. Bulletin. Agriculture -- New Hampshire. THE LIFE HISTORY OF THE INSECT IJ3. their larval state. They are now ready to enter upon the next stage of their exist- ence, that of the pupa, or chrysalis. This is a quiet stage, in which the insect takes no food, and is unable to move about, and it needs to protect itself from its various enemies. Conse- quently, each cater- pillar spins from cer- tain silk glands in the mouth a shroud F'G. 42.—Cocoon in Currant Leaves. of silken threads, sur- rounding itself by an oval cocoon composed of several layers of silk, the outer ones much looser than the i
. Bulletin. Agriculture -- New Hampshire. THE LIFE HISTORY OF THE INSECT IJ3. their larval state. They are now ready to enter upon the next stage of their exist- ence, that of the pupa, or chrysalis. This is a quiet stage, in which the insect takes no food, and is unable to move about, and it needs to protect itself from its various enemies. Conse- quently, each cater- pillar spins from cer- tain silk glands in the mouth a shroud F'G. 42.—Cocoon in Currant Leaves. of silken threads, sur- rounding itself by an oval cocoon composed of several layers of silk, the outer ones much looser than the inner, with the hairs of the caterpillar inter- mingled with the silk on the inside layers. When this co- coon is first spun it is white, but the caterpil- lar soon colors it yellow with an excretion from the body. The caterpillars generally prefer some sort of frame-work to Fig. on Fringe-tree. ^'^'^^ their CO-. 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 New Hampshire Agricultural Experiment Station. [Hanover, N. H. ] : New Hampshire Agricultural Experiment Station
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