Diagnosis. In size and proportions, this species is similar to C. chevrolati. It is easily
distinguished by having the dark apex of the elytron with a shiny, metallic purple iridescence
(black with a matte finish in C. chevrolati). Also, this apical region has areas
lacking pubescence and punctures (densely punctate and pubescent in C. chevrolati).
The metallic elytral apex sometimes has elevated costae making specimens similar to C.
thonalmus and C. contortus, however, the elytral apex is never contorted to that extreme
and lacks the costal pubescent ridges characteristic of those species.