Calliopsis parvus Robertson, 1892:273, ♂♀. 3 ♀♀, 1 ♂, Illinois, May 28. - As Calliopsis parva: - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution). - As Heterosarus parvus: - 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 Pseudopanurgus parvus: - Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538. (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).
Pseudopanurgus geradiae Crawford, 1932:77 - Michener, 1947Michener, C.D. 1947. Bees of a limited area in southern Mississippi (Hymenoptera; Apoidea). The American Midland Naturalist 38 (2):443-455. (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.:1855 ( listed as synonym of Heterosarus parvus (Robertson, 1892)).
Pseudopanurgus stevensi Crawford, 1932:78 - Timberlake, 1964Timberlake, P.H. 1964. Some new species of Pseudopanurgus of the subgenus Heterosarus Robertson (Hymenoptera, Apoidea). American Museum Novitates 2185:1-26. (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.:1855 ( listed as synonym of Heterosarus parvus (Robertson, 1892)).
Panurginus borealis Cockerell, 1937:33 - Timberlake, 1964Timberlake, P.H. 1964. Some new species of Pseudopanurgus of the subgenus Heterosarus Robertson (Hymenoptera, Apoidea). American Museum Novitates 2185:1-26.:25 ( listed as synonym of Pseudopanurgus stevensi Crawford, 1932); 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.:1855 ( listed as synonym of Heterosarus parvus (Robertson, 1892)).