OF PAPILIONACEOUS INSECTS. 47 



of that description which naturalists call rudimentary. 

 This is also the case with the females of some other 

 moths. So different are these females from the males, 

 that they may be taken for animals of distinct genera. 

 Their bodies are broad and thick, in proportion to 

 those of the males, and the wings excessively small, 

 as will be seen by the following figure of the female 

 Vapourer Moth: 



On the other hand, the wings of the male are 

 extremely large, in proportion to the size of the body, 

 as exemplified in the figure beneath : 



There can be little doubt that the silken web keeps 

 the eggs in a proper temperature during winter. 

 These cocoons are besides always under the shelter of 

 some wall or in the hollow of a tree. Silk is known 

 to be an excellent non-conductor of electricity, and 

 therefore must preserve the eggs in an equable 

 temperature. The following is the appearance 



