This is a blue colour morph of Carabus nemoralis. Carabus nemoralis is a species with relatively few colour variations in the core of it's West European distribution. Most individuals have brownish- coppery elytra and a blue to purple coloured pronotum (thoracic shield). In the south and espcially the subspecies 'pascuorum', often shows very nice colour variations. This blue colour morph is Carabus nemoralis ssp pascuorum natio litigiosus f.i. cyanescens.