. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 'S'fl!^ M 504 INVERTEBRATE MORPHOLOGY. II. Subclass Pterygota. The members of the subclass Pterygota are, as the name indicates, typically provided with wiugs, +! )ugh iu 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 larvte ditlor in form from the adults, and various grades of
. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 'S'fl!^ M 504 INVERTEBRATE MORPHOLOGY. II. Subclass Pterygota. The members of the subclass Pterygota are, as the name indicates, typically provided with wiugs, +! )ugh iu 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 larvte ditlor 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 l)rocesses termed cerci, their shape suggestiiii,' tlie generic name Forjiculn, applied to certaiu /f=\ I N members of the order. The anterior wings are //lilvS s'"*ill ^"^^ chitinous and serve as covers for the protection of the posterior ])air, which are larger, membranous and veined, and when at rest are folded longitudinally like a fan, and in Fig. « addition twice transversely," so that thev are minor (.after Lku- , , ^ i ^ ^ â¢â ,-,â , , n:8). almost completely hulden by the scalelike an- terior pair. The antennso are long and filiform, and the mouth-parts adapted for biting. The Earwigs are terrestrial forms and pass through a gradual metauiorphosis. Iu many respects they approach nearer the Thysanura tliau any other insects, and are related rather closely to the suc- ceeding order. 3. Order Orthoptera. In this order, which includes the Locusts, Grasshopjicrs, iCuloptenius), Crickets {Gri/UuM), CcK-kroaches {Pcriplaurt^), and other forms, the mouth-})arts are adaptcMl for biting and the last segment of the abdomen bears two-jointed cerci. The ^.^ xoiiu, an xii tun iJurniaptera, covers iur tlie posterior pair and are cliitinous jilates;
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1896
