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



Plate III. 



Work of the Pine-destroying Beetle of the Black Hills. Primary Galleries 

 and Larval Mines in Inner Surface of Living Bark. 



a, Entrance and basal chamber; b. ventilating holes in roof of gallery; c, termination. 

 The larval mines radiate from the primary galleries. About one-half natural size. 

 (Author's illustration, Bui. 32, n. s., Div. of Entomology, U. S. Dept. of Agriculture.) 



