THE BLACKHEAD FIREWORM OF CRANBERRY. 
15 
the vines in which, as already mentioned, most of the individuals 
of all generations pupate. (See fig. 8.) 
The pupae wriggle considerably when first picked up, moving the 
end of the abdomen in a circular motion, but they have no power of 
locomotion such as the larvae have. Just before the moth is ready to 
emerge, and in order that it may do so without hindrance, the pupa, 
Fig. 
-The blackhead fireworm : 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.) 
