First North American records are presented for Cryptocephalus moraei (Linnaeus, 1758) (Coleoptera: Cryptocephalinae) and Psylliodes dulcamarae (Koch, 1803) (Coleoptera: Galerucinae: Alticini), as confirmed by morphology and DNA barcoding. Additional information is presented about phenology and host use for C. moraei, the first European Cryptocephalinae to be found elsewhere as conclusively adventive. Cryptocephalus moraei is expected to have no ecological impact on its host, the adventive Hypericum perforatum Linnaeus (Hypericaceae). However, P. dulcamarae, the second recently discovered flea beetle associated with the adventive Solanum dulcamara Linnaeus (Solanaceae), probably does harm that host. Both species are hypothesised to have arrived from Europe with woody plant material imported with soil during 1960–1965. A literature review of introduced Chrysomelidae found that Canada and the United States of America are together home to 68–78 species of adventive Chrysomelidae. All non-Bruchinae species among these are both native to Europe and occur either in Canada or both Canada and United States of America, except for intentionally introduced biological control agents and two species that feed on Eucalyptus L’Héritier de Brutelle (Myrtaceae). This suggests a dominant role of accidental introductions of cool-climate European species in recent unplanned additions to the fauna of leaf-feeding Chrysomelidae in North America.

形态学和 DNA 条形码证实了Cryptocephalus moraei (Linnaeus, 1758) (Coleoptera: Cryptocephalinae) 和Psylliodes dulcamarae (Koch, 1803) (Coleoptera: Galerucinae: Alticini) 的第一个北美记录。提供了关于C. moraei 的物候学和宿主使用的其他信息，这是第一个在其他地方发现的欧洲隐头孢菌亚科。Cryptocephalus moraei预计不会对其宿主产生生态影响，即外来的贯叶金丝桃（金丝桃科）。然而，P. dulcamarae，第二个最近发现的与出现的Solanum dulcamara相关的跳蚤甲虫Linnaeus（茄科），可能会伤害宿主。假设这两个物种都是在 1960 年至 1965 年期间随土壤一起进口的木本植物材料从欧洲抵达的。对引进的金蝶科的文献回顾发现，加拿大和美国共同拥有 68-78 种外来金蝶科。除了有意引入的生物防治剂和两种以Eucalyptus L'Héritier de Brutelle（桃金娘科）为食的物种外，其中的所有非 Bruchinae 物种均原产于欧洲并出现在加拿大或加拿大和美国。这表明，欧洲凉爽气候物种的意外引入在最近对北美食叶金蝶科动物群的计划外增加中起了主导作用。