Key to Cylindratus species

1. Metope and coryphe elongate, 1.7 times as long medially as wide between the eyes. The disc of pronotum with 5 (4+1) traces of larval sensory pits along each lateral margin (Zhang et al. 2020, fig. 28a, b). Phallobase elongate (in lateral and dorsal views), cylindrical (Zhang et al. 2020, fig. 28f, g). Style with capitulum jointed with main plate at obtuse angle (in lateral view) (Zhang et al. 2020, fig. 28d)..................................................... C. longicephalus Meng, Qin et Wang

–. Metope and coryphe slightly longer than wide, 1.1–1.2 times as long medially as wide between the eyes (Figs 2, 3, 5, 6). The disc of pronotum with 4 traces of larval sensory pits along each lateral margin (Fig. 22). Phallobase short, flattened dorsoventrally, wide (in dorsal view) (Fig. 13). Style with capitulum jointed with main plate at right angle (in lateral view) (Fig. 15)................................................................................ C. fansipan sp. nov.