Cerceris aequalis Provancher, 1888:417, Scullen, 1965Scullen, H.A. 1965. Review of the genus Cerceris in America North of Mexico (Hymenoptera: Sphecidae). Proceedings of the United States National Museum 116:333-547.:453, Lectotype ♀ (U.S. National Museum, no. 1974); Ferguson, 1983Ferguson, G.R. 1983. An annotated synonymic list of North American and Caribbean wasps of the genus Cerceris (Hymenoptera: Philanthidae). Journal of the New York Entomological Society 91 (4):466-502.:469, Lectotype ♀ (United States National Museum of Natural History, Washington). - Ferguson, 1983Ferguson, G.R. 1983. An annotated synonymic list of North American and Caribbean wasps of the genus Cerceris (Hymenoptera: Philanthidae). Journal of the New York Entomological Society 91 (4):466-502. (distribution).
Cerceris aequalis idahoensis Scullen, 1965:454, ♀. Holotype ♀, Craig's Mt., Idaho (Philadelphia Academy of Natural Sciences, no. 5040, leg. Wm. J. Fox); Ferguson, 1983Ferguson, G.R. 1983. An annotated synonymic list of North American and Caribbean wasps of the genus Cerceris (Hymenoptera: Philanthidae). Journal of the New York Entomological Society 91 (4):466-502.:469, Holotype ♀ (Academy of Natural Sciences of Philadelphia, No. 5040). Synonymized with Cerceris aequalis Provancher, 1888 by Ferguson, 1983Ferguson, G.R. 1983. An annotated synonymic list of North American and Caribbean wasps of the genus Cerceris (Hymenoptera: Philanthidae). Journal of the New York Entomological Society 91 (4):466-502.:469. - Scullen, 1965Scullen, H.A. 1965. Review of the genus Cerceris in America North of Mexico (Hymenoptera: Sphecidae). Proceedings of the United States National Museum 116:333-547. (distribution).