Pimpla tenuicornis Cresson, 1865:267, ♀. Holotype ♀, Colorado Territory, 1864 (leg. Mr. James Ridings). - Cresson, 1872Cresson, E.T. 1872. Hymenoptera Texana. Transactions of the American Entomological Society 4:153-292. (distribution); Dalla Torre, 1901-1902Dalla Torre, C.G. 1901-1902. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. — Volumen III: Trigonalidae, Megalyridae, Stephanidae, Ichneumonidae, Agriotypidae, Evaniidae, Pelecinidae. Pars II. Breitkopf & Härtel, Leipzig. VIII + 1141. (distribution); Morley, 1914Morley, C. 1914. A revision of the Ichneumonidae based on the collection in the British Museum (Natural History) Part III: Tribes Pimplides and Bassides. British Museum, London, England. 1-148.:66 ( listed as synonym of Pimpla turionellae Linnaeus, 1758). - As Ephialtes tenuicornis: - Cushman, 1920Cushman, R.A. 1920. The North American Ichneumon-flies of the Tribe Ephialtini. Proceedings of the United States National Museum 58 (2340):327-362, 1 pl. (distribution).
Pimpla aequalis Provancher, 1880:36, 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.:341, Type ♀ (Quebec). - As Coccygomimus aequalis: - 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); 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 Ephialtes aequalis: - Cushman, 1920Cushman, R.A. 1920. The North American Ichneumon-flies of the Tribe Ephialtini. Proceedings of the United States National Museum 58 (2340):327-362, 1 pl. (distribution).
Meniscus marginatus Provancher, 1883:15 - Cushman, 1920Cushman, R.A. 1920. The North American Ichneumon-flies of the Tribe Ephialtini. Proceedings of the United States National Museum 58 (2340):327-362, 1 pl.:338 ( listed as synonym of Ephialtes tenuicornis (Cresson, 1865)).
Meniscus Ashmeadii Provancher, 1888:430, 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.:341, Type ♀ (Quebec). - Cushman, 1920Cushman, R.A. 1920. The North American Ichneumon-flies of the Tribe Ephialtini. Proceedings of the United States National Museum 58 (2340):327-362, 1 pl.:338 ( listed as synonym of Ephialtes tenuicornis (Cresson, 1865)); 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.:341 ( listed as synonym of Coccygomimus aequalis (Provancher, 1880)); 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.:344 ( listed as synonym of Coccygomimus aequalis (Provancher, 1880)).
Pimpla conquisitor rufuscula Davis, 1897:368, ♀. 2 ♀♀, Michigan and northern Illinois (leg. Dr. Nason); 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.:341, Lectotype ♀ (Philadelphia). - Davis, 1897Davis, G.C. 1897. Descriptions of new species of Trigonalidae, Stephanidae and Ichneumonidae. Transactions of the American Entomological Society 24:349-372. (distribution); Cushman, 1920Cushman, R.A. 1920. The North American Ichneumon-flies of the Tribe Ephialtini. Proceedings of the United States National Museum 58 (2340):327-362, 1 pl.:338 ( listed as synonym of Ephialtes aequalis (Provancher, 1880)); 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.:341 ( listed as synonym of Coccygomimus aequalis (Provancher, 1880)); 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.:344 ( listed as synonym of Coccygomimus aequalis (Provancher, 1880)).
Scambus marginatus Viereck, 1917:322 - Cushman, 1920Cushman, R.A. 1920. The North American Ichneumon-flies of the Tribe Ephialtini. Proceedings of the United States National Museum 58 (2340):327-362, 1 pl.:338 ( listed as synonym of Ephialtes aequalis (Provancher, 1880)).