Oak Skeletonizer (Bucculatrix ainsliella) - The adult moth is off-white with brown markings and a wingspan of 5/16 - inch. Larvae are yellow-green and 1/4 - inch-long when fully grown. Larvae spin white webs on the undersides of leaves, where they molt before transforming to the next instar. These webs are noticeable wherever larvae are present. Brown pupae occur inside 1/4-inch-long, white-ridged cocoons on leaves, bark, buildings, and other objects.