A neotype for Anaphes flavipes (Foerster, 1841) (Hymenoptera: Mymaridae), a biological control agent of Oulema melanopus (Linnaeus, 1758) (Coleoptera: Chrysomelidae), is designated. The extensive literature on A. flavipes is compiled and the morphological variability of selected morphological structures of numerous reared specimens from across its presently known geographic range (mainly eastern Nearctic and western Palearctic) is described. Anaphes flavipes is compared with what appears to be morphologically and biologically the most similar species, A. nipponicus Kuwayama, 1932, from Japan, which is briefly redescribed. Anaphes auripes Walker, 1846, syn. nov., is placed in synonymy under A. flavipes. The following new country and state records for A. flavipes are provided: Czech Republic, Ukraine, Canada (Nova Scotia), USA (Virginia).