ILLUSTRATIONS. 
PLATES. 
Page. 
Platb I. Classification of the genus Dendroctonus, showing technical and com- 
mon names and species numbers 1 
II. Map of the world, showing distribution of the genus Dendroctonus. . 14 
TEXT FIGURES. 
Fig. 1. The red turpentine beetle (Dendroctonus valens): Adult, dorsal aspect. 6 
2. The red turpentine beetle: Adult, ventral aspect 8 
3. The red turpentine beetle: Adult, lateral aspect . 9 
4. The red turpentine beetle: Larva, ventral, lateral, and dorsal aspects. 11 
5. The red turpentine beetle: Pupa, dorsal, lateral, and ventral aspects. . 13 
6. The western pine beetle (Dendroctonus brevicomis): Adult, larva, pupa. 42 
7. The western pine beetle: Egg galleries 43 
8. The western pine beetle: Bark showing pupal cells, exit burrows, and 
pitch tubes : 44 
9. Work of the western pine beetle: Pitch tubes on bark of tree 45 
10. Western yellow pine killed by the western pine beetle 47 
11. The western pine beetle: Distribution map 48 
12. The southwestern pine beetle (Dendroctonus barberi): Adult 49 
13. The southwestern pine beetle: Egg galleries 50 
14. The southwestern pine beetle: Distribution map 52 
15. The roundheaded pine beetle (Dendroctonus convexifrons): Adult . 53 
16. The roundheaded pine beetle: Egg galleries and larval mines 54 
17. The roundheaded pine beetle: Distribution map 56 
18. The southern pine beetle (Dendroctonus frontalis): Adult 57 
19. The southern pine beetle: Egg galleries and larval mines 58 
20. The southern pine beetle: Termination of egg galleries 61 
21. The southern pine beetle: Beginning of egg galleries 61 
22. The southern pine beetle: Bark showing pitch tubes, etc 61 
23. The southern pine beetle: Old egg galleries in living tree 62 
24. The southern pine beetle: Egg gallery in living tree, the resulting 
wound in process of healing 62 
25. White pine timber killed by the southern pine beetle 63 
26. Table Mountain pine, Mineral County, W. Va., seven years after it 
was killed by the southern pine beetle 64 
27. A forest of Table Mountain pine, Mineral County, W. Va., seven years 
after it was killed by the southern pine beetle 65 
28. Spruce timber killed by the southern pine beetle, mountains of Tran- 
sylvania County, N. C 66 
29. The southern pine beetle: Section of pine trunk, bark removed, showing 
marks of galleries and bluing on surface of wood 67 
30. The southern pine beetle: Egg galleries and larval mines, and larval 
mines of round-headed bark-borer 68 
31. The southern pine beetle : Distribution map 70 
