SUPERFAMILY CYNODIOIDEA 157 



No food is taken after the case is begun, neither is any excre- 

 ment to be found in the case, all having been left behind in the 

 mine. After fastening its case permanently, but before trans- 

 forming to the pupa state, the larva reverses its position in the 

 case, so that its head is towards what was formerly the posterior 

 end. 



When the time arrives for the moth to make its exit, the pupa 

 works its way out through the posterior slit in the case until it is 

 half emerged, and in that position gives forth the moth. 



The individuals of the first brood transform to pupae almost 

 immediately upon permanently fastening their cases, but the 

 members of the last brood hibernate in the larva state [see pi. 2, 

 fig. 6]. A case opened at any time during the winter will be found 

 to contain a short, thick, yellow larva differing considerably from 



the mining form In this state the insect remains until 



some time in March or April, depending upon the severity of the 

 season, when it transforms to the dusky yellow pupa. The moth 

 issues a week or so after the pupa is formed. 



