Five species in the delphacid planthopper genus Pentagramama have been described from the United States: P. bivittata Crawford, P. douglasensis Penner, P. longistylata Penner, P. variegata Penner, and P. vittatifrons (Uhler). Based on detailed examination of the male genitalia we synonymize P. variegata with P. douglasensis. Three of the species appear to be monophagous on bulrushes (Schoenoplectus spp.  =  Scirpus spp.; Cyperaceae). Penner (1947) provided descriptions of the species, illustrations of the heads, and a key for identification based on non-genitalic characters. We provide detailed descriptions and illustrations of the male and female genitalia, which are critical for accurate species identification.