. How to know the butterflies; a manual of the butterflies of the eastern United States. Butterflies. GENERAL ACCOUNT OF BUTTERFLIES the angle between the outer margin and the inner margin (Fig. 4, c) is the anal angle. The wings are large membranous appendages, which are thickened along certain lines. These thickened lines are termed the veins of the wing; and their arrangement is de- scribed as the venation of the wings. A study of the wings of all orders of winged insects has shown that there is a striking uniformity in the more general features of the venation of the wings of the more gene
. How to know the butterflies; a manual of the butterflies of the eastern United States. Butterflies. GENERAL ACCOUNT OF BUTTERFLIES the angle between the outer margin and the inner margin (Fig. 4, c) is the anal angle. The wings are large membranous appendages, which are thickened along certain lines. These thickened lines are termed the veins of the wing; and their arrangement is de- scribed as the venation of the wings. A study of the wings of all orders of winged insects has shown that there is a striking uniformity in the more general features of the venation of the wings of the more generalized or "lower" members of the different orders; while in the more specialized or "higher" members of each order this generalized type of venation is more or less modified. An investigation of the various ways in which this generalized type of wing venation has been modified and of the varying degrees of these modifications has contributed much to our knowl- edge of the relationships of the different groups of Fig. 4.—Margins and an- gles of a 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. New York, D. Appleton
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbutterf, bookyear1904
