Tech. Series 17, Part I, Bureau of Entomology, U. S. Dept. of Agriculture. 



PLATE I. 



11 



02 H 



1. brevicomis Lee. 1. 



2. 6ar6m Hopk. 2. 



3. convexifrons Hopk. 3. 



4. frontalis Zlmm. 4. 



5. arizonicus Hopk. 5. 



6. mexicanus Hopk. 6. 



7. parallelocollis Chap. 7. 



8. approximatus Dietz. 8. 



Western Pine 70,81 



Beetle. 

 Southwestern Pine 70, 85 



Beetle. 

 Roundheaded Pine 70, 87 



Beetle. 



Southern Pine 70,90 



Beetle. 

 Arizona Pine 70,95 



Beetle. 



Smaller Mexican 70, 97 



Pine Beetle. 

 Larger Mexican 70,99 



Pine Beetle. 

 Colorado Pine 70,101 



Beetle. 



9. monticolse Hopk. 9. 



10. ponderosse Hopk. 10. 



11. jeffreyi Hopk. 11. Jeffrey Pine Beetle 71, 114 



Mountain Pine 71, 105 



Beetle. 

 Black Hills Beetle 71, 109 



Position doubtful 



12. simplex Lee. 12. Eastern Larch 71, 117 



Beetle. 



13. pseudotsugte Hopk. 13. Douglas Fir Beetle 71, 121 



14. piceaperdct Hopk. 14. Eastern Spruce 71,126 



Beetle. 



15. engelmanni Hopk. 15. Engelmann Spruce 71, 130 



Beetle. 



16. ftoreaftsHopk. 16. Alaska Spruce 72,133 



Beetle. 



17. obesus Mann. 17. Sitka Spruce Beetle 72,135 



18. rufipenni* Kirby. 18. Redwinged Pine 72,138 



Beetle. 



19. murrayante Hopk. 19. Lodgepole Pine 72,140 



U Beetle. 



20. Allegheny Spruce 72, 142 

 Beetle. 



21. micans Kug. 21. European Spruce 72, 143 



Beetle. 



22. terebrans Oliv. 22. Black Turpentine 72,147 



Beetle. 



23. valens Lee. 23. Red Turpentine 72, 151 



Beetle. 



24. adjunctus Blandf. 24. Guatemala Beetle 157 



Classification of the Genus Dendroctonus, Showing* Technical and Common 

 Names and Species Numbers. 



This diagram will enable the reader to refer at once to the technical and common names 

 of any species number mentioned in the text, an d will show at a glance the position 

 and relations of the divisions, subdivisions, sections, subsections, series, and species 

 into which the genus is divided. 



