138 FIELD ZOOLOGY. 



The Lepidoptera are widely distributed over the 

 earth's surface, some of them being found within the 

 Arctic circle, while others have the whole tropic range. 

 According to Kellogg, Vanessa cardui, the Cosmopolitan, 

 is found in every one of the continents outside the polar 

 circles. Some of the other species of butterflies are found 

 high up on mountains, near the timber line. Even the 

 snow flowers of the Alps have their insect visitors. 



