Phileremus illinoiensis Robertson, 1891:64, ♂♀. 3 ♀♀, 9 ♂♂, Carlinville, Ill., August 14th and 23d (leg. Robertson). - As Holcopasites illinoiensis: - Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557. (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 Holcopasites illinoiensis illinoiensis: - 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 Phileremus illinoiensis illinoiensis:
Holcopasites pratti Ashmead in Crawford, 1915:123 - 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.:2086 ( listed as synonym of Holcopasites illinoiensis illinoiensis (Robertson, 1891)).
Neopasites punctulatus Linsley, 1943:135 Synonymized with Holcopasites illinoiensis (Robertson, 1891) by Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:483. - 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.:2086 ( listed as synonym of Holcopasites illinoiensis illinoiensis (Robertson, 1891)).