226 IVnSC. iPUBLTCATION 273, U. S. DEPT. OF AGRICULTURE 



spruce beetle, become exceedingly destructive at times. Young trees 

 are sometimes killed by species of Lps, PseudohyJesinus, and Dry- 

 ocoete^, and by other small enoTaver beetles. 



1 



Figure 63. — Galleries of the western balsam bark beetle, Dri/ocoetcs confusus. 



The Englemann spruce beetle {Dendroctonus englemanni Hopk.) 

 has caused widespread destruction of mature Englemann spruce in 

 the Rocky Mountain region and is considered a very important 



