' 



opportunity to perforate the bark surface end fly to another 

 tree. This flight often depends on weather conditions. As 

 each individual perforates his own exit, the hark plates are 

 often full of holes. The nature beetle is nearly or quite 

 black, small and cylindrical. About 8 per cent of insect - 

 killed yellow pine trees are killed by this species. 



This particular beetle nay then be identified by 

 a connection of the following facts: It kills yellow pine; 

 it makes winding galleries filled with sawdust in the cambium; 

 the larval or grub galleries do not usiially show on the inner 

 surface of the bark; the grubs or larvae are f^und in the out- 

 er or cork bark and the emergence or exit holes look like snail 

 sh^t holes in the bark plates. All freshly cut material such 

 as cull logs and large limbs breod this beetle. Infested tree;-;, 

 often show evidence of woodpecker work where the outer surface 

 of the bark has been scaled off by the birds in their search 

 for the grubs. 



DEIDROCTQiTJS MONTICOLAE. HOPK . 

 (The Mountain Pine Beetle.) 



HOvSt - Sugar pi ne , lodgepole pine, 

 mountain pine and yellow pine. 



Thio beetle is largely destructive to sugar pine, 

 killing about 95 per cent of the insect -infested trees north 



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