. A manual for the study of insects. Insects. 290 THE STUDY OF INSECTS. three-branched with them, whereas it appears four-branched in the Drepanidae (Fig. 346). Although the humeral angle of the hind wings is greatly- developed in these moths, some of them retain the Fig. 346.—Wings of Or eta rosea. Fig. 347.—Wings of Platypteryx arcuata When the frenulum is present it is borne at the end of a long thickened portion of the wing, so that it is at a con- siderable distance from the point where the wing is attached to the body (Fig. 347).^ The larvae are remarkable in having the anal p
. A manual for the study of insects. Insects. 290 THE STUDY OF INSECTS. three-branched with them, whereas it appears four-branched in the Drepanidae (Fig. 346). Although the humeral angle of the hind wings is greatly- developed in these moths, some of them retain the Fig. 346.—Wings of Or eta rosea. Fig. 347.—Wings of Platypteryx arcuata When the frenulum is present it is borne at the end of a long thickened portion of the wing, so that it is at a con- siderable distance from the point where the wing is attached to the body (Fig. 347).^ The larvae are remarkable in having the anal prolegs rudimentary, and the caudal segment prolonged into a more * We class the Drepanidae among the Frenulum-conservers, although many of them have lost the frenulum. Among the true Frenulum-losers the loss of the frenulum occurs while the race is still in a very generalized con- dition, no trace of a frenulum being found among these insects except a rudi- ment in the most generalized forms {Bombyx, Cicinnus). In the Drepanidae, however, the frenulum is retained by very highly specialized forms. There is a striking similarity in this respect between this family and the more specialized 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.
Size: 1813px × 1378px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
