Halictus sisymbrii Cockerell, 1895:63, ♀. ♀, College Farm, Las Cruces, N.M., April 16, 1895 (leg. Ckll.), Lectotype ♀, examined (U.S.N.M., No. 3390), designated by McGinley, 1986McGinley, R.J. 1986. Studies of Halictinae (Apoidea: Halicitidae), I. Revision of the New World Lasioglossum Curtis. Smithsonian Contributions to Zoology 429:1-294.:222. - Cockerell, 1898Cockerell, T.D.A. 1898. The insect visitors of flowers in New Mexico. - I. Zoologist ser .4: v. 2:78-81. (distribution); Cockerell, 1898Cockerell, T.D.A. 1898. New and little-known bees. The Canadian Entomologist 30:50-53. (distribution); Cockerell, 1899Cockerell, T.D.A. 1899. Notes on some Hymenoptera. The Canadian Entomologist 31:255-256. (distribution); Cockerell, 1901Cockerell, T.D.A. 1901. Contributions from the New Mexico Biological Station. - X. Observations on bees collected at Las Vegas, New Mexico, and in the adjacent Mountains. II. The Annals and Magazine of Natural History ser. 7: v. 7:125-131. (distribution); Cockerell, 1901Cockerell, T.D.A. 1901. Flower and insect records from New Mexico. Entomological News 12 (2):38-43. (distribution); Cockerell, 1906Cockerell, T.D.A. 1906. The bees of Florissant, Colorado. Bull. American Mus. Nat. Hist. 22:419-455. (distribution); Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Cockerell, 1907Cockerell, T.D.A. 1907. The bees of Boulder County, Colorado. University of Colorado Studies 4:239-259. (distribution); Cockerell, 1908Cockerell, T.D.A. 1908. Some bees of the genus Halictus. Proceedings of the Entomological Society of Washington 9:119-120. (distribution); Cockerell, 1911Cockerell, T.D.A. 1911. Descriptions and records of bees. - XXXIX. The Annals and Magazine of Natural History ser. 8: v. 8 (47):660-673. (distribution); Cockerell, 1930Cockerell, T.D.A. 1930. Bees from Mesa Verde, Colorado, in the American Museum of Natural History. American Museum Novitates 397:1-8. (distribution); Cockerell, 1934Cockerell, T.D.A. 1934. Records of Western bees. American Museum Novitates 697:1-15. (distribution); Cockerell, 1937Cockerell, T.D.A. 1937. Bees collected in Arizona and California in the spring of 1937. American Museum Novitates 948:1-15. (distribution); Cockerell, 1941Cockerell, T.D.A. 1941. Observations on plants and insects in northwestern Baja California, Mexico, with descriptions of new bees. Trans. San Diego Soc. Nat. Hist. 9 (31):337-352. (distribution). - As Halictus sisimbrii: - Cockerell, 1897Cockerell, T.D.A. 1897. The bees of the genus Halictus found in New Mexico. I. Species without any green or blue. Transactions of the American Entomological Society 24:163-168. (distribution). - As Lasioglossum sisymbrii: - 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); McGinley, 1986McGinley, R.J. 1986. Studies of Halictinae (Apoidea: Halicitidae), I. Revision of the New World Lasioglossum Curtis. Smithsonian Contributions to Zoology 429:1-294. (distribution); Linsley, 1988Linsley, E.G. 1988. Further notes on halictine bees (Hymenoptera: Apoidea) visiting Isomeris arborea in southern California. The Pan-Pacific Entomologist 64 (3):275-279. (distribution); Ruíz-Cancino & Coronado-Blanco, 2002Ruíz-Cancino, E. & J.M. Coronado-Blanco 2002. Artrópodos terrestres de los estados de Tamaulipas y Nuevo León, México. Serie Publicaciones Cientificas No. 4:1-376. (distribution); Wilson et al., 2010Wilson, J.S., L.E. Wilson, L.D. Loftis & T. Griswold 2010. The montane bee fauna of north central Washington, USA, with floral associations. Western North American Naturalist 70 (2):198-207. (distribution); Esperanza de Pedro, 2021Esperanza de Pedro, D. 2021. . :. (distribution); Nava-Bolaños & Osorio-Olvera, 2022Nava-Bolaños, A. & L. Osorio-Olvera 2022. Estado del arte del conocimiento de biodiversidad de los polinizadores de México. Revista Mexicana de Biodiversidad 93:1-77. (distribution).
Halictus olympyiae subangustus Cockerell, 1898:51, ♀. ♀, Olympia, Washington State, June 26, 1896 (leg. T. Kincaid); McGinley, 1986McGinley, R.J. 1986. Studies of Halictinae (Apoidea: Halicitidae), I. Revision of the New World Lasioglossum Curtis. Smithsonian Contributions to Zoology 429:1-294.:222, Holotype ♀ (National Museum of Natural History, Smithsonian Institution). Synonymized with Lasioglossum sisymbrii (Cockerell, 1895) by McGinley, 1986McGinley, R.J. 1986. Studies of Halictinae (Apoidea: Halicitidae), I. Revision of the New World Lasioglossum Curtis. Smithsonian Contributions to Zoology 429:1-294.:222.