. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 96 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. With the first Avarm weather in spring—as early as the last of March in the latitude of Lakeside, Ohio—the beetles begin cutting their way out from their hibernation cells. They do not immediate^ leave these, but remain from four days to a w^eek or more, most of them feeding for a while and then migrating to trees, wood piles, and brush heaps, or to any- thing upon which they can feed and in which make brood chambers. THE xVDULT. The beetles jfiy but little during the
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 96 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. With the first Avarm weather in spring—as early as the last of March in the latitude of Lakeside, Ohio—the beetles begin cutting their way out from their hibernation cells. They do not immediate^ leave these, but remain from four days to a w^eek or more, most of them feeding for a while and then migrating to trees, wood piles, and brush heaps, or to any- thing upon which they can feed and in which make brood chambers. THE xVDULT. The beetles jfiy but little during the morning hours, migrating from tree to tree for the most part between the hours of noon and night. During the day the beetles move about on the trees, the females seeking places in which to bur- row and the males searching for burrows alreacl}^ started in which the usually accompanying male is lacking. After nightfall flight and movement over the tree cease. The male beetles probably commence feeding as soon as they cut their way out of the pupal cell, and continue to feed more or less as long as they live. When in the brood chamber the}^ ex- crete a brown bead-like frass, the food for this sex evidently being cut loose and passed back by the female. The female commences feeding as soon as she has cut into the edge of the bark, and feeds until she is too feeble to form egg cells. The burrows of Phloeotrihus liminaris can be very easily distinguished from those of Scohjtus ruguloHius^ both from the outside and on the inside of the bark. The opening of the burrow of the former is very easily distinguished from the fact that the exudation from the burrow is held together by a fine, apparently silldike thread, which is secreted by both male and female. This holds the exudation over and partly in the mouth of the burrow. After going into the sapwood the female constructs a niche which later forms an arm. Fig. 18.—Work of the peach-tree barkbeetle {Phlacotribus limi- naris) : Ga
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