Melissodes bombiformis Cresson, 1878:219, ♂♀. 6 ♂♀, Virginia, Georgia, Kansas (American Entomology Society); Flórez-Gómez & Danforth, 2023Flórez-Gómez, N. & B. Danforth 2023. The North American bees of the genus Ptilothrix Cresson, 1878 (Hymenoptera, Apidae, Emphorini), with the description of two new species. Journal of Hymenoptera Research 95:275-293.:289, Lectotype ♀ (ANSP). - Cresson, 1878Cresson, E.T. 1878. Descriptions of new species of North American bees. Proceedings of the Entomological Society of Philadelphia 30:181-221. (distribution). - As Ancyloscelis bombiformis: - Friese, 1910Friese, H. 1910. Neue Bienenarten aus Süd-Amerika. Deutsche Entomologische Zeitschrift 1910:693-711. (distribution). - As Emphor bombiformis: - Cockerell, 1906Cockerell, T.D.A. 1906. The North American bees of the family Anthophoridae. Transactions of the American Entomological Society 32:63-116. (distribution); Cockerell, 1910Cockerell, T.D.A. 1910. New and little-known bees. Transactions of the American Entomological Society 36:199-249. (distribution); Grossbeck, 1911Grossbeck, J.A. 1911. A contribution toward the life history of Emphor bombiformis Cress. Journal of the New York Entomological Society 19:238-244. (biology, distribution); Lutz & Cockerell, 1920Lutz, F.E. & T.D.A. Cockerell 1920. Notes on the distribution and bibliography of North American bees of the families, Apidae, Meliponidae, Bombidae, Euglossidae, and Anthophoridae. Bull. Amer. Mus. Nat. Hist 42 (15):491-641. (distribution); Michener, 1947Michener, C.D. 1947. Bees of a limited area in southern Mississippi (Hymenoptera; Apoidea). The American Midland Naturalist 38 (2):443-455. (distribution). - As Eucera bombiformis: - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution), 227 (comb. nov.). - As Ptilothrix bombiformis: - Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557. (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); Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (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); 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); Flórez-Gómez & Danforth, 2023Flórez-Gómez, N. & B. Danforth 2023. The North American bees of the genus Ptilothrix Cresson, 1878 (Hymenoptera, Apidae, Emphorini), with the description of two new species. Journal of Hymenoptera Research 95:275-293. (distribution).
Emphor fuscojubatus Cockerell, 1913:107 Synonymized with Ptilothrix bombiformis (Cresson, 1878) by Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:240. - 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.:2119 ( listed as synonym of Ptilothrix bombiformis (Cresson, 1878)).