Prosopis confluens Smith, 1853:24, ♀. ♀, St. John's Bluff, East Florida. - Cresson, 1869Cresson, E.T. 1869. Description of North American bees. No. 2. Proceedings of the Boston Society of Natural History 12:269-274. (distribution); Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution). - As Hylaeus confluens: - Meade-Waldo, 1923Meade-Waldo, G. 1923. Hymenoptera, fam. Apidae, subfam. Prosopidinae. Genera Insectorum 181:1-45. (distribution); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538. (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); Pascarella et al., 1999Pascarella, J.B., Waddington, K.D. & Neal, P.R. 1999. The Bee Fauna (Hymenoptera: Apoidea) of Everglades National Park, Florida and adjacent areas: Distribution, Phenology, and Biogeography. Journal of the Kansas Entomological Society 72 (1):32-45. (distribution); Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution); Owens et al., 2018Owens, B.E., L. Allain, E.C. van Gorder, J.L. Bossart & C.E. Carlton 2018. The bees (Hymenoptera: Apoidea) of Louisiana: An updated, annotated checklist. Proceedings of the Entomological Society of Washington 120 (2):272-307. (distribution).
Prosapis triangularis Cockerell, 1896:31, ♂. ♂, Georgia, exact locality and collector unknown. - Cockerell, 1898Cockerell, T.D.A. 1898. The North American bees of the genus Prosapis. The Entomologist 31:185-192. (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.:1761 ( listed as synonym of Hylaeus confluens (Smith, 1853)). - As Hylaeus triangularis: - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:63 ( listed as synonym of Hylaeus confluens (Smith, 1853)). - As Prosopis triangularis: - Metz, 1911Metz, C.W. 1911. A revision of the genus Prosopis in North America. Transactions of the American Entomological Society 37:85-156.:122 ( listed as synonym of Prosopis modestus (Say, 1837)).