AGKICULTUEAL ENTOMOLOGY. 



CHAPTER I. 

 IXTUODUCTIOX. 



The recent rapid growtli in the subject of Agricultural 

 Entomology makes it a difficult matter to bring together 

 a comprehensive statement that will cover all of its different 

 phases in a thorough manner. Some idea of its growth 

 may be indicated by the fact that instead of a single ento- 

 mologist employed in the United States Department of 

 Agriculture, as was the case forty years ago, there are now 

 several hundred who are devoting their entire time to the 

 investigation of entomological problems, practically all of 

 which are related to agriculture. 



A similar development of this work has taken place in 

 the State Experiment Stations, and there are also State 

 ^Entomological departments working in almost every State, 

 and in many of them two or three different organizations, 

 each with a large quota of workers. 



Economic entomology in its wider sense covers all those 

 phases of the subject which have to do with insects of 

 importance in relation to mankind. The forms which 

 have distinctly agricultural relation are so numerous and 

 represent so completely all the different groups of insects 

 that we are compelled to include a very general survey of 

 the subject. 



Some idea of the size of the grouj) of insects and of its 

 place in biological study may be secured from the statement 



(17) 



