In fact newly I does look at my collection and do I have a similar female in the elytral coloration, but in mine the pronotum is dark, although this can be due to that was died in alcohol !!. But it seems that this species is variable, at least that sees in the specimens of my collection. Also in the specimens of C. marginalis (that I have) these it has the protibial tooths more marked that in your picture.
Greetings
Carlos