darkling beetle

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. A beetle of the family Tenebrionidae, having a brown or black body and feeding on decaying vegetation, living plants, or stored grain. It is found in a variety of habitats, including deserts. Also called tenebrionid.

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

• n. sluggish hard-bodied black terrestrial weevil whose larvae feed on e.g. decaying plant material or grain