. The butterflies of the eastern United States. For the use of classes in zoology and private students. Butterflies; Butterflies. EASTERN UNITED STATES. 29 and on each side a small, scaly piece covering the base of the fore wings, and known as the shoulder-tuft, lap- pet, or pterygoid. The second and third thoracic joints bear each a pair of wings. These are composed of mem- branes supported by a framework of slender, tapering tubes between the membranes. The fore wings are the largest, triangular in general outline, while the hind wings are more or less rounded or square. The veins or framewo
. The butterflies of the eastern United States. For the use of classes in zoology and private students. Butterflies; Butterflies. EASTERN UNITED STATES. 29 and on each side a small, scaly piece covering the base of the fore wings, and known as the shoulder-tuft, lap- pet, or pterygoid. The second and third thoracic joints bear each a pair of wings. These are composed of mem- branes supported by a framework of slender, tapering tubes between the membranes. The fore wings are the largest, triangular in general outline, while the hind wings are more or less rounded or square. The veins or framework are nominally five principal veins,—the costal, sub- costal, median, sub- median, and internal. The first two are close together near the front edge of the wing, and form the costa (see Fig. 6). The median passes through the middle from the base to near the outer third, where it usually joins the sub- costal by a cross-vein ; and from this and the cross-vein are given off several branches, the subcostal also being branched on its upper side, more in the fore wings than in the hind. The area between the subcostal and median veins is knuwn as the discal cell, or the cell, the branches 3*. Fore and hind wing of a butterfly: 1, fore wing; a, costal vein; 6, subcostal vein; 6 1, 6 2, 6 3, 6 4, 6 5, five subcostal veinlets ; c, in- dependent vein ; d, median vein ; d 1, <l 2, d 3, d 4, four median veinlets ; e, submediau vein ; /, internal vein; 6 and d are situated in tho discal cell; gl, g2, gZ, the upper, middle, and lower discal veinlets; 11, hind wing (the lettering the same).. 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 French, G. H. (George Hazen), 1841-1935. Philadelphia, J. B. Lippincott Company
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