Spruce destroying beetle, Dendroctonus piceaperda Hopk. 

 Internal aspect of badly mined spruce bark. This view shows the lon- 

 gitudinal adult gallery and the numerous irregular dilating ones made 

 by the larvae. 



Interior view of bark showing several longitudinal adult galleries pre- 

 served by infiltrated pitch, and also two ventilating burrows, the latter 

 showing light, owing to the white background 



Blue pine borer, Callidium a n t e n n a t u m Newm. 



Hard pine branch showing characteristic mines 



782 



