Toxoneuron (Hymenoptera : Braconidae): Designation of a neotype for its type species, T-viator, and discovery of a possible senior synonym of its best known species, T-nigriceps

A neotype is designated for Bracon (Toxoneuron) viator Say and a detailed r edescription is provided. A lectotype for Toxoneuron bicolor Szepligeti is also designated, and the transfer of Cardiochiles nigriceps Viereck to the genus Toxoneuron is discussed. Morphological differences between T. bicolor and T. nigriceps are very minor, suggesting a potential synonymy, with bic olor as the senior synonym. Though biological data on T. bicolor are lackin g, distributional data indicate that differences in host specificity could be used to elucidate the relationship between these 2 nominal species.