Euglossa magrettii nigrita Friese, 1903 Kimsey & Dressler, 1986Kimsey, L.S. & R.L. Dressler 1986. Synonymic species list of Euglossini. The Pan-Pacific Entomologist 62 (3):229-236.:231, Lectotype ♀, nec Lepeletier (Washington); Nemésio & Rasmussen, 2011Nemésio, A. & C. Rasmussen 2011. Nomenclatural issues in the orchid bees (Hymenoptera: Apidae: Euglossina) and an updated catalogue. Zootaxa 3006:1-42.:22, Lectotype ♀ (AMNH). - Kimsey & Dressler, 1986Kimsey, L.S. & R.L. Dressler 1986. Synonymic species list of Euglossini. The Pan-Pacific Entomologist 62 (3):229-236.:231 ( listed as synonym of Eufriesea nigrescens (Friese, 1923)); Ramírez et al., 2002Ramírez, S., R.L. Dressler, & M. Ospina 2002. Abejas euglosinas de la Región Neotropical: Listado de especies con notas sobre su biología. Biota Colombiana 3 (1):7-118.:115 ( listed as synonym of Eufriesea nigrescens (Friese, 1923)); Nemésio & Rasmussen, 2011Nemésio, A. & C. Rasmussen 2011. Nomenclatural issues in the orchid bees (Hymenoptera: Apidae: Euglossina) and an updated catalogue. Zootaxa 3006:1-42.:22 ( listed as synonym of Eufriesea nigrescens (Friese, 1923)).
Euglossa magrettii nigrescens Friese, 1923:27, Nemésio & Rasmussen, 2011Nemésio, A. & C. Rasmussen 2011. Nomenclatural issues in the orchid bees (Hymenoptera: Apidae: Euglossina) and an updated catalogue. Zootaxa 3006:1-42.:26, Lectotype ♀ (ZMHB). - As Eufriesea nigrescens: - Bonilla-Gómez & Nates-Parra, 1992Bonilla-Gómez, M.A. & G. Nates-Parra 1992. Abejas euglosinas de Colombia (Hymenoptera: Apidae), I. Claves ilustradas. Caldasia 17 (1):149-172. (distribution); Ramírez et al., 2002Ramírez, S., R.L. Dressler, & M. Ospina 2002. Abejas euglosinas de la Región Neotropical: Listado de especies con notas sobre su biología. Biota Colombiana 3 (1):7-118. (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). - As Euglossa nigrescens: - Nemésio & Rasmussen, 2011Nemésio, A. & C. Rasmussen 2011. Nomenclatural issues in the orchid bees (Hymenoptera: Apidae: Euglossina) and an updated catalogue. Zootaxa 3006:1-42.:26 ( listed as synonym of Euglossa hemichlora Cockerell, 1917).
Euglossa longipennis Friese, 1925:28, ♀. Holotype ♀, Guayaquil, Ecuador, April 1923 (leg. v. Buchwald); Kimsey & Dressler, 1986Kimsey, L.S. & R.L. Dressler 1986. Synonymic species list of Euglossini. The Pan-Pacific Entomologist 62 (3):229-236.:231, Holotype ♀ (Berlin). - Kimsey & Dressler, 1986Kimsey, L.S. & R.L. Dressler 1986. Synonymic species list of Euglossini. The Pan-Pacific Entomologist 62 (3):229-236.:231 ( listed as synonym of Eufriesea nigrescens (Friese, 1923)); Ramírez et al., 2002Ramírez, S., R.L. Dressler, & M. Ospina 2002. Abejas euglosinas de la Región Neotropical: Listado de especies con notas sobre su biología. Biota Colombiana 3 (1):7-118.:115 ( listed as synonym of Eufriesea nigrescens (Friese, 1923)).