. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE FALL WEB-WORM. 39 "Wlien tbe yonug caterpillars are forced to leave their webs tliey do not drop suddenly to tlie grouud, but suspend, themselves l3y a fine silken thread, by means of which they easily recover the tree. Grown caterpillars, which measure inches in length, do not spin such a thread. Both old and young ones drop themselves to the ground without spinning when disturbed or sorely pressed by hunger. Pupa and Cocoon.—"Favorite recesses selected for pupation are the crevices in bark an
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE FALL WEB-WORM. 39 "Wlien tbe yonug caterpillars are forced to leave their webs tliey do not drop suddenly to tlie grouud, but suspend, themselves l3y a fine silken thread, by means of which they easily recover the tree. Grown caterpillars, which measure inches in length, do not spin such a thread. Both old and young ones drop themselves to the ground without spinning when disturbed or sorely pressed by hunger. Pupa and Cocoon.—"Favorite recesses selected for pupation are the crevices in bark and similar shelters above ground ; in some cases even the empty cocoons of other moths.* The angles of tree-boxes, the rub- bish collected arouiul the base of trees and other like shelter are em- ployed for this purpose, while the second brood prefer to bury them- selves just under the surface of the ground, provided that the earth be soft enough for that purpose. The cocoon itself is thin and almost transparent, and is composed of a slight web of silk intermixed with a few hairs, or mixed with sand if made in the soil. " The pupa (Fig. 18, d and e) is of a very dark-brown color, smooth and polished, and faintly punctate; it is characterized by a swelling or bulging about the middle. It is inch long and inch broad in the middle of its body, or where it bulges a little all round. The Moth (Fig. 18, h).—" The moths vary greatly, both in size and coloration. They have, in consequence of such variation, received. 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 United States. Bureau of Entomology. Washington : G. P. O.
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