Stigmus parallèlus Say, 1837:378,Mexico. - Cresson, 1862Cresson, E.T. 1862. Catalogue of the described species of North American Hymenoptera (Continued from page 211.). Proceedings of the Entomological Society of Philadelphia 1 (8):227-238. (distribution); 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.:140 (listed); Cameron, 1891Cameron, P. 1891. Biologia Centrali-Americana. Insecta. Hymenoptera. (Fossores) Vol. II. :130-176. (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. (distribution); Nava-Bolaños & Osorio-Olvera, 2022Nava-Bolaños, A. & L. Osorio-Olvera 2022. Estado del arte del conocimiento de biodiversidad de los polinizadores de México. Revista Mexicana de Biodiversidad 93:1-77. (distribution). - As Cemonus parallelus: - Smith, 1856Smith, F. 1856. Catalogue of Hymenopterous Insects in the Collection of the British Museum. Part IV. Sphegidae, Larridae, and Crabronidae. London. 497 pp. (distribution).