Zethus labiatus Fabricius, 1804:284, sex not indicated.America meridionali (Mus. Dom. de Sehestedt, leg. Smidt); Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567.:280, Lectotype ♀ (UZM, Copenhagen). - As Mischocyttarus labiatus: - Smith, 1857Smith, F. 1857. Catalogue of Hymenopterous Insects in the Collection of the British Museum. Part V. Vespidae. London. 147 pp. (distribution); Buysson & Marshall, 1892du Buysson, R. & T.A. Marshall 1892. Voyage de M. E. Simon au Venezuela (Décembre 1887 - Avril 1888). Annales de la Société Entomoloqique de France 61:53-76, pls. 3-4. (distribution); Meade-Waldo, 1911Meade-Waldo, G. 1911. New species of Diploptera in the collection of the British Museum. The Annals and Magazine of Natural History ser. 8: v. 7:98-113. (distribution); Meade-Waldo & Morley, 1914Meade-Waldo, G. & C. Morley 1914. Notes and synonymy of Hymenoptera in the collection of the British Museum. The Annals and Magazine of Natural History ser. 8: v. 14:402-410. (distribution); Bodkin, 1918Bodkin, G.E. 1918. Notes on some British Guiana Hymenoptera (exclusive of the Formicidae). The Transactions of the Entomological Society of London 1917:297-321, pls. XXI-XXIII. (distribution); Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567. (distribution); Carpenter & Vecht, 1991Carpenter, J.M. & J. van der Vecht 1991. A study of the Vespidae described by William J. Fox (Insecta: Hymenoptera), with assessment of taxonomic implications. Annals of the Carnegie Museum 60 (3):211-241. (distribution); West-Eberhard et al., 1995West-Eberhard, M.J., J.M. Carpenter & P.E. Hanson 1995. The vespid wasps (Vespidae). In: Hanson, P.E. & I.D. Gauld (Ed.). The Hymenoptera of Costa Rica. 561-587. (distribution); 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); Silveira et al., 2008Silveira, O.T., S.V. da Costa Neto & O.F.M. da Silveira 2008. Social wasps of two wetland ecosystems in brazilian Amazonia (Hymenoptera, Vespidae, Polistinae). Acta Amazonica 38 (2):333-344. (distribution); Rasmussen & Asenjo, 2009Rasmussen, C. & A. Asenjo 2009. A checklist to the wasps of Peru (Hymenoptera, Aculeata). ZooKeys 15:1-78. (distribution); Valverde et al., 2019Valverde, P., P. Hanson & J. Carpenter 2019. Keys to the Costa Rican species of paper wasps (Hymenoptera: Vespidae: Polistinae). Revista de Biología Tropical (International Journal of Tropical Biology and Conservation) 67 (2):174-199. (distribution).