ILLUSTRATIONS 



PLATES. 



Page. 



PLATE I. Classification of the genus Dendroctonus, showing technical and com- 

 mon names and species numbers 1 



II. Map of world, showing geographical distribution of the genus Den- 

 droctonus 80 



III. Dendroctonus adults. Fig. 1. D. brevicomis. Fig. 2. D. barberi. 



Fig. 3. D. convexifrons. Fig. 4. D. frontalis. Fig. 5. D. ari- 



zonicus. Fig. 6. D. mexicanus. Fig. 7. D. parallelocollis 164 



IV. Dendroctonus adults. Fig. 8. D. approximates. Fig. 9. D. monti- 



colse. Fig. 10. D. ponderosx. Fig. 11. D. je/reyi 164 



V. Dendroctonus adults. Fig. 12. D. simplex. Fig. 13. D. pseudo- 



tsugse. Fig. 14. D. piceaperda. Fig. 16. D. borealis 164 



VI. Dendroctonus adults. Fig. 17. D. obesus. Fig. 18. D. rufipennis. 



Fig. 20. D. punctatus. Fig. 21. D. micans 164 



VII. Dendroctonus adults. Fig. 22. D. terebrans. Fig. 23. D. miens 164 



VIII. Dendroctonus larvae. Fig. 1. D. brevicomis. Fig. 19. D.murrayanae. 



Fig. 23. D. valens 164 



TEXT FIGURES. 



FIG. 1. Dendroctonus valens: Adult, dorsal aspect 6 



2. Dendroctonus valens: Adult, ventral aspect 8 



3. Dendroctonus valens: Adult, lateral aspect 9 



4. Dendroctonus valens: Head, dorsal and lateral aspects 12 



5. Dendroctonus valens: Head, ventral aspect, and mouthparts 13 



6. Dendroctonus valens: Head, oral aspect, epistoma, etc 14 



7. Pterostichus californicus: Head, dorsal and ventral aspects 15 



8. Pissodes strobi: Head, ventral aspect, and mouthparts 16 



9. Pissodes strobi: Head, dorsal aspect, and mandibles 17 



10. Dendroctonus: Epistomata 19 



11. Dendroctonus: Antennae 20 



12. Dendroctonus: Antennae 20 



13. Dendroctonus: Antennae 21 



14. Dendroctonus valens: Mandible 22 



1 ">. Dendroctonus: Eyes 23 



16. Dendroctonus valens: Areas of pronotum 23 



17. Dendroctonus valens: Areas of prothorax, ventral aspect 24 



18. Dendroctonus valens: Mesothorax, ventral aspect 24 



19. Dendroctonus valens: Mesotergum and mesopleurum 28 



20. Dendroctonus valens: Metatergum and metapleurum 31 



21. Dendroctonus valens: Metatergum, inner aspect 33 



22. Dendioctonus valens: Abdominal tergites 35 



23. Dendioctonus valens: Male, abdominal tergites 7 and 8 36 



24. Dendroctonus valens: Female, abdominal tergites 7 and 8 37 



XI 



