Sphex melanopus Dahlbom, 1843:27 - Callan, 1990Callan, E.Mc C. 1990. Sphecidae of Trinidad. I. Ampulicinae, Sphecinae and Pemphredoninae. Sphecos 20:19. (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); Starr & Hook, 2003Starr, C.K. & Hook, A.W. 2003. The aculeate Hymenoptera of Trinidad, West Indies. Occasional Papers o the Department of Life Sciences, University of the West Indies 12:1-31. (distribution).
Sphex difficilis Spinola, 1851:54, ♀. Holotype ♀, Para (leg. M. Ghiliani). - Saussure, 1868Saussure, H.de 1868. Hymenoptera. Familien der Vespiden, Sphegiden, Pompiliden, Crabroniden und Heterogynen. In: Reise der Österreichischen Fregatte Novara um die Erde. 1857–1859. Zoologischer Theil. part 1. Wien. 138 pp., 4 pl. (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); 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.:75 ( listed as synonym of Sphex melanopus Dahlbom, 1843).
Sphex proxima Smith, 1856:258, ♀. ♀, Brazil (B.M.). - 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.:75 ( listed as synonym of Sphex melanopus Dahlbom, 1843).
Sphex ruficauda Taschenberg, 1869:418, ♂.Amer. meridion.. - Kohl, 1890Kohl, F.F. 1890. Die Hymenopterengruppe der Sphecinen. I. Monographie der natürlichen Gattung Sphex Linné (sens. lat.). Annalen des Naturhistorischen Museums in Wien 5:77-194, 317-462. (distribution); Berland, 1929Berland, M.L. 1929. Les Sphegidae (Hyménoptères) du Muséum National de Paris. Bulletin du Muséum National d'Histoire Naturelle (Série 2) 1:309-312. (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.:75 ( listed as synonym of Sphex melanopus Dahlbom, 1843). - As Sphex ruficaudus: - Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (distribution).
Sphex funestus Kohl, 1890:154 (key), 397, ♀. ♀, Nearktische Region. - Kohl, 1890Kohl, F.F. 1890. Die Hymenopterengruppe der Sphecinen. I. Monographie der natürlichen Gattung Sphex Linné (sens. lat.). Annalen des Naturhistorischen Museums in Wien 5:77-194, 317-462. (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); 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.:75 ( listed as synonym of Sphex melanopus Dahlbom, 1843).