INSECTS AFFECTING FIELD CROPS 505 



jumping over it when the apparatus is pulled or pushed across 

 the field. 



Ordinarily the grasshoppers are pretty well controlled by 

 their natural enemies, among the more important of which are 

 birds, the larvae of blister-beetles, tachina-flies and bee-flies, 

 and a little red mite that attacks the nymphs and the eggs. 



