Crabro semipunctatus Lepeletier & Brullé, 1834:711, ♀.Rio-Janeiro (Muséum d'histoire naturelle, leg. M. Gaudichaud). - Lepeletier, 1845Lepeletier de Saint Fargeau, A.L.M. 1845. Histoire naturelle des Insects. Suites à Buffon. Hyménoptères, III. Roret, Paris. 1-646. (distribution). - As Ectemnius semipunctatus: - Callan, 1991Callan, E.Mc C. 1991. Sphecidae of Trinidad. III. Crabroninae, Nyssoninae and Philanthinae. Sphecos 21:8-12. (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); Leclercq, 2007Leclercq, J. 2007. Hyménoptères Crabroniens des Amériques du genre Ectemnius Dahlbom 1845 (Hymenoptera: Crabronidae Crabronini). Notes fauniques de Gembloux 60 (4):163-177. (distribution); Silvestre et al., 2014Silvestre, R., M.F. Demétrio, B.M. Trad, F. Varussa & O. Lima 2014. Diversity and distribution of Hymenoptera Aculeata in Midwestern Brazilian dry forests. In: Greer, F.E. (Ed.). Dry Forests. 29-80. (distribution); Hook et al., 2014Hook, A.W., J.L. Neff, M.S. Engel & H. Court 2014. The Apoidea (Hymenoptera) Fauna of Little Tobago Island, West Indies. Journal of the Kansas Entomological Society 87 (2):242-244. (distribution).
Crabro opulentus Smith, 1856:423, ♀. ♀, Brazil (H. W. Bates). - 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.:28 ( listed as synonym of Ectemnius semipunctatus (Lepeletier & Brullé, 1834)).
Crabro championi Cameron, 1891:142, ♀. ♀, Guatemala, Las Mercedes 3000 feet (leg. Champion). - Cameron, 1888-1900Cameron, P. 1888-1900. Biologia Centrali-Americana - Insecta. Hymenoptera. (Fossores) Vol. II. R. H. Porter and Dulau & Co., London. 413pp, 14 pl.:142 (listed); 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.:28 ( listed as synonym of Ectemnius semipunctatus (Lepeletier & Brullé, 1834)). - As Crabro championii: - Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (distribution).
Crabro atitlanæ Cameron, 1891:143, ♀. ♀, Guatemala, Volcan de Atitlan 2500 to 3500 feet (leg. Champion). - Cameron, 1888-1900Cameron, P. 1888-1900. Biologia Centrali-Americana - Insecta. Hymenoptera. (Fossores) Vol. II. R. H. Porter and Dulau & Co., London. 413pp, 14 pl.:143 (listed); 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.:28 ( listed as synonym of Ectemnius semipunctatus (Lepeletier & Brullé, 1834)).
Crabro fumosus Brèthes, 1910:282 - 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.:28 ( listed as synonym of Ectemnius semipunctatus (Lepeletier & Brullé, 1834)).