OF OLD AND NEW WORLD 213 



found north of our boundary and not extending 

 into it, we shall find a considerable assemblage 

 of species, from twenty-five to thirty in number, 

 belonging to as many as thirteen genera ; and we 

 shall at once be struck by the fact that in every 

 case these genera are represented either by the 

 same or by allied species in the Old World ; and 

 what is more, that in aU cases but one they are 

 more, often much more, bountifidly supphed with 

 distinct forms in the Old World than in the New. 

 Thus we find several species of Oeneis, two of 

 which occur in Europe, four of Erebia, and two or 

 three of Coenonympha, all considered distinct from 

 those of Europe, and confined to the western half 

 of our continent ; five species of Brenthis, of which 

 three are looked ui3on as identical with those of 

 Europe, and one of Lemonias ; one each of the 

 lycaenid genera Cupido, Agriades, and Epidemia, 

 all distinct from the European species, five or six 

 species of Eurymus, of which at least two are found 

 in Europe, one of Pontia, two of Parnassius, one 

 of which is found in Europe, the same of Pajiilio, 

 and finally one of Erynnis, which also occurs in 

 Europe. This last genus is the one to which we 

 referred as being far more developed in America 

 than in Europe ; indeed, the European species, the 



