Protopolybia scutellaris Bequaert, 1944:111, Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567.:141, Holotype ♀ (Dept. Entomology, Cornell Univ.); Santos et al., 2015Santos, J.N. dos Jr., O.T. Silveira & J.M. Carpenter 2015. Phylogeny of Protopolybia Ducke, 1905 and taxonomic revision of the Protopolybia exigua species-group (Hymenoptera, Vespidae, Polistinae) with description of four new species. Zootaxa 3956 (2):151-182.:166, Holotype ♀ (CUIC). - Richards, 1978Richards, O.W. 1978. The social wasps of the Americas excluding the Vespinae. British Museum (Natural History), London. 1-567. (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); Santos et al., 2015Santos, J.N. dos Jr., O.T. Silveira & J.M. Carpenter 2015. Phylogeny of Protopolybia Ducke, 1905 and taxonomic revision of the Protopolybia exigua species-group (Hymenoptera, Vespidae, Polistinae) with description of four new species. Zootaxa 3956 (2):151-182. (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).