Ichneumon grandis Brullé, 1846:300, ♀. Holotype ♀, Philadelphie (Amér. du Nord) (leg. M. Serville). - 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). - As Amblyteles grandis: - Ruíz-Cancino et al., 2012Ruíz-Cancino, E., J.M. Coronado-Blanco, A.I. Khalaim, D.R. Kasparyan, A.M. Corona López & E.T. Sánchez 2012. Ichneumonidae (Hym.) de algunos estados del centro de México. Entomología mexicana 11 (2):1039-1044. (distribution). - As Protichneumon grandis: - Morley, 1915Morley, C. 1915. A revision of the Ichneumonidae based on the collection in the British Museum (Natural History) with descriptions of new genera and species. Part IV: Tribes Joppides, Banchides and Alomyides. British Museum, London, England. 1-167. (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).
Ichneumon ambiguus Cresson, 1864:161, ♂. ♂, Pennsylvania (leg. E. T. Cresson). - 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.:534 ( listed as synonym of Protichneumon grandis (Brullé, 1846)).
Ichneumon regnatrix Cresson, 1864:178, ♀. ♀, Penn., Del., Va. (leg. Dr. T. B. Wilson). - Cresson, 1864Cresson, E.T. 1864. Descriptions of North American Hymenoptera, in the Collection of the Entomological Society of Philadelphia. Proceedings of the Entomological Society of Philadelphia 3:131-196. (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.:534 ( listed as synonym of Protichneumon grandis (Brullé, 1846)).
Protichneumon grandis victoriae Heinrich, 1961:25 Synonymized with Protichneumon grandis (Brullé, 1846) 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.:534.