Carabus problematicus/violaceus
The size and violet/blue metallic colouring of, atleast, the sides of the pronotum and elytra makes these two species ostensibly quite similar. They can, however, be quite easily separated by the characteristics below.
Both are widespread and often abundant where found in woodland, rough grasslands and moorlands (Luff, 2007). Both are found throughout the year although C. problematicus is a spring breeder and C. violaceus autumn (Luff, 1998) and in my limited experince the former is more likely to be encountered earlier in the year.

Pronotum
problematicus: Hind angles raised above disc. Not or barely transverse.
violaceus: Hind angles flatter not raised above level of disc. Clearly transverse.

The difference in the hind angles is by far the easiest way of separating these two species.


C.problematicus

C.violaceus
Elytra
problematicus: With distinct longitudinal granulations, Shining. Less elongate.
violaceus: Sculpture not as distinct, sometimes almost smooth. Dull. More elongate.

C.problematicus

C.violaceus

C.problematicus

C.violaceus

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