220 LEPIDOPTERA 



The larva (Fig. 170, a) is a small greenish-white caterpillar 

 with a dark l)r()wii head, and is about 0.25 to O.)^ of an inch 

 long when full grown. Many of them become tinged with 

 red toward the hinder extremity as they approach the time 

 of pupating. 



The delicate white silken cocoons are spun in the head 

 among the dried florets, grass, and bits of eroded but un- 

 devoured flowers, so covering them with brown as to make 

 them difficult of detection. The pupte work their way 

 entirely out of their cocoons and drop to the ground before 

 bursting their pupal cases, which may be found in abundance 

 on the ground from which a brood has just issued. 



V 



Fig. 170. — Grapholilha mterstinctana: o, larva; b, pupa; c, adult; 

 all enlarged; d, adult — natural size. (After Osborn.) 



The remedies for the species are summed up as follows: 



1. Rotation of crops, not keeping clover on the same 

 ground over three years, and only two if the field becomes 

 badly infested. 



2. That the seed for a new crop be planted on land as 

 remote as possible from old clover fields. 



o. That infested fields from wdiich seed is desired the 

 following year be pastured in the fall to take up all late 

 growths and leave the field free from Acgetation, and that 



