Diadasia cinerea Fowler - Cockerell, 1905Cockerell, T.D.A. 1905. Diadasia Patton; a genus of bees. American Naturalist 39 (466):741-745.:744 ( listed as synonym of Diadasia bituberculata (Cresson, 1878)); Cockerell, 1905Cockerell, T.D.A. 1905. The bees of southern California. - VII. Bulletin of the Southern California Academy of Sciences 4 (1):13-15. (distribution).
Melissodes bituberculata Cresson, 1878:218, ♂. 3 ♂♂, California (leg. Crotch). - As Diadasia bituberculata: - Cockerell, 1905Cockerell, T.D.A. 1905. Diadasia Patton; a genus of bees. American Naturalist 39 (466):741-745. (distribution); Michener, 1935Michener, C.D. 1935. Bees from costal northern California. The Pan Pacific Entomologist 11 (4):178-182. (distribution); Linsley & MacSwain, 1957Linsley, E.G. & J.W. MacSwain 1957. The nesting habits, flower relationships, and parasites of some North American species of Diadasia (Hymenoptera: Anthophoridae). The Wasmann Journal of Biology 15 (2):199-235. (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).