Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] THE CLASSIFICATION OF INSECTS 163 except in size and the absence of wings, have the same feeding habits and the same haunts as the adults. The name of the order is derived from the straight-margined parchment-like fore wings (orthos, straight, and ptera, wings) which are chiefly used as covers to protect the large membranous hind wings on which the flight function depends. There are numerous wing- less species in the order, and some with degenerate short wings
Elementary textbook of economic zoology Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] THE CLASSIFICATION OF INSECTS 163 except in size and the absence of wings, have the same feeding habits and the same haunts as the adults. The name of the order is derived from the straight-margined parchment-like fore wings (orthos, straight, and ptera, wings) which are chiefly used as covers to protect the large membranous hind wings on which the flight function depends. There are numerous wing- less species in the order, and some with degenerate short wings incapable of flight. The 'music' which is made by the male crickets, katydids and meadow-grasshoppers, is produced by the rubbing to- gether of the bases of the fore wings in which certain veins are thickened and roughened so as to make effective stridulat- 1- * .-•?*'''' . * FIG. 76.—The American locust, Schistocerca americana. (Natural size.) ing organs. Grasshoppers make sounds when at rest by rasping the inner surface of the broad hind legs across the outer surface of the folded fore wings, and while in flight many of them make a loud clacking sound by striking the front margin of the hind wings back and forth past the hinder margin of the thickened fore wings. Despite the beneficial feeding habits of the insect-preying mantises, the Orthoptera as a whole must be looked on as a seriously injurious group of insects. Cockroaches are great pests in houses, while crickets and especially grasshoppers work much injury to field crops. The notorious Rocky Moun-
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