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



Plate XIX. 



Galleries of the Spruce Bark-beetle, Showing Different Stages. 



a, b, c. Freshly excavated galleries in living bark: d, old galleries in dead bark. ( From Bui. 28, 

 n. s., Div. of Entomology, U. S. Dept. of Agriculture.) 



