Publisher's Synopsis
Excerpt from Some Important Insects of Illinois Shade Trees and Shrubs
The full-grown caterpillar (fig. I, e, f, h) is rather strongly marked, withga broad velvety black stripe on the back and sulphur yellow sides spotted with black, while the under side of the body is pale green. It is unusually variable in color, however, there being both light and dark forms. It is from two and a fourth to three inches long, and has a hornlike appendage projecting from the hinder end of the back. The young caterpillars (fig. I, c) are pale yellow and spotted with black. There are probably but two generations in Illinois. The caterpillars leave the trees and go into the ground to pupate (fig.
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