Entomology : with special reference to its biological and economic aspects . Wings of a May fly. Lettering as before. veins; there is no longer any excuse for the lamentable confu-sion that has hitherto attended the study of venation. Folding of Wing.—In some beetles (as Chrysobofhris) thewings are no larger than the elytra and are not folded; in Fig. 71. A typical hymenopterous wing. Lettering as before. others, however, the wings exceed the elytra in size, and whennot in use are folded under the elytra in ways that are simplebut efficient, as described by Kolbe and by Tower. To beunderstood,
Entomology : with special reference to its biological and economic aspects . Wings of a May fly. Lettering as before. veins; there is no longer any excuse for the lamentable confu-sion that has hitherto attended the study of venation. Folding of Wing.—In some beetles (as Chrysobofhris) thewings are no larger than the elytra and are not folded; in Fig. 71. A typical hymenopterous wing. Lettering as before. others, however, the wings exceed the elytra in size, and whennot in use are folded under the elytra in ways that are simplebut efficient, as described by Kolbe and by Tower. To beunderstood, the process of folding should be observed in theliving insect. As described by Tower for the Colorado potato 62 ENTOMOLOGY beetle, the folded wing (Fig. 72, B) exhibits a costal joint(a), a fold parallel to the transverse vein (b), and a complexjoint at d. The wing rotates upon the articular head (aJi)and when folded back beneath the wing-covers the innerend of the cotyla (c) is brought into contact with a chitin- FiG. 72.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
