Prosopis pygmæa Cresson, 1869:272, ♂. ♂, Illinois (Am. Ent. Soc.). - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution); Cockerell, 1906Cockerell, T.D.A. 1906. The bees of Florissant, Colorado. Bull. American Mus. Nat. Hist. 22:419-455. (distribution); Lovell, 1909Lovell, J.H. 1909. The bees of Virginia - Prosopis, Sphecodes, Osmia. Entomological News 20:412-417. (distribution); Metz, 1911Metz, C.W. 1911. A revision of the genus Prosopis in North America. Transactions of the American Entomological Society 37:85-156.:105 ( listed as synonym of Prosopis cressoni Cockerell, 1907); 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 mesillae cressoni (Cockerell, 1907)). - As Prosapis pygmaea: - Cockerell, 1898Cockerell, T.D.A. 1898. The North American bees of the genus Prosapis. The Entomologist 31:185-192. (distribution).
Prosapis labiatifrons Cockerell, 1896:437, ♂. ♂, Georgia (Coll. Amer. Ent. Soc.). - Cockerell, 1898Cockerell, T.D.A. 1898. The North American bees of the genus Prosapis. The Entomologist 31:185-192. (distribution). - As Prosopis labiatifrons: - Metz, 1911Metz, C.W. 1911. A revision of the genus Prosopis in North America. Transactions of the American Entomological Society 37:85-156.:105 ( listed as synonym of Prosopis cressoni Cockerell, 1907).
Prosopis Cressoni Cockerell, 1907:131, no description Replacement name for Prosopis pygmaea Cresson, 1869 by Cockerell, 1907Cockerell, T.D.A. 1907. Descriptions and records of bees. - XVI. The Annals and Magazine of Natural History ser. 7: v. 20 (116):122-132.:131. - Cockerell, 1911Cockerell, T.D.A. 1911. Records of bees. The Canadian Entomologist 43 (11):389-391. (distribution). - As Hylaeus cressoni: - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538. (distribution). - As Hylaeus mesillae cressoni: - 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 pasadenae Cockerell, 1910:30, ♂♀.Pasadena, California, April 8 to May 31 (leg. F. Grinnell, Jr.);near Pasadena, at 1100 ft., July 21 (leg. F. Grinnell, Jr.). - Metz, 1911Metz, C.W. 1911. A revision of the genus Prosopis in North America. Transactions of the American Entomological Society 37:85-156.:105 ( listed as synonym of Prosopis cressoni Cockerell, 1907); 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 mesillae cressoni (Cockerell, 1907)).
Prosopis telepora Lovell, 1911:213 - 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 mesillae cressoni (Cockerell, 1907)).
Hylaeus laciniatus Cockerell & Sumner, 1931:9, ♂. ♂, Colorado, Boulder, May 24, 1913 (leg. F.E. Lutz). - 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 mesillae cressoni (Cockerell, 1907)).
Hylaeus repolitus Cockerell & Sumner, 1931:13, ♀. ♀, Utah, Ogden, alt. about 4300 ft., July 25, 1920 (leg. F.E. Lutz). - 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 mesillae cressoni (Cockerell, 1907)).