. A manual for the study of insects. Insects. 202 THE STUDY OF INSECTS, what has taken place with the butterflies, the skippers, and certain moths. With these insects the humeral angle of the hind wing has been greatly enlarged, so that it projects far beneath the fore wing (Fig. 241). When this has taken place there is no longer any need of a frenulum, and consequently this organ is no longer preserved by natural selection. We find, therefore, that several families of Lepi- doptera that belong to the suborder Frenatae, being descendants of. VIIT Fig. 242.—Wings of Botnbyx mori. ancient frenul
. A manual for the study of insects. Insects. 202 THE STUDY OF INSECTS, what has taken place with the butterflies, the skippers, and certain moths. With these insects the humeral angle of the hind wing has been greatly enlarged, so that it projects far beneath the fore wing (Fig. 241). When this has taken place there is no longer any need of a frenulum, and consequently this organ is no longer preserved by natural selection. We find, therefore, that several families of Lepi- doptera that belong to the suborder Frenatae, being descendants of. VIIT Fig. 242.—Wings of Botnbyx mori. ancient frenulum-bearing moths, no longer possess a frenulum. These are classed in the following synopsis as the frenulum-losers. It is a very interesting fact, and one that bears out the theory just stated, that in the more generalized of the frenulum-losing moths, as the Bombycidae, the frenulum has not yet entirely dis- appeared, but is preserved in a rudimentary state (Fig. 242). We place the frenulum-losers last in a serial arrangement of the fami*. 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: 1325px × 1885px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
