12 



to this more than to any other influence that the chinch bug is kept 

 within the hinits of its present abundance and destructiveness. 

 It matters Httle how great a number of these insects pass the winter 

 in safety, provided there are sufficiently prolonged, drenching rains 



Fig. 7.— Map of North America showing areas infested by chinch bug. (Author's illustration.) 



during the hatching period. Again, with an excessive abundance 

 of individuals developing from the first generation, if at the time 

 of the hatching of the young of the second generation there are 

 frequent drenching rains, an outbreak the following y(>ar is prevented. 

 Thus it is that although an outbreak may seem inevitable as the 



[Cir. 113] 



