an insect which has long been exceedingly destructive to fruit and shade trees in central Europe, and which in 1869 was introduced into America by a man who was experimenting to find a silkworm which would be free from disease. Some of his specimens accidentally escaped, and although he called the attention of the public to the fact, yet the matter was neglected until about twenty years later, when their ravages became so severe that the legislature of Massachusetts was compelled to take action to exterminate them. The male moth is described as brownish-yellow, varying to greenish-brown in color, with a slender body and an expanse of wings ranging from one to one and one-half inches. The wings are darker than the body and have prominent black markings. The flight is characterized by a peculiar zigzag motion, which assists in identifying the insect. The body of the female is light buff and covered with hairs which are used by the moth to protect the eggs when they are deposited. The wings have an expanse of nearly ten inches, and are nearly white, with small black markings. However, because of the large size of the body, the female is unable to fly. The eggs are deposited in July and August in clusters about three-fourths of an inch wide and an inch and a half long, forming a yellowish hair-covered mass. The clusters vary in size and contain from 75 to 1000 eggs. The eggs hatch about the first of May and the larvae or caterpillars feed upon the foliage of fruit and shade trees until mid-summer, when they enter the pupal state. The caterpillars are hairy, and when full grown have a sooty-colored body, containing on the back a double row of red spots. The head is yellow. Before they are half grown the caterpillars frequently suspend themselves from branches of trees and drop upon animals and carriages, by which they are taken to localities not previously infested. The sudden appearance of these caterpillars in such localities may often be accounted for in this way. The caterpillars prefer the leaves of the oak, the willow, the elm and the apple tree, but they will feed upon the foliage of all fruit and shade trees, and when other sources of food fail, will attack vines, shrubs and even garden and field crop in their vicinity. They even attack the white pine, and in some localities have caused the destruction of many of these trees. The best method found for destroying the growing caterpillars is by spraying the trees with a solution of arsenate of lead, using ten pounds of arsenate to one hundred gallons of water. The spraying is most effective when done in May and June. The egg clusters can be killed by soaking them thoroughly with a creosote mixture. This work can be done effectively between August and May. Banding the trees with strips of burlap or other coarse cloth, in such a manner that the bands fold over and form a shelter for the caterpillars, is a good means of destroying large numbers. The caterpillars crawl under the folds during the night and the bands should be examined daily. At the end of the season the bands should be burned. Infested areas should be cleared of all brush, and hollow trees and untilled lands where egg clusters are supposed to exist should be burned over.