. A text-book of invertebrate morphology. Invertebrates. 504 INVERTEBRATE MORPHOLOGY. II. Subclass Pteeygota. The members of the subclass Pterygota are, as the name indicates, typically provided with wings, though in a compar- atively few cases these structures may have disappeared through degeneration due to parasitic habits, or through special adaptation to certain conditions of life, as in the neuters of the Ants and Termites. In nearly all cases the larvae differ in form from the adults, and various grades of metamorphosis are found. 1. Order Dermaptera. The Dermaptera or Earwigs (Fig. 233
. A text-book of invertebrate morphology. Invertebrates. 504 INVERTEBRATE MORPHOLOGY. II. Subclass Pteeygota. The members of the subclass Pterygota are, as the name indicates, typically provided with wings, though in a compar- atively few cases these structures may have disappeared through degeneration due to parasitic habits, or through special adaptation to certain conditions of life, as in the neuters of the Ants and Termites. In nearly all cases the larvae differ in form from the adults, and various grades of metamorphosis are found. 1. Order Dermaptera. The Dermaptera or Earwigs (Fig. 233) are usually small insects which resemble not a little the Thysanura. The abdomen terminates in a pair of forceplike processes termed cerci, their shape suggesting the generic name Forficula, applied to certain members of the order. The anterior wings are small and chitinous and serve as covers for the protection of the posterior pair, which are larger, membranous and veined, and when at rest are folded longitudinally like a fan, and in Fig. ZZZ.—Labia addition twice transversely, so that they are minor (after Led-. NIS). almost completely hidden by the scalelike an- terior pair. The antennae are long and filiform, and the mouth-parts adapted for biting. The Earwigs are terrestrial forms and pass through a gradual metamorphosis. In many respects they approach nearer the Thysanura than any other insects, and are related rather closely to the sue- ceeding order. 2. Order Orthoptera. In this order, which includes the Locusts, Grasshoppers, {Caloptenus), Crickets (Grylhis), Cockroaches {Periplaneta), and other forms, the mouth-parts are adapted for biting and the last segment of the abdomen bears two-jointed cerci. The anterior wings form, as in the Dermaptera, covers for the posterior pair and are chitinous plates; the posterior ones are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and a
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