. Elements of zoölogy : a textbook. Zoology. FIG Coooou of Silk-worm Moth (Telea Polyphemus), wi'apped in a leaf. Coeoou of Tent. Caterpillar, Clisiocampa americana. ened, oblong, oval, or conical body, apparently lifeless ; in this form it is called & pupa or chrysalis. In a major- ity of species, however, no silken covering or cocoon is made ; but in such cases the pupa is essentially of the same form as those enclosed in a cocoon. At the end of the pupa state, which varies greatly in duration in the differ- ent species, the insect sheds its pupa skin and comes forth fully grown, a
. Elements of zoölogy : a textbook. Zoology. FIG Coooou of Silk-worm Moth (Telea Polyphemus), wi'apped in a leaf. Coeoou of Tent. Caterpillar, Clisiocampa americana. ened, oblong, oval, or conical body, apparently lifeless ; in this form it is called & pupa or chrysalis. In a major- ity of species, however, no silken covering or cocoon is made ; but in such cases the pupa is essentially of the same form as those enclosed in a cocoon. At the end of the pupa state, which varies greatly in duration in the differ- ent species, the insect sheds its pupa skin and comes forth fully grown, and in most species provided with wings; and in this state it is called a perfect insect or imago. It is held by some that the imago and pupa skins are really already formed under the skin of the larva. After insects enter upon the adult or imago state they do not increase in size. They now provide for a con- tinuation of their species, and then, in most cases, soon perish. All insects which pass through the changes described above are said to undergo a complete metamorphosis or 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 Tenney, Sanborn, 1827-1877. New York : Scribner
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