Nysson mellipes Cresson, 1882:279, ♂♀. 3 ♂♀, Colorado, Dakota, Montana (leg. Morrison). - Cresson, 1882Cresson, E.T. 1882. Descriptions of the species belonging to the genus Nysson inhabiting North America. Transactions of the American Entomological Society 9 (3/4):273-284. (distribution); Handlirsch, 1887Handlirsch, A. 1887. Monographie der mit Nysson und Bembex verwandten Grabwespen. Sitzber.Akad.Wissn.Wien, Math.-Naturw.Classe 95, Abt. 1 95:246-421. (distribution); Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (distribution). - As Epinysson mellipes: - 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 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209. (distribution); Hook, 1998Hook, A.W. 1998. New distribution records of aculeate wasps in Texas and adjacent states (Hymenoptera: Sphecidae, Pompilidae, Mutillidae). Southwestern Naturalist 43 (2):249-255. (distribution).
Nysson submellipes Viereck, 1904:237 - 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 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209.:1689 ( listed as synonym of Epinysson mellipes (Cresson, 1882)).