Calathus is a genus of ground beetle native to the Palearctic (including Europe), the Near East and North Africa. ... Found on http://en.wikipedia.org/wiki/Calathus
Calathus is a genus of beetles of the ground beetle family, Carabidae. Some seven species are found in Britain all with a similar elongate oval form. They hide by day under leaves, moss, stones or between grass roots and come out at night to hunt. Found on http://www.probertencyclopaedia.com/browse/BC.HTM