ILLUSTRATIONS. 



PLATES. 



Pago 

 P. ATE I. Classification of the genus Dendroctonns, showing technical and 



common names and species numbers 1 



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



droctonus 80 



III. Dendrodonus adults. Fig. 1. — D. brevicomis. Fig. 2. — D. barberi. 

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



arizonicus. Fig. 6. — D. mexicanus. Fig. 7. — D. parallelocolUs 164 



IV. Dendroctonus adults. Fig. 8. — D. approximatvs. Fig. 9. — D. vion- 



ticolse. Fig. 10. — D. ponderosx. Fig. 11.- — D. jejfreyi 164 



V. Dendroctonus adults. Fig. 12. — D. simplex. Fig. 13. — D. pseudot- 



sugse. Fig. 14. — D. piceaperda. Fig. 16. — D. borealis 164 



VI. Dendroctonus adults. Fig. 17. — D. obesvs. Fig. 18. — D. rufi- 



pennis. Fig. 20.^ — D. punctatvs. Fig. 21. — D. micans 164 



VII. Dendroctonus adult8. Fig. 22. — D. terebrans. Fig. 23.^ — D. valen^.. 164 

 VIII. Dendroctonus larvae. Fig. 1. — D. brevicomis. Fig. 19. — D. mur- 



rayanse. Fig. 23. — D. valens 164 



IX. Figs. 1-18. — Typical tarsi and til iae of the subfamilies of Scolytoidea. 170 

 X. Figs. l-5a. — Antennae of typical species of the subfamilies of Scoly- 

 toidea 170 



XI. Figs. 7-lOa. — Antennae of typical species of the subfamilies of Scoly- 

 toidea 170 



XII. Figs. 12-18b. — Antennte of typical species of the subfamilies of 



Scolytoidea 170 



XIII. Figs. l-9b. — Tibiae and tarsi of typical species of the subfamilies of 



Scolytoidea 178 



XIV. Figs. 10-lOb. — Tibiae and tarsi of typical species of the subfamilies 



of Scolytoidea 178 



XV. Figs. 12-15b. — Tibiae and tarsi of typical species of the subfamilies 



of Scolytoidea 178 



XVI. Figs. 16-18b. — Tibiae and tarsi of typical species of the subfamilies 



of Scolytoidea 178 



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 mouth parts 13 



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



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



8. Pissodes strobi: Head, ventral aspect, and mouth parts 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: Area of pronotum 23 



17. Dendroctonus valens: Area of pro+horax, ventral aspect 24 



vin 



I 



