Ashmeadiella breviceps Michener, 1939:77, ♂♀. Allotype ♂, Dos Palmos, Colorado Desert, California, March 19, 1934 (Calif. Acad. Sci., Ent., No. 4747, leg. Cazier); Holotype ♀, Cathedral City, Riverside County, California, April 10, 1936 (Calif. Acad. Sci., Ent., No. 4746, leg. C.D. Michener). - Michener, 1949Michener, C.D. 1949. Records and descriptions of american Megachilid bees (Hymenoptera). Journal of the Kansas Entomological Society 22 (2):41-59. (distribution); Michener, 1951Michener, C.D. 1951. Records of small Megachilid bees (Hymenoptera). Journal of the Kansas Entomological Society 24 (2):50-55. (distribution); Michener, 1954Michener, C.D. 1954. Records and descriptions of North American Megachilid bees. Journal of the Kansas Entomological Society 27 (2):65-78. (distribution); Hurd & Michener, 1955Hurd, P.D. Jr. & C.D. Michener 1955. The Megachilidae bees of California (Hymenoptera: Megachilidae). Bulletin of the California insect survey 3:1-247. (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); 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); Esperanza de Pedro, 2021Esperanza de Pedro, D. 2021. . :. (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).