THE BLACKHEAD FIREWOKM OF CRANBERRY. 



15 



the vines in which, as ah^eady mentioned, most of the individuals 

 of all generations pupate. (See fig. 8.) 



The pupae wriggle considerabl}' when first picked up, moving the 

 end of the abdomen in a circular motion, but they have no power of 

 locomotion such as the larvse have. Just before the moth is ready to 

 emerge, and in order that it may do so without hindrance, the pupa. 



Fig. 



-The blackhead flreworm : Pupa in cocoon spun in a tip of a cranberry upright. 

 Enlarged 6 times. 



by means of this wriggling motion and with the aid of a number of 

 small backwardly directed spines arranged in double rows around the 

 back of each segment of the abdomen, forces itself out through the 

 end of its loosely spun cocoon until the thorax and the tips of the wing 

 pads are free of the edge of the cocoon. (See last specimen at right 

 in lower row of fig. 6.) 



