carpenter bee

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various solitary bees of the genus Xylocopa that bore tunnels into wood to lay their eggs.

from The Century Dictionary.

• noun The common name of the different species of hymenopterous insects of the genus Xylocopa.

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

• noun large solitary bee that lays eggs in tunnels bored into wood or plant stems