long as forewing (55:61).

Color: Body black, scapus black; antenna yellowish brown basally, with antennal segments 11–18 cream white; palpi whitish yellow; fore- and middle legs yellow, but fore- and middle tarsi whitish yellow; hind leg yellow, hind coxa and femur reddish yellow, but apical one fourth of hind femur blackish brown; hind tibia brown, but basal third whitish yellow; hind tarsal segments 1–4 whitish yellow; hind telotarsus infuscate; pterostigma and wing veins brown; wing membrane yellow; first metasomal tergite pale yellow; tergites 2–6 black; ovipositor sheath brown.

Male: Unknown.

Etymology: Named after the province of the type locality (Son La province) in northwest Vietnam.

Variation: Female antenna with 34–36 segments, with segments 10–17 cream white; body length 6.0–7.8 mm; forewing 5.0–6.5 mm; ovipositor sheath 5.0–6.0 mm; hind wing with 3 hamuli.

Type Material: Holotype, ♀, “Hel.065” (IEBR), NC Vietnam: Ha Tinh, Huong Son, 18°22′N 106°13′E, 900 m, May 18, 1998, Malaise trap, AMNH, K. Long. Paratypes: 2♀, “Hel.077” (AMNH), same place; “Hel.078” (VNMN), same place, but May 18, 1998, AMNH, K. Long.

Distribution: NC Vietnam: Ha Tinh (Huong Son).

Biology: Unknown.

Diagnosis: Antenna with 34–35 segments, antennal segments 10–23 cream white; maxillary palp 1.6× as long as head; in frontal view height of eye 2.2× its transverse width; width of face 2.2× length of face and clypeus combined; frontal protuberance lamelliform, lower than level of lateral carina of frons; in dorsal view width of head 1.6× its median length; height of eye 1.45× temple; in lateral view height of eye 1.3× its transverse width; transverse width of eye 1.4× temple; face coarsely rugose; lateral area between antennal sockets and eye margin with transverse rugosities; clypeus rugose-punctate, malar space coarsely rugose. Mesosoma 1.65× longer than high; notauli wide, sparsely crenulate anteriorly, fused posteriorly with two parallel rugosities in large longitudinally rugose area close to scutellar sulcus; scutellar sulcus wide, 0.7× as long as scutellum; propodeum with basal median carina and large areola; propodeal areola nearly smooth, coriaceous; lateral areas of propodeum with transverse rugosities. Length of forewing 2.4× its maximum width; vein 3-SR short, 0.5× vein r; vein 2-M 3.4× 3-SR; hind wing broad, vein 1-M short, 0.3× vein 1r-m; vein SR of hind wing sinuate; vein 2-SC+R transverse; hind wing with 4 hamuli. Foretarsus 1.3× as long as foretibia; hind femur robust, with ventral serrations and stout tooth-shaped protuberance; length of hind femur (without protuberance and serrations) 3.2× its maximum width; hind coxa sparsely punctate laterally; hind femur reticulate-rugulose laterally. First metasomal tergite 1.4× longer than its apical width, with long dorsal carinae almost up to apex of tergite; first tergite largely smooth, somewhat coriaceous; median length of second tergite 0.7× its apical width, and 1.1× third tergite; second tergite smooth, with sparse large punctures apically.

Notes: W. undulata, sp. nov., runs to W. pterolophiae (Chou and Hsu, 1998), from China (couplet 20a) in the key by Yan et al. (2017), but differs as follows: (1) first tergite largely smooth or coriaceous with sparse punctures (smooth to moderately foveolate-punctate in W. pterolophiae); (2) hind tarsus whitish yellow (fourth and fifth tarsal hind segments brown, darker than third segment in W. pterolophiae); and (3) vein SR of hind wing sinuate (vein SR of hind wing slightly curved in W. pterolophiae).

Description: Holotype, ♀, body length 9.7 mm, forewing length 8.0 mm, ovipositor sheath 4.5 mm (fig. 116).

Head: Antenna with 35 segments; third antennal segment 1.1× as long as fourth segment (18:16); in frontal view height of eye 2.2× its transverse width (40:18); width of face 2.2× length of face and clypeus combined (53:24); malar space as long as mandible width (15:15) and 0.4× height of eye (15:40) (fig. 118); maxillary palp 1.6× as long as head (51:31); tentorial pits distinct, distance between tentorial pits 0.9× distance between pit and eye (17:19); frontal protuberance lamelliform, lower than level of lateral carina of frons; in dorsal view width of head 1.6× its median length (87:54); height of eye 1.45× as long as temple (29:20); ocelli rather large, POL:OD:OOL = 10:7:20; distance between front and hind ocelli 0.25× OOL (5:20) (fig. 117); in lateral view height of eye 1.3× its transverse width (39:29); transverse width of eye 1.2× temple (29:24) (fig. 119); face coarsely rugose; lateral area between antennal sockets and eye margin with transverse rugosities; clypeus rugose-punctate, malar space coarsely rugose; frons smooth; vertex and temple almost smooth with scattered fine punctures.

Mesosoma: Mesosoma 1.65× longer than high (48:29) (fig. 121); pronotal side coarsely rugose, densely punctate dorsally; mesopleuron smooth medially, punctate-reticulate ventrally; metapleuron areolate-rugulose; median lobe of mesoscutum sparsely punctate, reticulate-rugulose posteriorly; lateral lobes of mesoscutum almost smooth; notauli wide, sparsely crenulate anteriorly, fused posteriorly with two parallel rugosities in large longitudinally rugose area close to scutellar sulcus (fig. 120); scutellar sulcus wide, with 3 carinae, two lateral carinae sinuate, 0.7× as long as scutellum (15:21); scutellum sparsely punctate; propodeum with mediobasal carina and large areola (fig. 123); areola smooth or coriaceous; lateral areas of propodeum with transverse rugosities.

Wings: Forewing: length of forewing 2.4× its maximum width (120:49); pterostigma 3.4× longer than wide (41:12); vein 3-SR short, 0.5× vein r; r:2-SR:3-SR:SR1:r-m = 15:18:8:60:12; 1-CU1:cu-a:2-CU1 = 4:13:21; second submarginal cell trapezium-shaped, vein 2-M 3.4× 3-SR (27:8); hind wing broad, vein 1-M short, 0.3× vein 1r-m (3:10); vein 2-SC+R transverse (fig. 125); hind wing with 4 hamuli.

Legs: Foretarsus 1.3× longer than foretibia (45:35); hind femur robust, with ventral serrations and stout tooth-shaped protuberance (fig. 122); length of hind femur (without protuberance or serrations), tibia, and basitarsus 3.2 (57:18), 9.9 (89:9), and 7.25× (29:4) as long as their maximum width, respectively; hind coxa sparsely punctate laterally; hind femur reticulate-rugulose laterally; hind basitarsus 0.3× as long as hind tibia (29:89), and 0.7× as long as hind tarsal segments 2–5 (29:41); fourth hind tarsal segment 0.4× as long as telotarsus (5:14).

Metasoma: Metasoma 0.7× as long as head and mesosoma combined (45:63); first tergite 1.4× longer than its apical width (55:40), with long dorsal carinae almost up to apex of tergite, converging apically (fig. 124); first tergite almost smooth or coriaceous (fig. 124); median length of second tergite 0.7× its apical width (28:42), and 1.1× third tergite (28:25); second tergite smooth, with sparse large punctures apically; third tergite smooth; ovipositor sheath 0.6× as long as forewing (45:80).

Color: Body dark brown; scapus light brown; antenna brown, with 11th–23rd antennal segments cream white; palpi yellow; fore- and middle legs yellow, but tibia pale yellow, tarsus whitish yellow; hind coxa, trochanter, and trochantellus yellow; hind femur yellow basally and ventrally, brown dorsoapically; hind tibia yellow basally, infuscate medially, brown apically; hind tarsus whitish yellow; pterostigma and wing veins brown; wing membrane yellow; first metasomal tergite yellow; second and third tergites dark brown; remainder of metasoma light brown, ovipositor sheath brown.

Male: Unknown.

Etymology: From undulatus (Latin for “wavy”), because of the sinuate vein SR of the hind wing.

Variation: Female paratypes: antenna with 34–35 segments and 10th–22nd segments cream white; body length 8.0–8.5 mm; forewing 6.4–6.8 mm; ovipositor sheath 4.4–4.6 mm; hind wing with 3 hamuli.

Type Material: Holotype, ♀, “Hel.039” (IEBR), NE Vietnam: Tuyen Quang, Na Hang, Son Phu, forest, MT, 20°17′32″N 105°28′19″E, 573 m, 25.v.2017, K.D. Long. Paratype: 1♀, “Hel.019” (VNMN), NE Vietnam: Vinh Phuc, Tam Dao NP, forest, M[alaise]T[rap], 21°17′N 105°38′E, 950 m, 1-10.vi.2012, K.D. Long.

Distribution: NE Vietnam: Tuyen Quang (Na Hang NP), Vinh Phuc (Tam Dao NP).

Biology: Unknown.

Diagnosis: Antenna with 36–38 segments, segments 10–24 cream white; maxillary palp 1.8× as long as head; frontal protuberance large, with distinctly ledge halfway and blunt dorsally (fig. 127); in dorsal view width of head 1.7× its median length; height of eye 1.4× temple; in frontal view height of eye 1.7× its transverse width; width of face 1.8× length of face and clypeus combined; malar space 0.3× height of eye; in lateral view height of eye 1.3× as long as transverse width; transverse width of eye 1.6× temple. Mesosoma 2.2× longer than high; notauli deep, sparsely crenulate anteriorly, fused posteriorly with two rugosities forming one median carina close to scutellar sulcus; scutellar sulcus 0.5× scutellum; propodeum with mediobasal carina and trace of round areola, largely rugose. Length of forewing 2.9× its maximum width; vein 3-SR 1.1× vein r; vein 2-M 2.1× 3-SR; hind wing vein 1-M 0.9× vein 1r-m; vein 2-SC+R vertical; hind wing with 4 hamuli. Foretarsus 1.3× as long as foretibia; hind femur robust, with ventral serrations and stout tooth-shaped protuberance; length of hind femur (without tooth or serrations) 3.2× as long as its maximum width; hind coxa punctate laterally; hind femur largely rugose-punctate laterally. First metasomal tergite slightly widened apically, 1.3× longer than its apical width; dorsal carinae in basal 0.7 of tergite; first tergite smooth basally and apically, coriaceous medially, areolate-rugulose subapically and laterally; median length of second tergite 0.4× its apical width; length of second tergite 0.8× as long as third tergite; second and third tergites smooth.

Notes: W. vietnamica, sp. nov., runs in the key by Yan et al. (2017) to W. unicornis (Turner, 1918) but differs as follows: (1) in dorsal view eye 1.4× as long as temple (1.8–2.0× in W. unicornis); (2) hind femur robust, length of hind femur 3.2× its maximum width (4.0 in W. unicornis); and (3) vein 2-SC+R of hind wing vertical (vein 2-SC+R horizontal in W. unicornis).

Description: Holotype, ♀, body length 8.6 mm, forewing length 6.9 mm, ovipositor sheath 5.4 mm (fig. 126).

Head: Antenna with 36 segments; third antennal segment 1.1× longer than fourth segment (18:17); in frontal view height of eye 1.7× its transverse width (30:18); width of face 1.8× length of face and clypeus combined (43:24); malar space 0.85× as long as mandible width (12:14) and 0.3× height of eye (12:39) (fig. 128); maxillary palp 1.8× as long as head (64:36); frontal protuberance large, with distinct ledge halfway and blunt dorsally; in dorsal view width of head 1.7× its median length (78:47); height of eye 1.4× temple (29:16); ocelli rather large, POL:OD:OOL = 6:6:17; distance between front and hind ocelli, 0.2× OOL (4:17) (fig. 127); in lateral view height of eye 1.3× its transverse width (39:29); transverse width of eye 1.6× temple (28:17) (fig. 129); face coarsely rugose; clypeus rugose; frons, vertex, and temple smooth.

Mesosoma: Mesosoma 2.2× longer than high (63:29) (fig. 131); pronotal side coarsely carinate-rugose medioanteriorly; largely rugose ventrally and posteriorly; mesopleuron smooth medially, foveolate-punctate ventrally; metapleuron areolate-rugulose; lobes of mesoscutum sparsely punctate, but median lobe largely rugose posteriorly; notauli deep, sparsely crenulate anteriorly, fused posteriorly with two rugosities forming one median carina close to scutellar sulcus (fig. 130); scutellar sulcus smooth, with 3 carinae, 0.5× as long as scutellum (10:21); scutellum sparsely punctate; propodeum with mediobasal carina and trace of round areola (fig. 134), largely rugose.

Wings: Forewing: length of forewing 2.9× its maximum width (106:36); pterostigma 3.3× as long as wide (50:15); vein 3-SR 1.1× vein r; r:2-SR:3-SR:SR1:r-m = 15:20:17:76:15; 1-CU1:cu-a:2-CU1 = 4:16:28; second submarginal cell trapezium-shaped, vein 2-M 2.1× 3-SR (36:17) (fig. 136); hind wing vein 1-M 0.9× as long as vein 1r-m (13:15); vein 2-SC+R vertical (fig. 135); hind wing with 4 hamuli.

Legs: Foretarsus 1.3× longer than foretibia (39:29); hind femur robust, with ventral serrations and stout tooth-shaped protuberance (fig. 133); length of hind femur (without tooth or serrations), tibia, and basitarsus 3.2 (73:23), 8.3 (108:13), and 5.4× (38:7) as long as their maximum width, respectively; hind coxa punctate laterally; hind femur largely rugose-punctate laterally (fig. 133); hind basitarsus 0.35× as long as hind tibia (38:108), and 0.8× as long as hind tarsal segments 2–5 (38:50); fourth hind tarsal segment 0.5× telotarsus (6:13).

Metasoma: Metasoma 0.9× as long as head and mesosoma combined (45:50); first tergite slightly widened apically, 1.3× longer than its apical width (58:43); dorsal carinae in basal 0.7 of tergite (44:60) (fig. 132); first tergite smooth basally and apically, coriaceous medially, areolate-rugulose subapically and laterally (fig. 132); median length of second tergite 0.4× its apical width (20:45), and 0.8× third tergite (20:25); second suture distinct; second and third tergites smooth; ovipositor sheath 0.8× as long as forewing (54:69).

Color: Body black; scapus black; antenna dark brown, with antennal segments 11–22 cream white; palpi pale yellow; fore- and middle legs yellow; hind coxa, trochanter and trochantellus yellow; hind femur and tibia yellow, but both apically brown; hind tarsus pale yellow; pterostigma and wing veins brown; wing membrane hyaline; metasoma dark brown to black, but first sternite cream white; ovipositor sheath brown.

Male: Unknown.

Etymology: The new species is named after the country where the new species was discovered (Vietnam).

Variation: Female paratype: body length 10.5 mm, forewing 8.7 mm, ovipositor sheath 7.0 mm, antenna with 38 segments and antennal segments 10–24 cream white.