Megachile spinotulata Mitchell, 1934:357, ♂♀. Holotype ♂, Los Angeles County, California (U.S.N.M., no. 39981, leg. Coquillett); Mitchell, 1937Mitchell, T.B. 1937. A revision of the genus Megachile in the Nearctic Region. Part VIII. Taxonomy of the subgenus Chelostomoides, Addenda and Index (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 63 (4):381-421.:415, Type ♀ (U.S.N.M., no. 39981); Raw, 2002Raw, A. 2002. New combinations and synonymies of leafcutter and mason bees of the Americas (Megachile, Hymenoptera, Megachilidae). Zootaxa 71:1-43.:8, Type ♂ (USNM, 39981). - Mitchell, 1934Mitchell, T.B. 1934. A revision of the genus Megachile in the Nearctic Region. Part I. Classification and descriptions of new species (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 59 (4):295-361. (distribution); Mitchell, 1937Mitchell, T.B. 1937. A revision of the genus Megachile in the Nearctic Region. Part VIII. Taxonomy of the subgenus Chelostomoides, Addenda and Index (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 63 (4):381-421. (distribution); Raw, 2002Raw, A. 2002. New combinations and synonymies of leafcutter and mason bees of the Americas (Megachile, Hymenoptera, Megachilidae). Zootaxa 71:1-43. (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). - As Chalicodoma spinotulata: - 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); Snelling, 1990Snelling, R.R. 1990. A review of the native North American bees of the genus Chalicodoma (Hymenoptera: Megachilidae). Contributions in Science, Natural History Museum Los Angeles County 421:1-39. (distribution).
Megachile subspinotulata Mitchell, 1934:360, ♀. Holotype ♀, Coyote Mountains, Arizona, about 3500 feet, August 4-7, 1916 (Am. Mus. Nat. Hist.); Mitchell, 1937Mitchell, T.B. 1937. A revision of the genus Megachile in the Nearctic Region. Part VIII. Taxonomy of the subgenus Chelostomoides, Addenda and Index (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 63 (4):381-421.:415, Type ♀ (Am. Mus. Nat. Hist.). Synonymized with Chalicodoma spinotulata (Mitchell, 1934) by Snelling, 1990Snelling, R.R. 1990. A review of the native North American bees of the genus Chalicodoma (Hymenoptera: Megachilidae). Contributions in Science, Natural History Museum Los Angeles County 421:1-39.:37. - Raw, 2002Raw, A. 2002. New combinations and synonymies of leafcutter and mason bees of the Americas (Megachile, Hymenoptera, Megachilidae). Zootaxa 71:1-43. (distribution), 8 ( listed as synonym of Megachile spinotulata Mitchell, 1934).