GEOGRAPHICAL DISTRIBUTION. 267 



In the Angle- wings there are eight genera, of 

 which four are represented on each continent, the 

 others being equally divided between the two 

 countries. We have in this instance a closer re- 

 semblance than in any other group of butterflies, 

 because its genera are mainly genera of the north 

 temperate zone ; and a careful study of all other 

 points of resemblance between the two countries 



FIG. 191. Epargyrens Tityrns, nat. size ; under surface on left. 



will show that they are almost all confined to 

 groups which are boreal in their aspect ; while, 

 if we had excluded from the comparisons the 

 species inhabiting in either country the high 

 north, and had included those of the extreme 

 south, not only would the number of species in 

 either country have been considerably augmented, 

 but the resemblances would have been greatly 



