IV PREFACE TO PART I. 



ment of Cornell University. That these collections are in a suffi- 

 ciently good condition for this purpose is due very largely to the 

 generous assistance of many Entomologists. Specific acknowledg- 

 ments will be made later. 



As the completion of the work has been delayed by other duties, 

 it has seemed best to issue this part at this time. Other chapters 

 will be published as soon as practicable. In addition to the system- 

 atic part, the scope of which can be inferred from that given here, 

 there are to be chapters on the Means of Destroying Insects or of 

 Preventing their Ravages, the Collection and Preservation of Ento- 

 mological Specimens, Entomological Supplies, a Classified List of 

 Entomological Works, a Glossary, and an Introductory Chapter. 



JOHN HENRY COMSTOCK. 



ENTOMOLOGICAL LABORATORY, CORNELL UNIVERSITY, 

 September, 1888. 



