Dalla Torre K. W. von, 1902: Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen III: Trigonalidae, Megalyridae, Stephanidae, Ichneumonidae, Agriotypidae, Evaniidae, Pelecinidae. viii + 1141 pp. Cover scratched with free back, text clear in excellent condition, pages well-bound without any free or torn ones.  Discount 50%!