Hypomacrotera callops Cockerell & Porter, 1899:419, ♂♀. Cockerell & Porter, 1899Cockerell, T.D.A. & W. Porter 1899. Contributions from the New Mexico Biological Station. - VII Observations on bees, with descriptions of new genera and species. The Annals and Magazine of Natural History ser. 7: v. 4:403-421.:420, ♂♀, Las Vegas, New Mexico, Aug. 1 to 4 (leg. Cockerell & W. Porter); Danforth, 1994Danforth, B.N. 1994. Taxonomic review of Calliopsis subgenus Hypomacrotera (Hymenoptera: Andrenidae), with special emphasis on the distributions and host plant associations. The Pan-Pacific Entomologist 70 (4):283-300.:287, Holotype ♂ (American Museum of Natural History, New York). - Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Cockerell, 1921Cockerell, T.D.A. 1921. Western bees obtained by the American Museum expeditions. American Museum Novitates 24:1-15. (distribution). - As Hypomacrotera callops callops: - 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 Calliopsis callops: - Danforth, 1994Danforth, B.N. 1994. Taxonomic review of Calliopsis subgenus Hypomacrotera (Hymenoptera: Andrenidae), with special emphasis on the distributions and host plant associations. The Pan-Pacific Entomologist 70 (4):283-300. (distribution); Yáñez-Ordóñez & Hinojosa-Díaz, 2004Yáñez-Ordóñez, O. & I. Hinojosa-Díaz 2004. La colección himenopterológica (Insecta) del Museo de Zoología Alfonso L. Herrera de la Facultad de Ciencias, UNAM, México. Acta Zoológica Mexicana (nueva serie) 20 (1):167-197. (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).