. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 26 SOME INSECTS TNJTTRIOnS TO FORESTS. OufcrBarAf tho beetles usually settle upon a few trees close toj^jether and crawl al)()ut upon the l)ark froui near the base to about two-thirds of the distance to the tree's to[), seekin<5j suital)le places for entrance. Crev- ices in the bark are favorite j^laces with them for this purpose. The female appears to bore the entrance hole in the bark, and may or may not be closely followed by her mate. In some cases where gal- leries had just been started, females were foun
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 26 SOME INSECTS TNJTTRIOnS TO FORESTS. OufcrBarAf tho beetles usually settle upon a few trees close toj^jether and crawl al)()ut upon the l)ark froui near the base to about two-thirds of the distance to the tree's to[), seekin<5j suital)le places for entrance. Crev- ices in the bark are favorite j^laces with them for this purpose. The female appears to bore the entrance hole in the bark, and may or may not be closely followed by her mate. In some cases where gal- leries had just been started, females were found alone, that is, one female to a sint!;le orallery. In others, the female was followed by the male. As the first incision is made into the livino; inner bark, the tree begins exuding pitch to cover the wound made by the intruding })eetle. This pitch or resin collects at the mouth of the entrance hole in the form usually known as a pitch tube (figs. 11 and 12, c). Where the attacking force of beetles is small, the efforts of the tree to heal these wounds not infrequent- ly succeed, the flow of pitch being so great as to overcome and suffocate the beetles. In such cases the dead beetles may be found in the pitch masses after the tree has re- covered. Where the attack- ing force is large, however, the flow of pitch does not se- riously hinder the beetles. After completing the egg lay- ing, the parent adults remain for some time in the galleries and excavate irregular branching burrows toward the end farthest from the en- trance, where they remain until they die. After successfully effecting their entrance into the bark, th^ females excavate, through the inner layer of bark, winding, irregular galleries, which run into and cross each other many times (fig. S). The eggs are laid at the sides of the gallery, each in a little niche hollowed out to receive it and packed in with the borings made in excavating the gallery. Almost immediately after hatching the larva begins feeding upon
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