462 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE LXVI 



THE HICKORY BARK BEETLE 



( Scolytus quadrispinosus ) 



Fig. 1. Different stages and galleries in the wood made by the beetle and 

 its larvae. 



After Riley. 



Fig. 2. A hickory tree, Akron, Ohio, killed by the hickory bark borer. 



