Bui. 48, Div. of Entomology, U. S. Dept of Agriculture. 



Plate XV. 



Old Galleries of the Spruce Destroying Beetle. 



a, Grooves on the surface of the wood of a tree that had been dead about twelve 

 vears; b, wounds, or incomplete galleries, in bark of living tree; wound tilled 

 with pitch: c. from dead tree: <l. from living tree, in which some of the wounds 

 were healing; c, from old dead tree, the sapwood of which was decaying. 

 (From Bui. 28, n. s., Div. of Entomology, U. S. Dept. of Agriculture.) 



