Dos Santos Junior, J.N.A., Silveira, O.T. and Carpenter, J.M. 2020.

Taxonomic revision of the Protopolybia picteti-emortualis species-group (Richards, 1978), with descriptions of two new species (Hymenoptera: Vespidae, Polistinae)

. Zootaxa. 4729, 2 (Jan. 2020), 228–248. DOI:https://doi.org/10.11646/zootaxa.4729.2.5.