P. gamblesi sp. n. (<5 holotype: Obudu Plateau, Nigeria) is described, illustrated, and compared with the only other known sp. of the genus, P. stahli Foerster. The principal differences between the 2 spp. are in the form of the anal appendages which are much more elongate and slender in the former sp. There are also important venational differences between the 2 spp.