The new sp. (holotype 6, allotype 5; Ciudad Valles, State of San Luis Potosi, 27- VI-1990; deposited in UNAM, Mexico) is described and illustrated. It is unique in the genus by possessing a thick comblike set of black, stout, sharp setae on the apex of each paraproct. The nearest relative appears to be P. mexicanus Belle, from which both sexes can be further distinguished by the interrupted 1st lateral thoracic stripe and yellow cereal tips; also, 6 with venter of cerci yellow on apical half and inferior appendages with low supero-extemal tooth and no sharp teeth on bifid apex; 5 Ushaped notch of vulvar lamina as wide as lateral arm.