Ohl, M. “A Colorful New Species of the Digger Wasp Genus Pseudoplisus Ashmead from the Southwestern United States (Hymenoptera: Apoidea, Crabronidae)”. Zootaxa, vol. 2009, no. 1, Feb. 2009, pp. 27–34, doi:10.11646/zootaxa.2009.1.2.