Forest entomology . Hlfeafti I Fig. 101.— Shoot of Scots pine, showing theentrance-hole, and a slice removed toshow the boring of a pine beetle. (FromThe Forester, by J. Nisbet.). Fig. 102. — Showing mother and larvalgalleries in process of formation. (FromThe Forester, by J. Nisbet.) months after the exit of the beetle. The exit-holes are clean-cutopenings, surrounded by a fringe of hard resin, which has in conse-quence issued from the bottom of the excavation, as the boring hasbeen sufficiently deep to reach the vital bast. A few of the beetleshibernate in the shoots, which fall with the bur
Forest entomology . Hlfeafti I Fig. 101.— Shoot of Scots pine, showing theentrance-hole, and a slice removed toshow the boring of a pine beetle. (FromThe Forester, by J. Nisbet.). Fig. 102. — Showing mother and larvalgalleries in process of formation. (FromThe Forester, by J. Nisbet.) months after the exit of the beetle. The exit-holes are clean-cutopenings, surrounded by a fringe of hard resin, which has in conse-quence issued from the bottom of the excavation, as the boring hasbeen sufficiently deep to reach the vital bast. A few of the beetleshibernate in the shoots, which fall with the buried insect in autumn(fig. 101). In early April or the end of March they withdraw fromtheir winter-quarters and commence their breeding operations. Thefemale beetle either selects a sickly standing tree or the stem ofhealthy trees which have been felled during the previous winter, and COLEOPTERA— 109 makes a slight burrow in the bark. Having scooped out a circularchamber, she then returns to the outer world, and re-enters thechamber accompanied by the male. In this chamber copulation takesplace, after which the female proceeds to bore farther into the stem,al
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