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. sp.]. primary galleries and larval mlnes in inner sur- 

 FACE of living Bark. 



xt. 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.) 



