June beetle

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

• noun Any of various large, chiefly brownish scarab beetles of the subfamily Melolonthinae, having leaf-feeding adults that emerge in the spring and larvae that damage the roots of grasses and other plants.

from The Century Dictionary.

• noun Same as June-bug.

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

• noun any of various large usually brown North American leaf-eating beetles common in late spring; the larvae feed on roots of grasses etc.