Tersoakus gen. nov., a new genus of cremastine wasps from the Russian Far East (Hymenoptera: Ichneumonidae: Cremastinae)

The new genus of ichneumonid wasps, Tersoakus gen. nov. (type species and only known species: Tersoakus kasparyani spec. nov.), is described from the Russian Far East. The genus is mainly characterized by the peculiar forewing venation, i.e., the apex of the disco-cubital vein connected with the base of second abscissa of the radius, and also by the presence of an outer tooth at the apex of the fore tibia and by the triangular hypopygium of the female.