Megachile onobrychidis Cockerell, 1908:266, ♂. Holotype ♂, Mesilla Park, New Mexico, April 25, 1895 (leg. W.P. Cockerell); Mitchell, 1935Mitchell, T.B. 1935. A revision of the genus Megachile in the Nearctic Region. Part II. Morphology of the male sternites and genital armature and the taxonomy of the subgenera Litomegachile, Neomegachile and Cressoniella (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 61 (1):1-44.:19, Type ♂ (Cockerell); Bzdyk, 2012Bzdyk, E.L. 2012. A revision of the Megachile subgenus Litomegachile Mitchell with an illustrated key and description of a new species (Hymenoptera, Megachilidae, Megachilini). ZooKeys 221:31-61.:50, Holotype ♂ (CAS). - Cockerell, 1935Cockerell, T.D.A. 1935. New records of bees. American Museum Novitates 766:1-8. (distribution); Bzdyk, 2012Bzdyk, E.L. 2012. A revision of the Megachile subgenus Litomegachile Mitchell with an illustrated key and description of a new species (Hymenoptera, Megachilidae, Megachilini). ZooKeys 221:31-61. (distribution); Sheffield & Genaro, 2013Sheffield, C.S. & Genaro, J.A. 2013. A new species of Megachile (Litomegachile) from Cuba, the Antilles (Hymenoptera: Megachilidae). Journal of Melittology 19:1-17. (distribution); Esperanza de Pedro, 2021Esperanza de Pedro, D. 2021. . :. (distribution). - As Megachile brevis onobrychidis: - Mitchell, 1935Mitchell, T.B. 1935. A revision of the genus Megachile in the Nearctic Region. Part II. Morphology of the male sternites and genital armature and the taxonomy of the subgenera Litomegachile, Neomegachile and Cressoniella (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 61 (1):1-44. (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).