Alcidamea pilosifrons Cresson, 1864:386, ♂. Holotype ♂, Connecticut (E. Norton). - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution). - As Hoplitis pilosifrons: - Michener, 1947Michener, C.D. 1947. A revision of the american species of Hoplitis (Hymenoptera, Megachilidae). Bulletin of the American Museum of Natural History 89:257-318. (distribution); Michener, 1949Michener, C.D. 1949. Records and descriptions of american Megachilid bees (Hymenoptera). Journal of the Kansas Entomological Society 22 (2):41-59. (distribution); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557. (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, 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); 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).
Hoplitis graceae Cockerell, 1923:263, ♀. ♀, Sterling, Colorado, July 1, 1921 (leg. Grace Sandhouse). - Michener, 1947Michener, C.D. 1947. A revision of the american species of Hoplitis (Hymenoptera, Megachilidae). Bulletin of the American Museum of Natural History 89:257-318.:283 ( listed as synonym of Hoplitis pilosifrons (Cresson, 1864)); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:61 ( listed as synonym of Hoplitis pilosifrons (Cresson, 1864)); 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.:2017 ( listed as synonym of Hoplitis pilosifrons (Cresson, 1864)).
Alcidamea simplex Robertson, 1929 - Cockerell, 1903Cockerell, T.D.A. 1903. A catalogue of the bees of California. Psyche 10:74-78. (distribution); Cockerell, 1907Cockerell, T.D.A. 1907. The bees of Boulder County, Colorado. University of Colorado Studies 4:239-259. (distribution); Cockerell, 1911Cockerell, T.D.A. 1911. Descriptions and records of bees. - XL. The Annals and Magazine of Natural History ser. 8: v. 8 (48):763-770. (distribution); Michener, 1947Michener, C.D. 1947. A revision of the american species of Hoplitis (Hymenoptera, Megachilidae). Bulletin of the American Museum of Natural History 89:257-318.:283 ( listed as synonym of Hoplitis pilosifrons (Cresson, 1864)), 289 ( listed as synonym of Hoplitis producta producta (Cresson, 1864)); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:61 ( listed as synonym of Hoplitis pilosifrons (Cresson, 1864)).
Alcidamea mucronata Cockerell, 1934:18 - Michener, 1947Michener, C.D. 1947. A revision of the american species of Hoplitis (Hymenoptera, Megachilidae). Bulletin of the American Museum of Natural History 89:257-318.:283 ( listed as synonym of Hoplitis pilosifrons (Cresson, 1864)); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:61 ( listed as synonym of Hoplitis pilosifrons (Cresson, 1864)); 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.:2017 ( listed as synonym of Hoplitis pilosifrons (Cresson, 1864)).