ground beetle

from The Century Dictionary.

• noun A predatory beetle of the family Carabidœ: so called from its mode of life, most of the species being found running over the ground or hidden during the day under stones and other objects.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun predacious shining black or metallic terrestrial beetle that destroys many injurious insects