Stizus grandis Say, 1823:77 - Packard, 1867Packard, A.S. 1867. Revision of the fossorial Hymenoptera of North America. I. Crabronidae and Nyssonidae. Proceedings of the Entomological Society of Philadelphia 6:353-453. (distribution); Cameron, 1888-1900Cameron, P. 1888-1900. Biologia Centrali-Americana - Insecta. Hymenoptera. (Fossores) Vol. II. R. H. Porter and Dulau & Co., London. 413pp, 14 pl.:91 ( listed as synonym of Sphecius speciosus (Drury, 1773)). - As Sphecius grandis: - Handlirsch, 1889Handlirsch, A. 1889. Monographie der mit Nysson und Bembex verwandten Grabwespen. IV. Sitzber. Akad. Wiss. Wien Abt. 1 98:440-517. (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); 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); Amarante, 2002Amarante, S.T.P. 2002. A synonymic catalog of the neotropical Crabronidae and Sphecidae (Hymenoptera: Apoidea). Arquivos de Zoologia (São Paulo) 37:1-139. (distribution); Holliday & Coelho, 2006Holliday, C.W. & J.R. Coelho 2006. Improved key to New World species of Sphecius (Hymenoptera: Crabronidae). Annals of the Entomological Society of America 99 (5):793-798. (distribution); Horta Vega et al., 2007Horta Vega, J.V., O.N. Pinson Domínguez, L. Barrientos Lozano & A. Correa Sandoval 2007. Sphecidae y Crabronidae (Hymenoptera) de algunos municipios del centro y sur de Tamaulipas, México. Acta Zool. Mex. (n.s.) 23:35-48. (distribution).
Stizus fervidus Cresson, 1872:223, ♀. Holotype ♀, Texas (leg. Heiligbrodt). - Cameron, 1888-1900Cameron, P. 1888-1900. Biologia Centrali-Americana - Insecta. Hymenoptera. (Fossores) Vol. II. R. H. Porter and Dulau & Co., London. 413pp, 14 pl.:91 ( listed as synonym of Sphecius speciosus (Drury, 1773)); 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.:1698 ( listed as synonym of Sphecius grandis (Say, 1823)); Amarante, 2002Amarante, S.T.P. 2002. A synonymic catalog of the neotropical Crabronidae and Sphecidae (Hymenoptera: Apoidea). Arquivos de Zoologia (São Paulo) 37:1-139.:18 ( listed as synonym of Sphecius grandis (Say, 1823)). - As Sphecius fervidus: - Handlirsch, 1889Handlirsch, A. 1889. Monographie der mit Nysson und Bembex verwandten Grabwespen. IV. Sitzber. Akad. Wiss. Wien Abt. 1 98:440-517. (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).
Stizus nevadensis Cresson, 1874:99, ♂. 3 ♂♂, Nevada. - Handlirsch, 1889Handlirsch, A. 1889. Monographie der mit Nysson und Bembex verwandten Grabwespen. IV. Sitzber. Akad. Wiss. Wien Abt. 1 98:440-517. (distribution), 465 ( listed as synonym of Sphecius fervidus (Cresson, 1872)); Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749.:516 ( listed as synonym of Sphecius fervidus (Cresson, 1872)); 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.:1698 ( listed as synonym of Sphecius grandis (Say, 1823)); Amarante, 2002Amarante, S.T.P. 2002. A synonymic catalog of the neotropical Crabronidae and Sphecidae (Hymenoptera: Apoidea). Arquivos de Zoologia (São Paulo) 37:1-139.:18 ( listed as synonym of Sphecius grandis (Say, 1823)).