. Elementary entomology. Insects. GROWTH AND TRANSFORMATIONS OF INSECTS 59. when the sky becomes clouded and rain threatens. While young they feed together, each little caterpillar spinning a fine strand of silk wherever it goes, which forms a sort of trail for the others. They become full grown in six or seven weeks, during which time they have molted some four or, excep- tionally, five times, at intervals of eight or nine days, though the length of time between molts varies widely according to the food supply and weather conditions. After the fourth molt the fifth stage occupies about two we
. Elementary entomology. Insects. GROWTH AND TRANSFORMATIONS OF INSECTS 59. when the sky becomes clouded and rain threatens. While young they feed together, each little caterpillar spinning a fine strand of silk wherever it goes, which forms a sort of trail for the others. They become full grown in six or seven weeks, during which time they have molted some four or, excep- tionally, five times, at intervals of eight or nine days, though the length of time between molts varies widely according to the food supply and weather conditions. After the fourth molt the fifth stage occupies about two weeks before the FIG. 75. Tent caterpillars about half grown caterpillar transforms to the on web pupa. When full grown they (Photograph by Weed) , become extremely restless, wan- der away from the nest, and are frequently encountered on walks and roadsides, and feed on al- most any plant found. They are now about two inches in length, deep black in color, thinly covered * with yellowish hairs, with a white stripe down the mid- dle of the back. At the middle FIG. 76. Full-grown tent caterpillars on web. (Reduced) Of the side of (Photograph by Weed). 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 Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882. Boston, New York [etc. ] Ginn and Company
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