Key to the species and subspecies of Trigonocnera

1. Pronotum 1.6 times as broad as long; lateral margins of elytra arcuate; 3rd segment of antennae 3.5 times as long as

broad; prosternal process triangular apically ................................................................................................................ 2 -. Pronotum 1.3 times as broad as long; lateral margins of elytra parallel; 3rd segment of antennae 2.8 times as long as broad; prosternal process round apically; mesosternum gibbous forwardly; length 16.0–22.0 mm .............................. ....................................................................................................................................................... T. granulata sp. nov. 2. Disc of pronotum flat; prosternal process strongly curved beyond procoxae; 1st segment of metatarsi longer than 4th; length 17.0–21.0 mm ........................................................................................... T. pseudopimelia pseudopimelia

-. Disc of pronotum convex; prosternal process level beyond procoxae; 1st segment of metatarsi shorter than 4th; length 16.3–20.0 mm ............................................................................................................... T. pseudopimelia reitteri