Included species: P. alaskensis (Holmes, 1904); P. crassicornis Just, 1980; P. kervillei Chevreux, 1901.
Antennae subequal. Mandible without palp, molar protruding, small. Maxilla 1 palp with one article. Gn 1 simple to subchelate, merus lengthened, partially to totally covering carpus posteriorly. Gn 2 subchelate to parachelate. P 5 basis rectilinear, P 6–7 basis widened and rounded.