DIPTERA OR TRUE FLIES. 



247 



maggot will be found in the shoot. The Frit Fly is a small, 

 black, shiny dipteron about one-eighth of an inch in length. 

 The eggs are laid by the females of the first brood upon the 

 young oats, and the maggots coming from these live in the 



^ 



Fiu. 141.— The Fkit Flv (fiscuds frit). 

 u, Adult ; 6, larva ; c, puparium (all enlarged) ; ri, young infested plant. 



heart of the young plant. The larvee are cylindrical white 

 grubs, one-eighth of an inch long when mature, and have a pair 

 of branched spiracles projecting on each side near the head, 

 and two other tuberoulate spiracles on the tail. They pupate 

 in the outer dying leaves, as small reddish-brown bodies, from 



