1	Interstriae III and V each with a single strong tooth on upper and lateral margins of elytral declivity respectively. Thailand, Brunei, East Malaysia	C.quadrispinosus sp. n.
‒	Interstriae III and V without large teeth on declivity	2
2	Pronotum parallel-sided, 1.25 times longer than wide. Pronotal disc very finely, very sparsely punctured. Length 2.2–2.6 mm. Indonesia (Java, Sumatra), Philippines	C.bicornis (Eggers)
–	Pronotum with weakly curved sides, 1.0–1.1 times longer than wide. Pronotal disc more densely and coarsely punctured. Length 2.7‒3.7 mm. China (Yunnan), India (Andaman Is., Bengal), Papua New Guinea, Philippines, Thailand, West Malaysia	C.bicornioides (Schedl),= ? C.triangularis (Schedl)