A green lacewing.
lacewing definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of various families of neuropteran insects with four delicate, gauzy wings: the larvae feed on aphids and other insect pests
lacewing definition by American Heritage Dictionary
Any of various insects of the superfamily Hemerobioidea, having four gauzy wings, threadlike antennae, and larvae that feed on insect pests such as aphids.