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



PLATE VII. 



FIG. 1. SMALL FRESHLY ATTACKED PINE TREE, SHOWING 

 PITCH TUBES. 



FIG. 2. MARKS OF PRIMARY GALLERIES ON 

 THE SURFACE OF WOOD WHEN BARK is 



REMOVED. 



FIG. 3. FRESHLY ATTACKED TREE, SHOWING PITCH TUBES. FIG. 4. DEAD TREE ; OUTER BARK REMOVED 



ADJOINING TREE NOT ATTACKED. BY WOODPECKERS. 



SCENES IN THE PINE FORESTS OF THE BLACK HILLS FOREST RESERVE. 



