Insects of Shade Trees and Their Control. 45 
The insect and its habits—When full grown this maple worm is a 
smooth eaterpillar (fig. 26, d, e) about 2 inches long, pale yellowish 
green in color, striped lengthwise with dark green, and having a pair 
of long black horns just back of the head and a number of black pegs 
along the sides and at its hind end. These caterpillars enter the 
ground, there changing to, pup (fig. 26), 7), from which the moths 
issue in about two weeks. The moth is a woolly-bodied, pink-shaded, 
Tic, 26.—The green-striped maple worm in all its forms: a, Female moth and antenna 
of male moth; b, egg showing embryo within; c, portion of egg mass; d, full-grown 
larva from side; ec, same from back; f, pupa. Enlarged. (Howard and Chittenden.) 
pale yellow insect with a wing spread of about 2 inches (fig. 26, a). 
After mating the female lays on the underside of leaves about 150 
eggs (fig. 26, b, c), from which the caterpillars hatch in about 10 days. 
The insect overwinters in the pupa state in the ground and the first 
generation of moths issues from them in May or June, depending on 
the locality, which also determines whether two or three crops of the 
‘aterpillars are produced annually. The green-striped maple worm 
is a native of North America, and this accounts for the periodicity of 
its abundance. In the intervals between outbreaks it is kept in check 
by its natural enemies, including birds and parasitic insects. It is 
