Protarcys Klapalek 1912

Key to males of species of Protarcys (male of P. lutescens Klapálek, 1912 unknown) 1. Hemitergal lobes about twice longer than wide.............................................................. 2 - Hemitergal lobes at least three times longer than wide........................................................ 4 2. Joint of the epiproct lever arm indistinct, not widened........................................................ 3 - Joint of the lever arm distinct, anterior portion swollen; epiproct tip not bifurcated (figs. 23 f–g in Zwick & Sivec 1980).................................................................................................. P. erberi 3. Hemitergal lobes tip rectangular; epiproct tip C-shaped; aedeagus unknown; Nepal, Sikkim, Xizang of China (figs. 23 d–e in Zwick & Sivec 1980)............................................................................ P. uncata - Hemitergal lobes tip rounded; epiproct tip unknown; aedeagus with arrow-shaped dorsal armature, lacks lobes; Sichuan of China (Fig. 2)................................................................................. P. caudata 4. Hemitergal lobes distinctly upcurved; epiproct tip hook-shaped in lateral view (figs. 4a, e in Zhang et al. 2024)...... P. cheni - Hemitergal lobes slightly upcurved, nearly touching each other; epiproct tip wavy in lateral view (fig. 5 in Chen 2019)............................................................................................... P. wanglanga