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 op their science, which 

 touches upon every human activity. he stood among 

 the first to emphasize the importance of sanitary 

 entomology. he stands now the chief exponent of 

 entomology throughout the world. 



