ILLUSTRATIONS. 



Page. 

 Plate I. Work of the Black Hills beetle. Fig. 1. — Primary galleries and larval 

 mines in inner bark. Fig. 2. — Marks of primary galleries on surface 



of scoring chip 12 



II. Work of the Black Hills beetle. Fig. 1. — Marks of primary galleries on 

 surface of wood when bark is removed. Fig. 2. — Freshly attacked 

 tree, showing pitch tubes; adjoining tree not attacked 14 



TEXT FIGURES. 



Fig. 1. The Black Hills beetle: adult 11 



2. Work of the Black Hills beetle: primary galleries and larval mines in inner 



surface of living bark 12 



3. Work of the Black Hills beetle, in inner bark of dead tree 13 



4. Work of the Black Hills beetle: pitch tubes on surface of bark 14 



5. The Black Hills beetle: larva 15 



6. The Black Hills beetle : pupa 15 



4 



