Prosopis digitata fedorica Cockerell, 1909:27, ♂. ♂, Fedor, Lee County, Texas, March 17, 1909 (leg. Birkmann). - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:73 ( listed as synonym of Hylaeus rudbeckiae (Cockerell & Casad, 1895)). - As Hylaeus fedorica: - 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).
Prosopis grossicornis Swenk & Cockerell, 1910:67, ♂. Holotype ♂, Lincoln, Nebraska, May 14, 1901 (University of Nebraska, leg. L. Bruner); Muma, 1952Muma, M.H. 1952. Insect types in the collections of the University of Nebraska State Museum. Bulletin of the University of Nebraska State Museum 3 (8):1-35.:22, Type ♂ (University of Nebraska State Museum). - Metz, 1911Metz, C.W. 1911. A revision of the genus Prosopis in North America. Transactions of the American Entomological Society 37:85-156. (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.:1767 ( listed as synonym of Hylaeus fedorica (Cockerell, 1909)). - As Hylaeus grossicornis: - 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).