Alcidamea grinnelli Cockerell, 1910:22, ♀. ♀, San Gabriel Mts., near Pasadena, California, 1750 feet, July 15, 1909 (leg. F. Grinnell, Jr.). - As Hoplitis grinnelli: - 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); Frohlich et al., 1988Frohlich, D.R., W.H. Clark, F.D. Parker & T.L. Griswold 1988. The xylophilous bees and wasps of a high, cold desert: Leslie Gulch, Oregon (Hymenoptera: Apoidea, Vespoidea). The Pan-Pacific Entomologist 64 (3):266-269. (distribution); Wilson et al., 2010Wilson, J.S., L.E. Wilson, L.D. Loftis & T. Griswold 2010. The montane bee fauna of north central Washington, USA, with floral associations. Western North American Naturalist 70 (2):198-207. (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). - As Hoplitis grinnelli grinnelli: - Michener, 1947Michener, C.D. 1947. A revision of the american species of Hoplitis (Hymenoptera, Megachilidae). Bulletin of the American Museum of Natural History 89:257-318. (distribution); Michener, 1954Michener, C.D. 1954. Descriptions and records of North American Hoplitis and Anthocopa (Hymenoptera, Megachilidae). The Pan-Pacific Entomologist 30 (1):37-52. (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).