1 Anterior corners of pronotum strongly projecting anteriad. Antennomere I simple. Vertex sparsely and moderately densely punctate, not impressed. Elytra strongly convex, lateral impressions on disc deep.................................................................................... 2

– Anterior corners of pronotum barely projecting anteriad. Antennomere I with a small acute tip projecting anteriad on verntral side. Vertex coarsely and densely punctate, distinctly impressed. Elytra moderately convex, lateral impressions on disc shallow............................................................................................................ C. jataiensis (Pic, 1923)

2 Base of elytra with large common red patch. Pronotum narrower, 1.3× as wide as long. Vertex strongly shiny, only with macropunctation and micropunctation........................................................................................................................... C. basalis (Weise, 1910)

– Elytra uniformly pitch black. Pronotum broader, 1.5× as wide as long. Vertex somewhat opaque due to microreticulation.......................................... C. impressa Uhmann, 1930