Philanthus albopilosus Cresson, 1865:91, ♂. 5 ♂♂, Illinois (Ent. Soc. Philad., leg. Dr. Samuel Lewis). - Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (distribution); Cockerell, 1898Cockerell, T.D.A. 1898. Contributions to the entomology of New Mexico. Proc. Davenport Acad. nat. Sci. 7:139-148. (distribution); Viereck & Cockerell, 1904Viereck, H.L. & Cockerell, T.D.A. 1904. The Philanthinae of New Mexico. - II. Journal of the New York Entomological Society 12 (3):129-146. (distribution); Evans, 1978Evans, H.E. 1978. Observations on the nests and prey of eumenid wasps (Hymenoptera, Eumenidae). Psyche 84:255-259. (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. (distribution); Amarante, 2002Amarante, S.T.P. 2002. A synonymic catalog of the neotropical Crabronidae and Sphecidae (Hymenoptera: Apoidea). Arquivos de Zoologia (São Paulo) 37:1-139. (distribution).
Philanthus simillimus Cresson, 1865:95, ♀. 2 ♀♀, Illinois (Ent. Soc. Philad., leg. Dr. Samuel Lewis). - Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (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.:1721 ( listed as synonym of Philanthus albopilosus Cresson, 1865); Amarante, 2002Amarante, S.T.P. 2002. A synonymic catalog of the neotropical Crabronidae and Sphecidae (Hymenoptera: Apoidea). Arquivos de Zoologia (São Paulo) 37:1-139.:63 ( listed as synonym of Philanthus albopilosus Cresson, 1865).