Megarhyssa greenei Viereck, 1910:627 Nomen nudum. Nomen nudum. Nomen nudum. - Michener, 1939Michener, C.D. 1939. Notes on North American species of Megarhyssa (Hymenoptera, Ichneumonidae). The Pan Pacific Entomologist 15 (2):126-132. (distribution).Megarhyssa greenei Viereck, 1910:627 Nomen nudum. Nomen nudum. Nomen nudum. - Michener, 1939Michener, C.D. 1939. Notes on North American species of Megarhyssa (Hymenoptera, Ichneumonidae). The Pan Pacific Entomologist 15 (2):126-132. (distribution).
Megarhyssa greenei Viereck, 1911:191, Merrill, 1815Merrill, J.H. 1815. On some genera of the pimpline ichneumonidae. Transactions of the American Entomological Society 91:109-154.:136, Type (U.S.N.M., No. 13,499); Rohwer, 1920Rohwer, S.A. 1920. The North American Ichneumon-flies of the tribes Labenini, Rhyssini, Xoridini, Odontomerini, and Phytodietini. Proceedings of the United States National Museum 57:405-474.:426, Type (U.S.N.M., No. 13499); Townes & Townes, 1960Townes, H.K. & M. Townes 1960. Ichneumon-flies of America North of Mexico: 2. Subfamilies Ephialtinae, Xoridinae, Acaenitinae. Bulletin of the United States National Museum 216 (2):1-676.:422, Type ♀ (Washington). - Merrill, 1815Merrill, J.H. 1815. On some genera of the pimpline ichneumonidae. Transactions of the American Entomological Society 91:109-154.:136 (listed); Rohwer, 1920Rohwer, S.A. 1920. The North American Ichneumon-flies of the tribes Labenini, Rhyssini, Xoridini, Odontomerini, and Phytodietini. Proceedings of the United States National Museum 57:405-474. (distribution); Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198. (distribution). - As Megarhyssa greenei greenei: - Townes & Townes, 1960Townes, H.K. & M. Townes 1960. Ichneumon-flies of America North of Mexico: 2. Subfamilies Ephialtinae, Xoridinae, Acaenitinae. Bulletin of the United States National Museum 216 (2):1-676. (distribution).
Megarhyssa greenei floridana Townes & Townes, 1960:424, ♀. Holotype ♀, Winter park, Fla., Apr. 1, 1936 (Washington, USNM, 63720, leg. O.D. Link). Synonymized with Megarhyssa greenei Viereck, 1911 by Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198.:354. - Pook et al., 2016Pook, V.G., M.J. Sharkey & D.B. Wahl 2016. Key to the species of Megarhyssa (Hymenoptera, Ichneumonidae, Rhyssinae) in America, north of Mexico. Deutsche entomologische Zeitschrift 63 (1):137-148.:141 ( listed as synonym of Megarhyssa greenei Viereck, 1911).