co^"TE^'TS. xr 



Detailed information on the species— Continued. . ,,„ 



Xn. 14. The eastern spruce beetle-Continued. 



Methods oi control ^23 



Basis of information ,95 



Bibliography ,,5 



No. 15. The Engelmann spruce beetle (Dendroctonus engeln}anni Hopk.). . 126 



Seasonal history ■■ or 



Overwintering stages ]^9g 



Activity of overwintered broods ]^27 



Economic features j-ri- 



Methods of control -131 



Basis of information j3l 



Bibliography j32 



No. 16. The Alaska spruce beetle (Dendroclonus boreah's Hopk.) 132 



Bibli(^raphy j32 



No. 17. The Sitka spruce beetle (Dendroctoniis obesus Mann.) 132 



Seasonal history j33 



Overwintering stages 133 



Actirity of overwintered broods 133 



Generation 134 



Habits 134 



Economic features I35 



Methods of control I35 



Basis of information 136 



Bibliography 136 



No. IS. The redwinged pine beetle {Dendroclonus rujipennis Kirb\^ 136 



Seasonal history 137 



Habits 137 



Basis of information 138 



Bibliography 138 



No. 19. The lodgepole pine beetle {Dendroclonus murrayamf Hopk.) 138 



Habits 138 



Basis of information 139 



Bibliography 139 



No. 20. The Allegheny spruce beetle (Dendroclonus punclatus Lee. ) 139 



Basis of information 140 



Biblic^iaphy 141 



No. 21. The European spruce beetle {Dendroclonus micans Kug.) 141 



Habits and seasonal history 141 



Economic features 142 



Methods of control 142 



Information from paper on the genus Dendroctonus, by Dr. G. Sexerin 



(1908) 142 



Specimens 146 



Bibliography 146 



Xo. 22. The black turpentine beetle {Dendroclonus terebrans Oliv.) 146 



Seasonal history 147 



Northern section 147 



Overwintering stages 147 



Activity of overwintered broods 147 



Gteneration 148 



Southern section 148 



Habits 149 



