. A manual for the study of insects. Insects. 366 THE STUDY OF INSECTS. closely resemble those of the Hesperiidae. But the Giant Skippers exhibit a very peculiar specialization of wing struc- ture in the male sex. Here the two branches of vein VII of the fore wings separate from each other and from the cross- vein connecting them with vein Vg, near the base of the wing (Fig. 446). In this sex this cross-vein, the branches of. Fig. 447.—Wings of Megathymui cofagui^ female. XI JX VII2 Fig. 446.—Wings of Megatkymus yucca^ male. vein VII, and vein IX are all very stout. The strengthening of these
. A manual for the study of insects. Insects. 366 THE STUDY OF INSECTS. closely resemble those of the Hesperiidae. But the Giant Skippers exhibit a very peculiar specialization of wing struc- ture in the male sex. Here the two branches of vein VII of the fore wings separate from each other and from the cross- vein connecting them with vein Vg, near the base of the wing (Fig. 446). In this sex this cross-vein, the branches of. Fig. 447.—Wings of Megathymui cofagui^ female. XI JX VII2 Fig. 446.—Wings of Megatkymus yucca^ male. vein VII, and vein IX are all very stout. The strengthening of these veins is evidently a specialization that increases the power of flight of this sex. For these stout veins must aid in depressing the hind wings during the downward stroke of the wings, as the hind wing is overlapped by that part of the fore wing traversed by these veins. The separation of the branches of vein VII from each other and from the cross- vein, so near the base of the wing, is directly correlated with the strengthening of these veins. In the course of the perfecting of the powers of flight in the male these. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. joint author. Ithaca, N. Y. , Comstock Pub. Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
