June bug

from The Century Dictionary.

• noun In the northern United States, a beetle of any one of the numerous species of the genus Lachnosterna, as L. fusca, common in the whole country.
• noun In the southern United States, a beetle very different from the preceding, Allorhina nitida, a large, smooth, greenish, species of the cetonian group of Scarabæidæ, which appears in June, and the larvæ of which resemble those of the northern June-bug in habits and appearance, being likewise known as white-grubs. See cut under Allorhina. Also Juny-bug.
• noun One of various European beetles of the genus Rhinotrogus, related to Lachno-sterna.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoö.) See june beetle.
• noun Chiefly Northern U. S. A firefly.

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.