Zethus brasiliensis Saussure, 1852:10, ♀.Le Brésil. Sainte-Catherine (Musée de Paris, leg. Dumont-D'Urville); Golfetti et al., 2020Golfetti, I.F., R.B. Lopes & F.B. Noll 2020. Taxonomic revision and cladistic analysis of the species of Zethus mexicanus group (Linnaeus, 1758) sensu Bohart & Stange, 1965 (Hymenoptera, Vespidae, Eumeninae). Zootaxa 4743 (3):337-358.:346, Holotype ♀, examined (MNHN). - Zavattari, 1912Zavattari, E. 1912. Materialien für eine Monographie der Neotropischen Eumeniden. Archiv für Naturgeschichte 78:1-272. (distribution), 17 ( listed as synonym of Zethus mexicanus (Linnaeus, 1767)); Starr & Hook, 2003Starr, C.K. & Hook, A.W. 2003. The aculeate Hymenoptera of Trinidad, West Indies. Occasional Papers o the Department of Life Sciences, University of the West Indies 12:1-31. (distribution); Halmenschlager et al., 2019Halmenschlager, M.Y., J.C. Agudelo Martínez & N.F. Pérez-Buitrago 2019. New records of Vespidae (Hymenoptera: Vespoidea) for the Colombian Orinoco Region. Biota Colombiana 20 (1):21-33. (distribution); Golfetti et al., 2020Golfetti, I.F., R.B. Lopes & F.B. Noll 2020. Taxonomic revision and cladistic analysis of the species of Zethus mexicanus group (Linnaeus, 1758) sensu Bohart & Stange, 1965 (Hymenoptera, Vespidae, Eumeninae). Zootaxa 4743 (3):337-358. (distribution). - As Zethus mexicanus brasiliensis: - Zavattari, 1912Zavattari, E. 1912. Materialien für eine Monographie der Neotropischen Eumeniden. Archiv für Naturgeschichte 78:1-272. (distribution).
Zethus brasiliensis fuscatus Bohart & Stange, 1965:130, Stange, 1997Stange, L.A. 1997. The Zethus of Venezuela (Hymenoptera: Eumenidae). Insecta Mundi 11 (3-4):311-324.:319, Holotype ♂ (ICCM); Golfetti et al., 2020Golfetti, I.F., R.B. Lopes & F.B. Noll 2020. Taxonomic revision and cladistic analysis of the species of Zethus mexicanus group (Linnaeus, 1758) sensu Bohart & Stange, 1965 (Hymenoptera, Vespidae, Eumeninae). Zootaxa 4743 (3):337-358.:346, Holotype ♂ (USA (Museum Carnegie)). Synonymized with Zethus brasiliensis Saussure, 1852 by Golfetti et al., 2020Golfetti, I.F., R.B. Lopes & F.B. Noll 2020. Taxonomic revision and cladistic analysis of the species of Zethus mexicanus group (Linnaeus, 1758) sensu Bohart & Stange, 1965 (Hymenoptera, Vespidae, Eumeninae). Zootaxa 4743 (3):337-358.:346. - Stange, 1997Stange, L.A. 1997. The Zethus of Venezuela (Hymenoptera: Eumenidae). Insecta Mundi 11 (3-4):311-324. (distribution); Rasmussen & Asenjo, 2009Rasmussen, C. & A. Asenjo 2009. A checklist to the wasps of Peru (Hymenoptera, Aculeata). ZooKeys 15:1-78. (distribution).