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



Plate VI. 



Work of Destructive Pine Bark-beetle. 



a, a, a, a, Characteristic forms of primary galleries; 6, normal forms of larval mines; c, abnormal 

 forms of larval mines — all slightly reduced. (Author's illustration, Yearbook, U. S. Dept. of 

 Agriculture, 1902.) 



