Lithurgus apicalis littoralis Cockerell, 1917:191, ♂. ♂, Point Isabel (leg. W.P. Cockerell); 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.:9, Holotype ♂ (British Museum (Natural History)). - Mitchell, 1938Mitchell, T.B. 1938. The bee genus Lithurgus (Hymenoptera: Megachilidae). Psyche 45:146-155. (distribution). - As Lithurge apicalis littoralis: - 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 Lithurge littoralis: - 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); Ruíz-Cancino & Coronado-Blanco, 2002Ruíz-Cancino, E. & J.M. Coronado-Blanco 2002. Artrópodos terrestres de los estados de Tamaulipas y Nuevo León, México. Serie Publicaciones Cientificas No. 4:1-376. (distribution). - As Lithurgus littoralis: - 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).
Lithurgus bruesi Mitchell, 1927:104, ♂. Holotype ♂, Austin, Texas (Mus. Com. Zool., No. 15710, leg. C.T. Brues); 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.:9, Holotype ♂ (Museum of Comparative Zoology). Synonymized with Lithurge littoralis (Cockerell, 1917) 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.:9. - Mitchell, 1938Mitchell, T.B. 1938. The bee genus Lithurgus (Hymenoptera: Megachilidae). Psyche 45:146-155. (distribution); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557. (distribution). - As Lithurge bruesi: - Michener, 1954Michener, C.D. 1954. A genus of bees new to the Illinois region. Journal of the Kansas Entomological Society 27 (1):. (distribution); 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).