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



Plate I 



Fig. 1.— The Pine-destroying Beetle of the Black Hills. 



a, Adult beetle, enlarged; b, adult beetle, natural size; c, larva; d, pupa. 



Fig. 2.— Destructive Pine Bark-beetle. 



a, Adult beetle, enlarged; b, adult, natural size; c, pupa, enlarged; d, larva, enlarged; e, young 

 larva, enlarged; /, egg, enlarged; g, larva, natural size. (After author, in Bulletin No. 56, 

 West Virginia experiment station.) 



Fig. 3.— Spruce-destroying Beetle. 



a, Dorsal view of adult beetle; 6, side view of larva; c, dorsal view of pupa— all greatly enlarged; 



d, natural size of beetle. 

 (From Yearbook, U. S. Dept. Agriculture, 1902.) 



