86 THE WHITE MOUNTAINS 



peridae, show how varied and striking the fauna 

 is. Besides these a great many of the valley 

 forms often accompany them, among which will 

 be found our old friends antiopa, cardui and ata- 

 lanta, so rarely seen with us above the forest. In 

 the Cordilleras of Colorado, where the snow-fields 

 are far less important, and glaciers are practically 

 unknown, we have a condition of things between 

 the mountains of Switzerland and New Hamp- 

 shire. The number of distinct forms is consider- 

 able, but by no means so large as in Switzerland. 

 A couple of species of Oeneis are found here, with 

 several Erebias, and a Brenthis or two; some 

 Melitaeini also occur, most of which are also 

 found some distance below the timber-line, which 

 is here vastly higher than at the White Moun- 

 tains, being at about 10,000 feet. The Lycaenini 

 are abundant, and one finds a characteristic Eury- 

 mus, Parnassius (also foimd at lower levels), and 

 one or two Hesperidae of the same group as 

 occurs on the Swiss Alps. Indeed, the agreement 

 of the typical alpine forms of Colorado and 

 Switzerland is striking, and in strange contrast 

 to the poverty of New Hampshire ; the more so, 

 as a large number of the additional generic types 

 are not those characteristic of high latitudes. 



