Key to Taiwanese species of the genus Propristocera based on the male

1 Frons with intervals among foveae imbricate............................................................... 2

- Frons with intervals among foveae smooth and shining....................................................... 3

2 Lateral surface of metapectal-propodeal complex weakly imbricate; median portion of propodeal declivity smooth and shining; LP/WP = 1.27–1.30; apical lobe of aedeagus forming one large hooked apicolateral extension. P. formosimonticola Terayama

- Lateral surface of metapectal-propodeal complex irregularly rugose; median portion of propodeal declivity weakly transversely rugoso-scabrous; LP/WP = 0.95–1.08; apical lobe of aedeagus forming one small hooked apicolateral extension........................................................................................... P. okinawensis Terayama

3 LP/WP = 1.23–1.30; metapostnotal median carina incomplete posteriorly; apical part of hypopygium bilobate, with two large and triangular lobes; apical lobe of aedeagus forming extremely-large hooked apicolateral extension reaching ventral valve of aedeagus............................................................................... P. seediq sp. nov.

- LP/WP = 0.98–1.10; metapostnotal median carina complete; apical part of hypopygium trilobate, with two large lateral and one small median lobes; apical lobe of aedeagus forming largely hooked apicolateral extension not reaching ventral valve of aedeagus........................................................................ P. pingtungensis Terayama