Polybia melanaria Cameron, 1906:153, ♀. ♀, Belize (Prof. C.F. Baker, leg. J.D. Johnson); Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567.:280, Holotype ♀, examined (BMNH). Synonymized with Mischocyttarus labiatus (Fabricius, 1804) by Ducke, 1908Ducke, A. 1908. Beiträge zur Hymenopterenkunde Amerikas. Zeitschrift für Systematische Hymenopterologie und Dipterologie 8:695-700.:698. Synonymized with Mischocyttarus labiatus (Fabricius, 1804) by 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.:100. - Ducke, 1908Ducke, A. 1908. Beiträge zur Hymenopterenkunde Amerikas. Zeitschrift für Systematische Hymenopterologie und Dipterologie 8:695-700. (distribution). - As Mischocyttarus melanarius: - Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567. (distribution); Starr, 1987Starr, C.K. 1987. Claves para la identificacion de las avispas sociales del Parque Nacional Santa Rosa, Guanacaste, Costa Rica. Sphecos 15:13-20. (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); Maes, 1999 1999. Catalogo de los insectos y artropodos terrestres de Nicaragua. Volumen III. León, Nicaragua. 1170-1898. (distribution); Kumar et al., 2009Kumar, J.T. Longino, R.K. Colwell & S. O'Donnell 2009. Elevational patterns of diversity and abundance of eusocial paper wasps (Vespidae) in Costa Rica. Biotropica 41 (3):338-346. (distribution); Carpenter et al., 2012Carpenter, J.M., B.R. Garcete-Barrett & Y.J.A.F. López 2012. Las Vespidae (Hymenoptera: Vespoidea) de Guatemala. In: Cano, E.B. & J.C. Schuster (Ed.). Biodiversidad de Guatemala. Volumen 2. 269-279. (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).
Megacanthopus longipetiolatus Cameron, 1912:218, ♀. ♀, Costa Rica (Georgetown Museum); Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567.:280, Holotype ♂, examined (BMNH). - Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567.:280 ( listed as synonym of Mischocyttarus melanarius (Cameron, 1906)); Maes, 1999 1999. Catalogo de los insectos y artropodos terrestres de Nicaragua. Volumen III. León, Nicaragua. 1170-1898.:1757 ( listed as synonym of Mischocyttarus melanarius (Cameron, 1906)). - As Mischocyttarus longipetiolatus: - 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).
Mischocyttarus angustesulcatus Zikán, 1949:44, Lectotype ♂, examined (Inst. O. Cruz), designated by Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567.:280. - Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567.:280 ( listed as synonym of Mischocyttarus melanarius (Cameron, 1906)); Maes, 1999 1999. Catalogo de los insectos y artropodos terrestres de Nicaragua. Volumen III. León, Nicaragua. 1170-1898.:1757 ( listed as synonym of Mischocyttarus melanarius (Cameron, 1906)).