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 (1):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, ♀. 3 ♀♀, Cape May Pt., N. J., Aug. 25, 1912 (leg. Louise Nichols). 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)).