CONTENTS 



Page. 



Introductory 7 



Character of the exhibit 7 



General description of the exhibit 9 



Insects injurious to fruit or seeds 13 



Insect injury to forest products 14 



Beneficial insects 14 



Method of preventing losses 14 



Catalogue of exhibit: 



Section I. — Insect enemies of forest trees in the northwestern and north- 

 eastern United States 15 



Section II. — Insect enemies of forests in general 27 



Section III. — Special investigations 43 



Section IV. — Photographs 46 



Index of scientific names 49 



Index of common names 52 



5 



