Ground Beetle

Ground Beetle

Observation - Ground Beetle. Description: Can anyone with beetle knowledge help with this one: large numbers were found under logs etc on a city farm. I originally thought it was Pterostichus madidus, but now I'm not so sure as there are many similar ones.

Can anyone with beetle knowledge help with this one: large numbers were found under logs etc on a city farm. I originally thought it was Pterostichus madidus, but now I'm not so sure as there are many similar ones.