Key to the species of Epexochus

1. Base of pronotum distinctly curved towards scutellum (Fig. 42); elytral scales very slender, lanceolate (Fig. 37); southern Tajikistan .......................................................................................................................... E. korotyaevi sp. n.

– Base of pronotum nearly straight or weakly, very evenly arched (Fig. 18); elytral scales oval or oval-elliptical, aciculate (Fig. 36)............................................................................................................................................................... 2

2. All elytral intervals flat, also at base, elytra convex, sides broadened; apical lamella of aedeagus expanded, broadly rounded (Fig. 80); western Mongolia: Kobdo Aimak ................................................................... E. mongolicus sp. n.

– Elytral intervals 3, 5, 7 and 9 moderately but distinctly raised, at least at base; apical lamella of aedeagus short, acute or nearly so .................................................................................................................................................................. 3

3. Size> 15 mm; elytra convex, odd intervals only raised at base; elytral setae stiff, of variable length, sometimes relatively long but never longer than an interval width; apical lamella of aedeagus subacute (Figs. 32–35); Kazakhstan, China (Xinjiang) .................................................................................................................... E. lehmanni (Ménétries)

– Size <15 mm; elytra flat, odd intervals slightly convex up to declivity; elytral setae long, hair-like, flexible; apical lamella of aedeagus shortly acute (Fig. 63); Uzbekistan ..................................................................... E. voriseki sp. n.