Annual report of the Board of Regents of the Smithsonian Institution . ase of an insects wing, made on alarge scale, would enable us to understand more accurately the workingof the flexor mechanism, and, incidentally, it should be an excellentobject for museum display. HOW INSECTS FLY SNODGRASS 413 The flexing of the wing becomes a still more complicated process ifthe vannal region is particularly enlarged. In some of the Orthoptera,including most of the cockroaches, the grasshoppers, and the crickets,and in some other insects, the vannus of each hind wing is so muchexpanded (fig. 15 B) that,
Annual report of the Board of Regents of the Smithsonian Institution . ase of an insects wing, made on alarge scale, would enable us to understand more accurately the workingof the flexor mechanism, and, incidentally, it should be an excellentobject for museum display. HOW INSECTS FLY SNODGRASS 413 The flexing of the wing becomes a still more complicated process ifthe vannal region is particularly enlarged. In some of the Orthoptera,including most of the cockroaches, the grasshoppers, and the crickets,and in some other insects, the vannus of each hind wing is so muchexpanded (fig. 15 B) that, when the wing is flexed, it must be plaitedand folded up like a fan (fig. 23 B) in order to give space for the rest ofthe wing. In wings that are plaited during flexion there may be, asin the hiud wing of a grasshopper, two lines of folding between theremigium and the vannus with a dividing vein, or vena dividens,between them. (Fig. 15 B, Vd.) The folding and plaiting of the fullyflexed wings of a grasshopper are shown in Figure 23. The narrower vf^ iV 2V sV Vd . vf.
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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
