Confidence: It might be this.
Notes: The photo's are as good as it gets with my camera I'm afraid. It is around 15mm long and is "fearless" - it scuttles away only 20-30mm when disturbed and then returns to the top of the handle of the plastic dustbin. At x10 mag' it is beautifully and intricately marked over the entire dorsal side.
It seems similar to C. maxillosus, but that species is unmarked on the head and pronotum.