Trigona nigrocyanea Ashmead, 1900:208, ♂. Holotype ♂, St. Vincent - Leeward side; Gibbs et al., 2022Gibbs, J., A. Bass & K. Morgan 2022. Habralictus and Lasioglossum of Saint Lucia and Saint Vincent and the Grenadines, Lesser Antilles (Hymenoptera, Apoidea, Halictidae). ZooKeys 1089:125-167.:143, Holotype ♂ (NHMUK). Synonymized with Lasioglossum cyaneum (Ashmead, 1900) by Gibbs et al., 2022Gibbs, J., A. Bass & K. Morgan 2022. Habralictus and Lasioglossum of Saint Lucia and Saint Vincent and the Grenadines, Lesser Antilles (Hymenoptera, Apoidea, Halictidae). ZooKeys 1089:125-167.:143. - Ashmead, 1900Ashmead, W.H. 1900. Report upon the aculeate Hymenoptera of the islands of St. Vincent and Grenada, with additions to the parasitic Hymenoptera and a list of the described Hymenoptera of the West Indies. Transactions of the Entomological Society of London pt. II:207-367. (distribution); Friese, 1909Friese, H. 1909. Beitrag zur Bienenfauna der Kleinen Antillen und der Bermudas. Zoologische Jahrbücher Suppl. 11 (Erstes Heft):34-40. (distribution); Lutz & Cockerell, 1920Lutz, F.E. & T.D.A. Cockerell 1920. Notes on the distribution and bibliography of North American bees of the families, Apidae, Meliponidae, Bombidae, Euglossidae, and Anthophoridae. Bull. Amer. Mus. Nat. Hist 42 (15):491-641. (distribution).
Dufourea subcyanea Ashmead, 1900:215, ♂. Holotype ♂, St. Vincent; Gibbs et al., 2022Gibbs, J., A. Bass & K. Morgan 2022. Habralictus and Lasioglossum of Saint Lucia and Saint Vincent and the Grenadines, Lesser Antilles (Hymenoptera, Apoidea, Halictidae). ZooKeys 1089:125-167.:143, Holotype ♂ (NHMUK). Synonymized with Lasioglossum cyaneum (Ashmead, 1900) by Gibbs et al., 2022Gibbs, J., A. Bass & K. Morgan 2022. Habralictus and Lasioglossum of Saint Lucia and Saint Vincent and the Grenadines, Lesser Antilles (Hymenoptera, Apoidea, Halictidae). ZooKeys 1089:125-167.:143. - Ashmead, 1900Ashmead, W.H. 1900. Report upon the aculeate Hymenoptera of the islands of St. Vincent and Grenada, with additions to the parasitic Hymenoptera and a list of the described Hymenoptera of the West Indies. Transactions of the Entomological Society of London pt. II:207-367. (distribution); Friese, 1909Friese, H. 1909. Beitrag zur Bienenfauna der Kleinen Antillen und der Bermudas. Zoologische Jahrbücher Suppl. 11 (Erstes Heft):34-40. (distribution). - As Dialictus subcyaneus: - Cockerell, 1904Cockerell, T.D.A. 1904. New records of bees. The Entomologist 37:231-236. (distribution); Cockerell, 1922Cockerell, T.D.A. 1922. Descriptions and records of bees. - XCV. The Annals and Magazine of Natural History ser. 9: v. 10 (57):265-269. (distribution).
Halictus cyaneus Ashmead, 1900:219, ♂♀. 2 ♂♂, 3 ♀♀, St. Vincent; Gibbs et al., 2022Gibbs, J., A. Bass & K. Morgan 2022. Habralictus and Lasioglossum of Saint Lucia and Saint Vincent and the Grenadines, Lesser Antilles (Hymenoptera, Apoidea, Halictidae). ZooKeys 1089:125-167.:143, Syntype ♂♂ (2), ♀♀ (3) (NHMUK, USNM). - Ashmead, 1900Ashmead, W.H. 1900. Report upon the aculeate Hymenoptera of the islands of St. Vincent and Grenada, with additions to the parasitic Hymenoptera and a list of the described Hymenoptera of the West Indies. Transactions of the Entomological Society of London pt. II:207-367. (distribution); Friese, 1909Friese, H. 1909. Beitrag zur Bienenfauna der Kleinen Antillen und der Bermudas. Zoologische Jahrbücher Suppl. 11 (Erstes Heft):34-40. (distribution). - As Lasioglossum cyaneum: - Gibbs et al., 2022Gibbs, J., A. Bass & K. Morgan 2022. Habralictus and Lasioglossum of Saint Lucia and Saint Vincent and the Grenadines, Lesser Antilles (Hymenoptera, Apoidea, Halictidae). ZooKeys 1089:125-167. (distribution).