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. hrevicomis. Fig. 2. — D. barberi. 



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



zonicus. Fig. 6. — D. mexicanus. Fig. 7. — D. parallelocollvs 164 



IV. D&ndroctonus adults. Fig. 8. — D. approximatus . Fig. 9. — D. monti- 



colse. Fig. 10. — D. ponderosie. Fig. 11. — D. jeffreyi 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 



YIl. Dendroctonus adults. Fig. 22. — D. terebrans. Fig. 23. — D.valens.... 164 

 VIII. Dendroctonus\a.rYse. Fig. 1. — D. hrevicomis. Fig. 19. — D.Tnurrayanx. 



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 calif ornicus: 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 



15. 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. Dendi octonus valens: Abdominal -tergites 35 



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



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



SI 



