Up to 30mm. This species has ridges and dimples on its elytra and also has a pronotum that is barely transverse and with contracted sides.

C. violaceus has smoother elytra that are more elongate and also has a more transverse pronotum.

Although predominantly a woodland and heathland species, it can occasionally be found in gardens and is a useful natural pest controller.

Mainly seen in summer months

They are nocturnal hunters, hiding under logs and stones during the day.

Although widespread throughout Britain, C. problematicus is a local species and is uncommon in many areas.

Now local and uncommon in Leicestershire and Rutland and largely restricted to Charnwood.