136 Bugs, Butterflies, and Beetles 



the moth cracks the mummy case and works its way 

 out through the wet and softened end of the cocoon, 

 dries its crumpled wings and assumes the form of 

 Fig. 132 or 133. 



ARMY " WORMS " 



Every once in a while some section of the coun- 

 try is invaded by an army of caterpillars known 

 as ARMY " WORMS," but wlicu people call a cater- 

 pillar a worm they are talking loosely. We have 

 said something about this before, but we refer to 

 it again because we want the boys to know the 

 difference between a caterpillar and a worm. The 

 worm family is such a big one and has so many 

 distant relatives included in it, that I find it almost 

 impossible to give you a definition. One scientist 

 says, " As a rule, worms are bilateral, segmented 

 animals with the nervous cords either separated 

 or united by commissures, and resting on the floor 

 of the body," and so on. But I do not believe this 

 will help you much to imderstand it. If, however, 

 you will catch an earthworm and compare it to a 

 caterpillar, you will inmiediately see differences 

 which are more easily detected than the meaning 

 of the words just given. 



The trouble is, bo3^s, that the English language 



