Halictus parallelus Smith - Robertson, 1893Robertson, C. 1893. Notes on bees, with descriptions of new species. Transactions of the American Entomological Society 20:145-149.:146 ( listed as synonym of Halictus lerouxii Lepeletier, 1841).
Apis rubicunda Christ, 1791:190, Sandhouse, 1941Sandhouse, G.A. 1941. The american bees of the subgenus Halictus. Entomologica Americana 21:23-38 + 1 pl.:30, not located. - Kuhlmann, Kuhlmann, M. . in lit. :. (listed); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398.:66 (listed). - As Halictus rubicundus: - Kuhlmann, Kuhlmann, M. . in lit. :. (listed); Sandhouse, 1941Sandhouse, G.A. 1941. The american bees of the subgenus Halictus. Entomologica Americana 21:23-38 + 1 pl. (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); 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); Pagliano, 1995Pagliano, G. 1995. Hymenoptera Apoidea. In: Minelli A., Ruffo S. & La Posta S. (Ed.). Checklist delle specie della fauna italiana. 1-25. (distribution); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398. (distribution), 66 (listed); Fowles, A.P., 1996Fowles, A.P. 1996. A provisional checklist of the invertebrates recorded from Wales. 2. Aculeate wasps, bees and ants (Hymenoptera: Aculeata). 1-57. (distribution); Banaszak, 2000Banaszak, J. 2000. A checklist of the bee species (Hymenoptera, Apoidea) of Poland with remarks on their taxonomy and zoogeography: revised version. Fragmenta Faunistica 43 (14):135-193. (distribution); Michener, 2000Michener, C.D. 2000. The Bees of the World. The John Hopkins University Press, Baltimore and London. 1-913. (distribution); Mayer et al., 2000Mayer, D.F., E.R. Miliczky, B.F. Finnigan & C.A. Johansen 2000. The bee fauna (Hymenoptera: Apoidea) of southeastern Washington. Journal of the Entomological Society of British Columbia 97:25-32. (distribution); Amiet et al., 2001Amiet, F., M. Herrmann, A. Müller & R. Neumeyer 2001. Apidae 3 - Halictus, Lasioglossum. 1-208.:31 (listed); Dathe, H.H., 2001Dathe, H.H. 2001. Apidae. In: Dathe, H., A. Taeger & S.M. Blank (Ed.). Verzeichnis der Hautflügler Deutschlands (Entomofauna Germanica, Band 4). 143-155. (distribution), 148 (distribution); Bieri, 2002Bieri, S. 2002. Bienen und Wespen des Fürstentums Liechtenstein. 1-160. (distribution); Ortiz-Sánchez, F.J., 2006Ortiz-Sánchez, F.J. 2006. Lista preliminar de los Apoidea (Hymenoptera) de Andalucia (sur de la Penínscula Ibérica). Acta Granatense 4/5:17-39. (distribution); Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution); Straka et al., 2007Straka, J., P. Bogusch & A. Pridal 2007. Apoidea: Apiformes (včely). In: Bogusch, P., J. Straka & P. Kment (Ed.). Annotated checklist of the Aculeata (Hymenoptera) of the Czech Republic and Slovakia. 241-299. (distribution); Gogala, 2009Gogala, A. 2009. Bee fauna of Slovenia: checklist of species (Hymenoptera: Apoidea). . (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); Tomozei, B., 2012Tomozei, B. 2012. Bees of Romania. . (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 Halictus rubicundus rubicundus: - Rasmont et al., 1995Rasmont, P., P.A. Ebmer, J. Banaszak & G. van der Zanden 1995. Hymenoptera Apoidea Gallica. Bulletin de la Société entomologique de France 100 (hors série):1-98. (distribution).
Halictus nidulans Walckenaer, 1817 - Kuhlmann, Kuhlmann, M. . in lit. :. ( listed as synonym of Halictus rubicundus (Christ, 1791)); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398.:66 ( listed as synonym of Halictus rubicundus (Christ, 1791)).
Halictus lerouxii Lepeletier, 1841:272, ♀. ♀, Amérique septentrionale (Musée de M. Serville, leg. M. Leroux); Sandhouse, 1941Sandhouse, G.A. 1941. The american bees of the subgenus Halictus. Entomologica Americana 21:23-38 + 1 pl.:30, Type ('Musée de M. Serville'). - Kuhlmann, Kuhlmann, M. . in lit. :. ( listed as synonym of Halictus rubicundus (Christ, 1791)); 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 american bees. The Entomologist 32:128-129. (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, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (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, 1910Cockerell, T.D.A. 1910. Some bees from Eldora, Colorado. Psyche 17 (6):244-247. (distribution); Cockerell, 1919Cockerell, T.D.A. 1919. The bees of Gold Hill, Colorado. The Canadian Entomologist 51:271-273. (distribution); Cockerell, 1919Cockerell, T.D.A. 1919. The bees of the Rocky Mountain National Park (Hymenop.). Entomological News and Proceedings of the Entomological Section of the Academy of Natural Sciences of Philadelphia 30 (10):286-294. (distribution); Cockerell, 1928Cockerell, T.D.A. 1928. Some bees from Utah. Psyche 35 (4):232-234. (distribution); Cockerell, 1934Cockerell, T.D.A. 1934. Records of Western bees. American Museum Novitates 697:1-15. (distribution); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:336 ( listed as synonym of Halictus rubicundus (Christ, 1791)); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398.:66 ( listed as synonym of Halictus rubicundus (Christ, 1791)). - As Halictus lerouxi: - Cockerell, 1906Cockerell, T.D.A. 1906. The bees of Florissant, Colorado. Bull. American Mus. Nat. Hist. 22:419-455. (distribution); Cockerell, 1907Cockerell, T.D.A. 1907. The bees of Boulder County, Colorado. University of Colorado Studies 4:239-259. (distribution); Michener, 1936Michener, C.D. 1936. On certain Halictidae from Northern California. The Pan Pacific Entomologist 12 (4):165-172. (distribution); Sandhouse, 1941Sandhouse, G.A. 1941. The american bees of the subgenus Halictus. Entomologica Americana 21:23-38 + 1 pl.:28 ( listed as synonym of Halictus rubicundus (Christ, 1791)); 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.:1955 ( listed as synonym of Halictus rubicundus (Christ, 1791)).
Halictus quadrifasciatus Smith, 1870 - Kuhlmann, Kuhlmann, M. . in lit. :. ( listed as synonym of Halictus rubicundus (Christ, 1791)); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398.:66 ( listed as synonym of Halictus rubicundus (Christ, 1791)); Amiet et al., 2001Amiet, F., M. Herrmann, A. Müller & R. Neumeyer 2001. Apidae 3 - Halictus, Lasioglossum. 1-208.:31 ( listed as synonym of Halictus rubicundus (Christ, 1791)).
Halictus lerouxii ruborum Cockerell, 1898:52, ♀. ♀, Seattle, Washington State, May 14 (leg. T. Kincaid); Sandhouse, 1941Sandhouse, G.A. 1941. The american bees of the subgenus Halictus. Entomologica Americana 21:23-38 + 1 pl.:30, Type (Cockerell's collections). Synonymized with Halictus rubicundus (Christ, 1791) by Sandhouse, 1941Sandhouse, G.A. 1941. The american bees of the subgenus Halictus. Entomologica Americana 21:23-38 + 1 pl.:29. - Kuhlmann, Kuhlmann, M. . in lit. :. ( listed as synonym of Halictus rubicundus (Christ, 1791)); Cockerell, 1934Cockerell, T.D.A. 1934. Records of Western bees. American Museum Novitates 697:1-15. (distribution); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:336 ( listed as synonym of Halictus rubicundus (Christ, 1791)); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398.:66 ( listed as synonym of Halictus rubicundus (Christ, 1791)). - As Halictus lerouxi ruborum: - 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. Some bees from western Canada. The Canadian Entomologist 43 (1):33-34. (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.:1955 ( listed as synonym of Halictus rubicundus (Christ, 1791)).
Halictus rubicundus nesiotis Perkins, 1922 - Kuhlmann, Kuhlmann, M. . in lit. :. ( listed as synonym of Halictus rubicundus (Christ, 1791)).
Halictus rubicundus laticinctus Blüthgen, 1923 - Kuhlmann, Kuhlmann, M. . in lit. :. ( listed as synonym of Halictus rubicundus (Christ, 1791)); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398.:66 ( listed as synonym of Halictus rubicundus (Christ, 1791)).
Halictus lupinelli Cockerell, 1936:158, ♀. Holotype ♀, Garberville (leg. Cockerell); Sandhouse, 1941Sandhouse, G.A. 1941. The american bees of the subgenus Halictus. Entomologica Americana 21:23-38 + 1 pl.:30, Type (California Academy of Sciences). Synonymized with Halictus rubicundus (Christ, 1791) by Sandhouse, 1941Sandhouse, G.A. 1941. The american bees of the subgenus Halictus. Entomologica Americana 21:23-38 + 1 pl.:29. - Kuhlmann, Kuhlmann, M. . in lit. :. ( listed as synonym of Halictus rubicundus (Christ, 1791)); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:336 ( listed as synonym of Halictus rubicundus (Christ, 1791)); 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.:1955 ( listed as synonym of Halictus rubicundus (Christ, 1791)); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398.:66 ( listed as synonym of Halictus rubicundus (Christ, 1791)); Amiet et al., 2001Amiet, F., M. Herrmann, A. Müller & R. Neumeyer 2001. Apidae 3 - Halictus, Lasioglossum. 1-208.:31 ( listed as synonym of Halictus rubicundus (Christ, 1791)).
Halictus rubicundus mongolensis Blüthgen, 1936 - Kuhlmann, Kuhlmann, M. . in lit. :. ( listed as synonym of Halictus rubicundus (Christ, 1791)); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398.:66 ( listed as synonym of Halictus rubicundus (Christ, 1791)).
Halictus frater Pesenko, 1984 - Kuhlmann, Kuhlmann, M. . in lit. :. ( listed as synonym of Halictus rubicundus (Christ, 1791)); Schwarz et al., 1996Schwarz, M., F. Gusenleitner, P. Westrich & H. Dathe 1996. Katalog der Bienen Österreichs, Deutschlands und der Schweiz (Hymenoptera, Apidae). Entomofauna Suppl. 8:1-398.:66 ( listed as synonym of Halictus rubicundus (Christ, 1791)); Amiet et al., 2001Amiet, F., M. Herrmann, A. Müller & R. Neumeyer 2001. Apidae 3 - Halictus, Lasioglossum. 1-208.:31 ( listed as synonym of Halictus rubicundus (Christ, 1791)).