Lithurgus echinocacti Cockerell, 1898:453, ♀.La Cueva, Organ Mountains, N. M., Sept. 4, 1898 (leg. C.H.T. Townsend); Snelling, 1983Snelling, R.R. 1983. The North American species of the bee genus Lithurge (Hymenoptera: Megachilidae). Contributions in Science, Natural History Museum Los Angeles County 343:1-11.:6, Holotype ♀ (present location unknown). - Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Cockerell, 1915Cockerell, T.D.A. 1915. Names applied to the North American bees of the genera Lithurgus, Anthidium, and allies. Proceedings of the United States National Museum 47:87-94. (distribution); Cockerell, 1921Cockerell, T.D.A. 1921. Descriptions and records of bees. - XCI. The Annals and Magazine of Natural History ser. 9: v. 8 (45):359-368. (distribution); Mitchell, 1938Mitchell, T.B. 1938. The bee genus Lithurgus (Hymenoptera: Megachilidae). Psyche 45:146-155. (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 Lithurge echinocacti: - 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, 1983Snelling, R.R. 1983. The North American species of the bee genus Lithurge (Hymenoptera: Megachilidae). Contributions in Science, Natural History Museum Los Angeles County 343:1-11. (distribution). - As Lithurgopsis echinocacti: - Esperanza de Pedro, 2021Esperanza de Pedro, D. 2021. . :. (distribution).