Halictus 4-maculatus Robertson, 1890:316 - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:353 ( listed as synonym of Evylaeus macoupinensis (Robertson, 1900)). - As Halictus quadrimaculatus: - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (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.:1960 ( listed as synonym of Evylaeus macoupinensis (Robertson, 1900)).
Halictus macoupinensis Robertson, 1900:48, ♀. 2 ♀♀, Carlinville, Illinois. - Robertson, 1895Robertson, C. 1895. Notes on bees, with descriptions of new species. Transactions of the American Entomological Society 22 (2):115-128. (distribution); Robertson, 1897Robertson, C. 1897. North American bees - Descriptions and synonyms. Transactions of the Academy of Science of St. Louis 7 (14):315-356.:321 ( listed as synonym of Halictus 4-maculatus Robertson, 1890). - As Evylaeus macoupinensis: - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538. (distribution), 353 (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 macoupensis: - Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution). - As Lasioglossum macoupensis: - Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution). - As Lasioglossum macoupinense: - Hall & Ascher, 2010Hall, H.G., & J.S. Ascher 2010. Surveys of bees (Hymenoptera: Apoidea: Anthophila) in natural areas of Alachua County in North-Central Florida. The Florida Entomologist 93 (4):609-629. (distribution); Hall & Ascher, 2011Hall, H.G., & J.S. Ascher 2011. Surveys of wild bees (Hymenoptera: Apoidea: Anthophila) in organic farms of Alachua County in north-central Florida. The Florida Entomologist 94 (3):539-552. (distribution).