Bui. 83, Part I, Bureau of Entomology, U. S, Dspt. of Agriculture. 



t 



I 



A 



cu 



t 



B 



I 



C 



a 



D 



Position doubtful — 



12. simplex Lee. 12. Eastern Larch 103 



Beetle. 



13. pgeudotsugie Hopk. 1 3. Douglas Fir Beetle 106 



14. piceaperda Hopk. 14. Eastern Spruce 



Beetle. 



15. engelmanni. Hopk. 15. Engelmann Spruce 



Beetle. 



16. horealis Hopk. 16. Alaska Spruce 



Beetle. 



17. obesus Mann. 17. Sitka Spruce Beetle 



18. rufipennis Kirby. 18. Redwinged Pine 



Beetle. 



19. murrayanm Hopk. 19. Lodgepole Pine 



Beetle. 



20. punctatus I>ee. 



21. 7nira)is Kug. 



22. terebrans Oliv. 



23. valens Lee. 



20. Allegheny Spruce 

 Beetle. 



21. European Spruce 

 Beetle. 



22. Black Turpentine 

 Beetle. 



23. Red Turpentine 

 : Beetle. 



24. adjunclKn Blandf. 24. Guatemala Beetle 



114 

 126 

 132 

 132 



136 

 137 

 139 

 140 



146 

 153 



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 tekt, and will show at a glance the position 

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

 into which the genus is divided. 



