27 



off to constitute the powdery material in which the eggs 

 are packed. Being incapable of flight the most she can 

 do as to wriggle down to the opening at the lower end of 

 her case where she meets the winged mate, and then 

 in the same manner wriggles back to her empty pupa 

 casein which she carefully places her eggs for safe-keep- 

 ing during the winter. Finally, with an astonishing 

 solicitude for the welfare of her prospective young, she 

 deserts the case, drops to the ground and dies shortly 

 afterward. Is it possible that this pulpy mass, exhausted, 

 with nothing more to live for, with death certain and at 

 hand, understands that a dead and putrid body left in the 

 case would work harm to her precious eggs? Anyway 

 she leaves the case. 



a 



o 



Fig. 8. The bag-worm. Showing the recently hatched worm en- 

 gaged in constructing its case. (From Division of Entomology at 

 Washington). 



The adult male of the bag-worm is a very ordinary 

 but rather fussy little moth, with black body and four 

 clear wings with some black at the front and hind mar- 

 gins. When the wings are drawn out at the side they 



