DEVELOPMENT AND METAMORPHOSIS. 37 



out will come the head of a gray moth. Gradually it 

 works its wings out, then its front legs; then, by pushing 

 back on the old case with its front legs, it works out the 

 other pairs of legs and afterward its abdomen. It rests 

 frequently while it is doing all this, and now it rests a 

 longer time than it has before. Then it braces itself and 

 begins pulling its proboscis out of the jug-handle sheath. 

 This emergence may last an hour and a half or two hours. 



FIG. 19. Adult of tomato worm, showing sucking proboscis uncoiled. 



The body wall must harden to form a secure attachment 

 for the muscles which are concerned in the violent exertion 

 necessary to free the insect from its hard, dry pupal case. 

 (Fig. 19.) This moth represents the completion of the life 

 cycle; it is the parent repeated, the adult again. It 

 hangs to the old pupal case the only familiar thing in 

 a world of strangeness occasionally waving its wet, 

 wrinkled wings. Gradually the body wall hardens, the 

 wings straighten out and dry, the different colors of the 

 scales and hairs on its wings and body appear, and proba- 

 bly, by the following morning, the splendid gray-winged 

 moth will be flitting from flower to flower on the trumpet 

 creeper or in the petunia bed, not needing to be taught 

 where to look for its breakfast, having knowledge of how 



