CONTENTS. XI 
Detailed information on the species — Continued. Page. 
No. 14. The eastern spruce beetle — Continued. 
Methods of control 123 
Basis of information 125 
Bibliography 125 
No. 15. The Engelmann spruce beetle (Dendroctonus engelmanni Hopk.). . 126 
Seasonal history 126 
Overwintering stages 126 
Activity of overwintered broods 127 
Economic features 127 
Methods of control 131 
Basis of information 131 
Bibliography ! 132 
No. 16. The Alaska spruce beetle (Dendroctonus borealis Hopk.) 132 
Bibliography 132 
No. 17. The Sitka spruce beetle (Dendroctonus obesus Mann.) 132 
Seasonal history 133 
Overwintering stages 133 
Activity of overwintered broods 133 
Generation 134 
Habits 134 
Economic features 135 
Methods of control 135 
Basis of information 136 
Bibliography 136 
No. 18. The redwinged pine beetle (Dendroctonus rujipennis Kirby) 136 
Seasonal history 137 
Habits 137 
Basis of information 138 
Bibliography 138 
No. 19. The lodgepole pine beetle (Dendroctonus murrayanse Hopk.) 138 
Habits 138 
Basis of information 139 
Bibliography 139 
No. 20. The Allegheny spruce beetle (Dendroctonus punctatus Lee.) 139 
Basis of information 140 
Bibliography 141 
No. 21. The European spruce beetle (Dendroctonus 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. Severin 
(1908) 142 
Specimens 146 
Bibliography 146 
No. 22. The black turpentine beetle (Dendroctonus terebrans Oliv.) 146 
Seasonal history 147 
Northern section 147 
Overwintering stages 147 
Activity of overwintered broods 147 
Generation 148 
Southern section 148 
Habits '. 149 
