Halictus leunculus Vachal, 1903:92, Roberts, 1972Roberts, R.B. 1972. Revision of the bee genus Agapostemon (Hymenoptera: Halictidae). The University of Kansas Science Bulletin 49 (9):437-590.:495, Lectotype ♀ (Muséum National D'Histoire Naturelle, Paris); Rasmussen, 2012Rasmussen, C. 2012. Joseph Vachal (1838–1911): French entomologist and politician. Zootaxa 3442:1-52.:33, 17♂, 16♀ (MNHN; NMW). - Rasmussen, 2012Rasmussen, C. 2012. Joseph Vachal (1838–1911): French entomologist and politician. Zootaxa 3442:1-52. (distribution). - As Agapostemon leumculus: - Ayala, 1988Ayala, R. 1988. Abejas silvestres (Hymenoptera: Apoidea) de Chamela, Jalisco, México. Folia Entomológica Mexicana 77:395-493. (distribution); Ramírez-Freire et al., 2012Ramírez-Freire, L., Alanís-Flores, G. J., Ayala-Barajas, R., Quiroz-Martínez, H. & Velazco Macías, C. G. 2012. Las abejas del género Agapostemon (Hymenoptera: Halictidae) del estado de Nuevo León, México. Revista Mexicana de Biodiversidad 83:63-72. (distribution). - As Agapostemon leumculus: - Ayala, 1988Ayala, R. 1988. Abejas silvestres (Hymenoptera: Apoidea) de Chamela, Jalisco, México. Folia Entomológica Mexicana 77:395-493. (distribution); Ramírez-Freire et al., 2012Ramírez-Freire, L., Alanís-Flores, G. J., Ayala-Barajas, R., Quiroz-Martínez, H. & Velazco Macías, C. G. 2012. Las abejas del género Agapostemon (Hymenoptera: Halictidae) del estado de Nuevo León, México. Revista Mexicana de Biodiversidad 83:63-72. (distribution). - As Agapostemon leunculus: - Roberts, 1972Roberts, R.B. 1972. Revision of the bee genus Agapostemon (Hymenoptera: Halictidae). The University of Kansas Science Bulletin 49 (9):437-590. (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); 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); Smith-Pardo, 2003Smith-Pardo, A.H. 2003. A preliminary account of the bees of Colombia (Hymenoptera: Apoidea): present knowledge and future directions. Journal of the Kansas Entomological Society 76 (2):335-341. (distribution); Sagot et al., 2018Sagot, P, J. Mérida, R. Ayala & R. Vandame 2018. Situación actual del conocimiento de la fauna de abejas (Apoidea: Anthophila) del estado de Chiapas, México. In: (Ed.). Memorias X Congreso Mesoamericano sobre Abejas Nativas. 191-2011. (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).
Agapostemon vulpicolor Crawford, 1906:162, ♀.Volcana Irazu, February, 1902 (leg. Carriker);San Jose, June 25-26th, 1903 (leg. Crawford). Synonymized with Agapostemon leunculus (Vachal, 1903) by Roberts, 1972Roberts, R.B. 1972. Revision of the bee genus Agapostemon (Hymenoptera: Halictidae). The University of Kansas Science Bulletin 49 (9):437-590.:495. - Friese, 1916Friese, H. 1916. Zur Bienenfauna von Costa Rica. Stettiner Entomologische Zeitung 77:287-348. (distribution); Cockerell, 1927Cockerell, T.D.A. 1927. Bees of the genera Agapostemon and Augochlora in the collection of the California Academy of Sciences. The Pan-Pacific Entomologist 3 (4):153-162. (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.:1954 ( listed as synonym of Agapostemon leunculus (Vachal, 1903)).
Agapostemon nasutus ater Friese, 1916:291, 310, ♀. 6 ♀♀, San José (leg. Schmidt). Synonymized with Agapostemon leunculus (Vachal, 1903) by Roberts, 1972Roberts, R.B. 1972. Revision of the bee genus Agapostemon (Hymenoptera: Halictidae). The University of Kansas Science Bulletin 49 (9):437-590.:495. - Michener, 1954Michener, C.D. 1954. Bees of Panamá. Bulletin of the American Museum of Natural History 104 (1):1-176. (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.:1954 ( listed as synonym of Agapostemon leunculus (Vachal, 1903)).