THE PUPA. 



33 



There are various metliods in which, the insect liberates 

 itself from the pupa case, as graphic an example of which 

 as any, however, is the liberation of the dragon fly (Li- 

 hellula) from its case, as illustrated in the accompanying 

 engravings. 



When first liberated from the case the insect is moist 

 and pale, and its organs weak and undeveloped. Its 

 wings, in particular, are very small, and resemble little 

 bits of leather, but exposure to the air for an hour or two, 

 or even less, will entirely change its character : its wings 



