Hylaeus modéstus Say, 1837:392, ♂♀.no location. - Cockerell & Sumner, 1931Cockerell, T.D.A. & R. Sumner 1931. Rocky Mountain bees. III. American Museum Novitates 490:1-15. (distribution); Michener, 1947Michener, C.D. 1947. Bees of a limited area in southern Mississippi (Hymenoptera; Apoidea). The American Midland Naturalist 38 (2):443-455. (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); 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). - As Hylaeus modestus modestus: - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538. (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); Hall & Ascher, 2011Hall, H.G., & J.S. Ascher 2011. Surveys of wild bees (Hymenoptera: Apoidea: Anthophila) in organic farms of Alachua County in north-central Florida. The Florida Entomologist 94 (3):539-552. (distribution). - As Prosopis modestus: - Metz, 1911Metz, C.W. 1911. A revision of the genus Prosopis in North America. Transactions of the American Entomological Society 37:85-156. (distribution).
Prosopis affinis Cresson, 1869:270, ♂♀.Ct., N. Y., Pa., Va., Ill., Col. Ter. (Am. Ent. Soc.). - Cresson, 1869Cresson, E.T. 1869. Description of North American bees. No. 2. Proceedings of the Boston Society of Natural History 12:269-274. (distribution); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:65 ( listed as synonym of Hylaeus modestus modestus Say, 1837).
Prosapis pennsylvanica Cockerell, 1896:439, ♂. ♂, Montgomery Co., Pa., May 28, 1890 (U. S. Natl. Museum); ♂, Virginia, June 27, 1880 (leg. C.V. Riley). - 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.:1762 ( listed as synonym of Hylaeus modestus modestus Say, 1837). - As Prosopis pennsylvanica: - Metz, 1911Metz, C.W. 1911. A revision of the genus Prosopis in North America. Transactions of the American Entomological Society 37:85-156.:121 ( listed as synonym of Prosopis modestus (Say, 1837)); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:65 ( listed as synonym of Hylaeus modestus modestus Say, 1837).
Prosopis citrinifrons Cockerell, 1896:27 - Metz, 1911Metz, C.W. 1911. A revision of the genus Prosopis in North America. Transactions of the American Entomological Society 37:85-156.:121 ( listed as synonym of Prosopis modestus (Say, 1837)). - As Hylaeus modestus citrinifrons: - Snelling, 1966Snelling, R.R. 1966. Studies on North American bees of the genus Hylaeus. 1. Distribution of the western species of the subgenus Prosopis with descriptions of new forms (Hymenoptera: Colletidae). Contributions in Science, Natural History Museum Los Angeles County 98:1-18. (distribution).
Prosopis nucleolus Viereck, 1903:64 - Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:65 ( listed as synonym of Hylaeus modestus modestus Say, 1837); 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 modestus modestus Say, 1837).
Prosopis sayi Robertson, 1904:274 - 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)); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:65 ( listed as synonym of Hylaeus modestus modestus Say, 1837); 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 modestus modestus Say, 1837).
Prosopis minyra Lovell, 1909:413 - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:66 ( listed as synonym of Hylaeus modestus modestus Say, 1837); 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 modestus modestus Say, 1837).
Prosopis binghami Lovell, 1910:180 Synonymized with Hylaeus modestus modestus Say, 1837 by Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:66. - 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 modestus modestus Say, 1837).
Prosopis supracurta Swenk & Cockerell, 1910:71 - 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)); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:66 ( listed as synonym of Hylaeus modestus modestus Say, 1837); 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 modestus modestus Say, 1837).