. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 22 FIELD WORK AGAINST GIPSY AND BROWN-TAIL MOTHS. by silk spun by the caterpillars. As the season advances more leaves are drawn into the web, and this is lined with silk and serves during the winter as a hibernaculum for the larvae. The caterpillars do not remain in a single lar^e cell. The web is divided by cross partitions into small pockets in each of which one or more of the larvae remain during the winter. The webs (fig. 4) are very con- spicuous on the trees during the winter, as they are usually located a
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 22 FIELD WORK AGAINST GIPSY AND BROWN-TAIL MOTHS. by silk spun by the caterpillars. As the season advances more leaves are drawn into the web, and this is lined with silk and serves during the winter as a hibernaculum for the larvae. The caterpillars do not remain in a single lar^e cell. The web is divided by cross partitions into small pockets in each of which one or more of the larvae remain during the winter. The webs (fig. 4) are very con- spicuous on the trees during the winter, as they are usually located at the tips of the branches. (See fig. 5.) During the first warm days of spring the caterpillars come forth from the webs and begin feeding on the bursting buds. In cases where the trees are badly infested the tiny leaves are devoured as fast as they develop. The caterpillars feed until about the 20th of tTune before becoming full growTL. They molt four or five times in the spring, and when ready. Fig. 4.—Winter webs of the brown-tail moth {Evproctis chiy^onhcea). (Original.) to spin their cocoons are about an inch and a half in length. The body is nearly black and covered with rows of yellow spines and barbed hairs which arise in tufts on the back and sides. There is also a row of nearly white tufts on the full-grown larvae, which arise along each side of the dorsal abdominal segments. The next to the last two segments each bear a small coral-red tubercle on the dorsal part. As soon as the caterpillars are full-fed they seek shelter and spin up loose cocoons, within which they pupate. THE PUP^. The cocoons (PI. IV, fig. 1) may often be found in leaves which have been webbed together by the larvae, in crevices in the bark,. 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.
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