202 



THE PROTECTION OF WOODLANDS. 



places, the eggs being laid singly on roots of ^ in. diameter upwards, 

 or sometimes in sawdust heaps near sawmills in the woods. In about 

 4 weeks they hatch out and bore in the dead cambium, but later enter 

 the sapwood and form long winding galleries, trending downwards and 

 sometimes 3 ft. long, at the end of which the pupal-chamber is formed. 

 The yellowish-white larva? have a large brown head, are curved or bent 



Fig. 44. 



Fig- 43 



The large Pine- 



weevit(l-iy\obms 



abietis). 



a. Beetle (slightly 



magnified). 



b. Larva (natural 



size). 



c. Pupa (natural 



size). 



Voting Spruce gnawed by the large Pine-weevil (Hylobius 

 abietis), natural size. 



a. Tarts gnawed. 



?>. Parts undamaged. 



by ventral contraction, and are about to in. long. When full grown, 

 in autumn they hollow out their pupal-chamber in the sapwood, seal it 

 up with bore - dust and wood - chips, and hibernate as larvae till the 

 following June, when they pupate and emerge as beetles about three 

 weeks later, the development from egg to beetle thus occupying about 

 15 months. Beetles emerging in July and only partially reproducing 

 themselves are very destructive in the following spring. They begin to 

 hibernate from about the end of August till autumn, in thick grass or 



