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Fig. 6 Inner face of bark from a dying Bull Pine at Princeton, B.C., showing tunnels of 



the beetles which have killed the tree. 1. Egg-tunnels of The Red Turpentine 



Bark-beetle. 2. Larval-chambers of the same, excavated by the young 



larvae working in congress. 3. Egg-tunnels of The Western Pine 



Bark-beetle, showing egg-niches, and a few larval-tunnels. 



The boring-dust has been largely removed. (Original). 



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