90 



Canadian Forestry Journal June, 1915 



t ^ -i c ™ „ /!„;«„. -R,,!! PitiP at Prinrpton B C showing tunnels of the beetles which have 

 ''^'^^ kiUeV h'e' tre?-!.'' E^^Tun^nl ^of" the' ReTCpentine' Bavk-b^etle.-2. Larval-chambers of 

 the same excavalld by the young larvae working in congress.-3 Egg-tunnels of 

 the Western Pine Bark-beetle, showing egg-niches, and a few larval- 

 tunne'.s. The boring-dust has been largely removed. 



