Pcecilocampa populi. December Moth, is found in this month in orchards sticking against the trunks of trees. The wings are about an inch and a quarter broad, and of a chestnut brown in colour: on the upper pair there is a pair of incurved bands, and a wavy one near the centre; the wings have also a grayish or brownish fringe. The lower pair are brown. The caterpillar is ashy gray at the sides, and rather darker on the back, and it has four red spots on each segment; at first these caterpillars are gregarious, under a silken tent, from which they issue at night to feed, but after a little time they become solitary. They feed on various kinds of fruit trees in the early part of the summer, and when full grown, they spin a silken case in which they change the pupae. The December Moth is not one of the most injurious to fruit trees, but still, in localities where it is found in tolerable abundance, the caterpillars do considerable damage to the leaves. Hand picking when the caterpillars are living in society, is the best means of diminishing them. - Gard. Chron.