Lithurgus apicalis Cresson, 1875:724, ♀. 2 ♀♀, Colorado, New Mexico (leg. Dr. H.C. Yarrow, C.E. Aiken); 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.:5, Holotype ♀ (Academy of Natural Sciences, Philadelphia). - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution); Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Cockerell, 1907Cockerell, T.D.A. 1907. The bees of Boulder County, Colorado. University of Colorado Studies 4:239-259. (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, 1926Cockerell, T.D.A. 1926. Descriptions and records of bees. - CIX. The Annals and Magazine of Natural History ser. 9: v. 17 (99):301-309. (distribution); Cockerell, 1930Cockerell, T.D.A. 1930. Bees from Mesa Verde, Colorado, in the American Museum of Natural History. American Museum Novitates 397:1-8. (distribution); Cockerell, 1934Cockerell, T.D.A. 1934. Records of Western bees. American Museum Novitates 697:1-15. (distribution); Mitchell, 1938Mitchell, T.B. 1938. The bee genus Lithurgus (Hymenoptera: Megachilidae). Psyche 45:146-155. (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); 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 apicalis: - 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 Lithurge apicalis apicalis: - 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). - As Lithurgopsis apicalis: - Esperanza de Pedro, 2021Esperanza de Pedro, D. 2021. . :. (distribution).
Lithurgopsis apicalis opuntiæ Cockerell, 1902:182, sex not indicated. 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.:5, no types designated, and none of the original material can be identified with surety. Synonymized with Lithurge apicalis (Cresson, 1875) by 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.:3. - As Lithurge apicalis opuntiae: - 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). - As Lithurgus apicalis opuntiae: - Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Cockerell, 1914Cockerell, T.D.A. 1914. Descriptions and records of bees. - LVIII. The Annals and Magazine of Natural History ser. 8: v. 13 (76):424-433. (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, 1937Cockerell, T.D.A. 1937. Bees collected by Mr. and Mrs. J. L. Sperry and Mr. R. H. Andrews in Arizona. Bulletin of the Southern California Academy of Sciences 36 (3):107-110. (distribution); Mitchell, 1938Mitchell, T.B. 1938. The bee genus Lithurgus (Hymenoptera: Megachilidae). Psyche 45:146-155. (distribution).
Lithurgus arizonensis Cockerell, 1937:108, 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.:5, Holotype ♀ (California Academy of Sciences, San Francisco). Synonymized with Lithurge apicalis (Cresson, 1875) by 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.:3.