Prosapis Schwarzii Cockerell, 1896:218, ♀. Holotype ♀, Dade Co., Florida (U. S. N. M., No. 19113, leg. E.A. Schwarz). - Cockerell, 1898Cockerell, T.D.A. 1898. The North American bees of the genus Prosapis. The Entomologist 31:185-192. (distribution). - As Hylaeus schwarzii: - 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); Hall & Ascher, 2010Hall, H.G., & J.S. Ascher 2010. Surveys of bees (Hymenoptera: Apoidea: Anthophila) in natural areas of Alachua County in North-Central Florida. The Florida Entomologist 93 (4):609-629. (distribution). - As Prosopis schwarzii:
Prosopis fossata Metz, 1911:135, ♂♀. Holotype ♂, Louisiana (collection of C.F. Baker, No. 2336). - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:68 ( listed as synonym of Hylaeus schwarzii (Cockerell, 1896)); 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.:1763 ( listed as synonym of Hylaeus schwarzii (Cockerell, 1896)).