Halictus hartii Robertson, 1892:268, ♀. Holotype ♀, Southern Illinois, Aug. 11 (leg. C.A. Hart). - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution). - As Dialictus hartii: - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538. (distribution), 396 (comb. nov.); 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). - As Lasioglossum hartii: - 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).
Halictus rugosus Crawford, 1902:237, ♂♀. 1 ♀, 2 ♂♂, Nebraska City, Nebr., Sept. 12th, 1901 (leg. M.A. Carriker, Jr.); 3 ♀♀, Nebraska City, Nebr., May 19th, 1901. Synonymized with Dialictus hartii (Robertson, 1892) by Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:396.