Halictus tegulariformis Crawford, 1907:194, Gardner & Gibbs, 2023Gardner, J. & J. Gibbs 2023. Revision of the Nearctic species of the Lasioglossum (Dialictus) gemmatum species complex (Hymenoptera: Halictidae). European Journal of Taxonomy 858:1-222.:182, Holotype ♀ (USNM). - Cockerell, 1916Cockerell, T.D.A. 1916. Sunflower insects in California and South Africa. The Canadian Entomologist 48:76-79. (distribution); Sandhouse & Cockerell, 1924Sandhouse, G. & T.D.A. Cockerell 1924. Expedition of the California Academy of Sciences to the Gulf of California in 1921. The bees (III). Proceedings of the California Academy of Sciences ser. 4: v. 13 (21):333-339. (distribution); Michener, 1937Michener, C.D. 1937. Records and descriptions of North American bees. The Annals and Magazine of Natural History ser. 10 (19):313-329, 393-410. (distribution). - As Dialictus tegulariformis: - 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 tegulariforme: - 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); Gardner & Gibbs, 2023Gardner, J. & J. Gibbs 2023. Revision of the Nearctic species of the Lasioglossum (Dialictus) gemmatum species complex (Hymenoptera: Halictidae). European Journal of Taxonomy 858:1-222. (distribution).
Halictus helianthi Cockerell, 1916:77, ♀. Holotype ♀, Orange, California, August 16th, 1915 (leg. Cockerell). - Michener, 1936Michener, C.D. 1936. On certain Halictidae from Northern California. The Pan Pacific Entomologist 12 (4):165-172. (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); 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.:1972 ( listed as synonym of Dialictus tegulariformis (Crawford, 1907)).