A survey of Sminthurides Börner, 1900 with specimens from the Americas was performed and two new species from Mexico are described and illustrated (drawings and SEM photographs), including a detailed study of body chaetotaxy. Sminthurides cihuatlensis sp. nov. is part of the Aquaticus group by the presence of ciliate seta B1 on Ant. II; it has a narrow mucro and lives in soil from the slopes of Iztaccíhuatl volcano. Sminthurides fridakahloae sp. nov. belongs to the Penicillifer group by the presence of Tra-2 on the Ant. II; it has a broad, trilamellate mucro, dens with plurichaetosis, and lives on surface freshwater from Colima and Morelos states. In addition, a key for the species is provided.

1900 年对Sminthurides Börner进行了一项对美洲标本的调查，并描述和说明了来自墨西哥的两个新物种（图纸和 SEM 照片），包括对身体毛状体的详细研究。Sminthurides cihuatlensis sp. 年11月。由于存在于蚂蚁上的纤毛虫刚毛B1，它属于Aquaticus群的一部分。二；它有一个狭窄的 mucro，生活在 Iztaccíhuatl 火山斜坡的土壤中。Sminthurides fridakahloae sp. 十一月 由于Tra-2的存在而属于Penicillifer组 在蚂蚁上。二；它有一个宽阔的三片状小体，有多毛虫的巢穴，生活在科利马州和莫雷洛斯州的地表淡水中。此外，还提供了物种的密钥。