CONTENTS. 



Page. 



Introductory 5 



Historical references 5 



Report on forest insect investigation in the Pikes Peak Forest Reserve 8 



Objects 8 



Explorations 9 



Summary of results, conclusions, and recommendations 9 



The Black Hills beetle 10 



Characters of the beetle 11 



Characters of the gallery 11 



Characters of the infested trees 13 



Life history 15 



Natural and artificial influences j» 16 



Drought and cold 16 



Lightning 16 



Storms 16 



Fire 16 



Commercial cutting 17 



Summer cutting in patches 17 



Trap trees 17 



Natural enemies 18 



Insects 18 



Birds 18 



Diseases of insects 18 



Secondary enemies of the trees, and neutral insects 18 



Methods of control 19 



Application of the method in the Black Hills 19 



Application of the method in Colorado 20 



Further recommendations relating to the control of the beetle 21 



Note 22 



Index 23 



3 



