Cerceris semipetiolata Saussure, 1867:88, ♂. ♂, Mexico Temperata: Orizaba; Scullen, 1972Scullen, H.A. 1972. Review of the genus Cerceris Latreille in Mexico and Central America (Hymenoptera: Sphecidae). Smithsonian Contributions to Zoology 110:1-121.:52, Type, No type or other named material was found by the writer at Vienna or Geneva in 1959; Ferguson, 1983Ferguson, G.R. 1983. An annotated synonymic list of North American and Caribbean wasps of the genus Cerceris (Hymenoptera: Philanthidae). Journal of the New York Entomological Society 91 (4):466-502.:493, Holotype ♂ (type not located). - Schletterer, 1887Schletterer, A. 1887. Die Hymenopteren-Gattung Cerceris Latr. mit vorzugsweiser Berücksichtigung der paläarktischer Arten. Zoologische Jahrbücher / Abteilung für Systematik, Ökologie und Geographie der Tiere 2:349-510. (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.:118 (listed); Cameron, 1890Cameron, P. 1890. Biologia Centrali-Americana. Insecta. Hymenoptera. (Fossores) Vol. II. :65-129. (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).
Cerceris williamsi Scullen, 1972:54, ♀. Holotype ♀, Mexico: Fortin de las Flores, Veracruz Llave, 17 September 1954 (California Academy of Sciences, leg. F.X. Williams); Ferguson, 1983Ferguson, G.R. 1983. An annotated synonymic list of North American and Caribbean wasps of the genus Cerceris (Hymenoptera: Philanthidae). Journal of the New York Entomological Society 91 (4):466-502.:493, Holotype ♀ (California Academy of Sciences, San Francisco). Synonymized with Cerceris semipetiolata Saussure, 1867 by Ferguson, 1983Ferguson, G.R. 1983. An annotated synonymic list of North American and Caribbean wasps of the genus Cerceris (Hymenoptera: Philanthidae). Journal of the New York Entomological Society 91 (4):466-502.:493. - 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.:61 ( listed as synonym of Cerceris semipetiolata Saussure, 1867).