TO 



Dr. LELAND OSSIAN HOWARD 



Chief of the Bureau of Entomology, 



THIS book is 

 DEDICATED 



to him, more than to any one else, do entomologists owe 



THE practical DEVELOPMENT OF THEIR SCIENCE, WHICH 

 touches UPON EVERY HUMAN ACTIVITY. HE STOOD AMbNG 

 THE FIRST TO EMPHASIZE THE IMPORTANCE OF SANITARY 

 ENTOMOLOGY. HE STANDS NOW THE CHIEF EXPONENT OP 

 ENTOMOLOGY THROUGHOUT THE WORLD. 



