What is a genus of bombycid moths whose caterpillars (esp. those of Orgyia leucostigma) are often very injurious to fruit trees and shade trees. The female is wingless. Called also vaporer moth called?

orgyia — A genus of bombycid moths whose caterpillars (esp. those of Orgyia leucostigma) are often very injurious to fruit trees and shade trees. The female is wingless. Called also vaporer moth. (Webster's 1913.)