. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 504 INVERTEBRATE MORPHOLOOT. II. Subclass Pteeyoota. 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 larvjc differ in form from the adults, and various grades of metamorphosi
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 504 INVERTEBRATE MORPHOLOOT. II. Subclass Pteeyoota. 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 larvjc 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 ^cesses termed cerci, their shape suggesting J generic name Forjicida, applied to certain members of the order. The anterior wings are y^jIXjl small and chitinous and serve as covers for the protectior of the posterior p^ir, which are larger, membranous and veined, and when at rest are folded longitudinally like a fan, and in addition twice transversely, so that they are almost completely hidden by the scalelike an- terior pair. The antennse 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 tliey approach nearer the Thysanura than any other insects, and are related rather closely to the suc- ceeding order. 3. Order Orthoptera. In this order, which includes the Locusts, Grasshoppers, {Caloptenus)y Crickets {Gryllus), 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,. Fro. 2SS.—Labia minor (after Leu- NT8).. Please note that these images are extracted from scanned page im
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