THE FORKED BUTTERFLY. 181 



during the progress of the late expedition under the 

 command of Major S. H. Long, over that region. 

 In the vicinity of Fort William, an establishment of 

 the Hudson Bay Fur Company, it frequently 

 occurred in the month of September, whilst the party 

 remained at that place. It is closely allied to the 

 Polychloras and Urtica of Europe, but is sufficiently 

 distinct from either. 



The larvae of the genus Vanessa live on plants of 

 little altitude, and are often gregarious ; they are 

 armed with numerous, long, rigid, dentated spines, 

 which, like the quills of the hedgehog, constitute 

 their only defensive weapons. The chrysalids are 

 attached to a fixed object by the tail, and in this 

 reverse posture quietly wait the period of their final 

 emancipation and perfection. 



