Megachile lobatifrons Cockerell, 1924:547, ♂♀. Holotype ♀, Puerto Refugio, Angel de la Guarda Island, Gulf of California, June 29, 1921 (Mus. Calif. Acad. Sci., No. 1512, leg. Van Duzee); 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.:407, Type ♀ (Mus. Calif. Ac. Sc., no. 1512). - 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); 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 lobatifrons: - 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).