Hylaeus formosus Krombein, 1953:19, ♀. Holotype ♀, Easter Cay, Bahamas, June, 1951 (American Museum of Natural History, leg. M. Cazier & P. Vaurie). - 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); Urban & Moure, 2002Urban, D. & J.S. Moure 2002. Catálogo de Apoidea de Região Neotropical (Hymenoptera, Colletidae). IV. Hylaeinae. Revista Brasileira de Entomologia 19 (1):31-56. (distribution); Portuondo Ferrer & Fernández Triana, 2004Portuondo Ferrer, E. & J.L. Fernández Triana 2004. Biodiversidad del orden Hymenoptera en los macizos montañosos de Cuba oriental. Boletín de la Sociedad Entomológica Aragonesa 35:121-136. (distribution); Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution); Genaro, 2016Genaro, J.A. 2016. Especies nuevas y nuevos registros de abejas para las Antillas (Hymenoptera: Anthophila; Colletidae, Halictidae). Novitates Caribaea 10:38-51. (distribution); Gibbs, 2020Gibbs, J. 2020. Hylaeus (Hylaeana) dominicalis, a new species and the first colletid bee recorded from Dominica, Lesser Antilles (Hymenoptera: Colletidae: Hylaeinae). Journal of Melittology 93:1-6. (distribution); Breto, 2021Breto Benítez, D. 2021. Inventario de abejas y avispas apoideas (Hymenoptera, Apoidea) del Parque Nacional Guanahacabibes, Pinar del Río, Cuba. Ecovida 1:20-28. (distribution).
Hylaeus metopii Mitchell, 1960:80, ♀. Holotype ♀, Key Largo, Fla., April 10, 1955 (Mitchell, leg. T.B. Mitchell). - 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.:1769 ( listed as synonym of Hylaeus formosus Krombein, 1953); Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . ( listed as synonym of Hylaeus formosus Krombein, 1953); Genaro, 2016Genaro, J.A. 2016. Especies nuevas y nuevos registros de abejas para las Antillas (Hymenoptera: Anthophila; Colletidae, Halictidae). Novitates Caribaea 10:38-51.:48 ( listed as synonym of Hylaeus formosus Krombein, 1953).