1 literature reference for Megastylus bimaculatus Dasch, 1992:

Author: Dasch, C.E.
Year: 1992
Title: The Ichneumon-flies of America north of Mexico: Part 12. Subfamilies Microleptinae, Helictinae, Cylloceriinae and Oxytorinae (Hymenoptera: Ichneumonidae).
Source: Memoirs of the American Entomological Institute. No. 52. 470 pp.