ii8 PROTECTION OF WOODS AGAINST 



3. Pieces of bark twelve inches square may be placed on 

 the ground bast downwards, with stones to keep them in 

 place ; about fifty per acre are required. Children can visit 

 these bark traps daily and collect the beetles found under 

 them ; the bark should be renewed when it loses its resinous 

 smell. 



Pine-Beetle (Myelophilus piniperda). 



This is one of the commonest of our destructive beetles. 

 It is about \ inch long, and dark brown or black in colour. 



Fig. 3. Myelophilus piniper da, L. 

 a Imago. b Larva. c Pupa. 



Eggs are laid in spring in felled stems and dead or dying 

 trees of Scotch and other pines, large trees being preferred. 

 The grubs hatch in April or May, and the beetles appear 

 in June or July. The insect does two kinds of damage. 

 The grubs eat out galleries in the bast ; while the beetle itself 

 does even more harm by boring into the pith of young pine 

 shoots a few inches from their end, eating out a gallery an 

 inch long. These shoots fall off when the next heavy wind 

 comes, and thus the tree loses a great deal of its foliage. The 

 broken twigs may often be found in thousands lying on the 

 ground. 



