Bui 32, New Series, Div. of Entomology, U. S. Dept. of Agriculture. 



PLATE I. 



WORK OF THE PINE-DESTROYING BEETLE OF THE BLACK HILLS (DENDROCTONUS 



PONDEROSA N. SPJ. PRIMARY GALLERIES AND LARVAL MlNES IN INNER SUR- 

 FACE 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. 

 (Original.) 



