Bul. 32, New Series, Div. of Entomology, U. S. Dept. of Agriculture. PLATE |. 
WORK OF THE PINE-DESTROYING BEETLE OF THE BLACK HILLS (DENDROCTONUS 
PONDEROSA N. SP.). PRIMARY GALLERIES AND LARVAL MINES IN INNER SUR- 
FACE OF LIVING BARK. 
a, Entrance and basal chamber; ), ventilating holes in roof of gallery; ¢, termination. 
The larval mines radiate from the primary galleries. About one-half natural size. 
(Original. ) 
