414 



WEST VIRGINIA EXPERIMENT STATION. 



tree, the inner bark is found to be mined in all directions by 

 long^ winding or serpentine galleries which frequently cross and 

 recross each other, forming such a tangle that it is seldom possi- 

 ble to trace a single gallery from the beginning to the end. If 

 the bark is not entirely dead, the living adults are usually 

 lound in.the main galleries, and the young grubs or larvae in 

 the inner bark. 



