552 



Mr. H. J. Elwes on a 



A. montinus is certainly a form of chariclea, which has 

 remained isolated on the White Mountains for so long 

 that it has assumed a distinctive character, and may be 

 considered as a good instance of a fixed local race. The 

 Eocky Mountain form of chariclea, which exists under 

 very similar conditions, seems the nearest to it, but I have 

 seen none which could possibly be mistaken for montinus. 



A. helena is probably another representative which 

 extends far south on the higher parts of the Eocky 

 Mountains. In Montana I took it at 6500 ft. In 

 Colorado it ascends to 13,500 ft. It is not unlike selenis, 

 but may be distinguished by the lighter shade of colora- 

 tion, and less heavy spotting above, and by the shape of 

 the large patch nearest the costa on the band of the 

 hind wing below, which in eleven specimens had the 



1. A, helena : costa of hind wing below. 2. A. selenis : costal patch 

 of hind wing below.* 



shape shown in the annexed cut, whilst one only was 

 straight on the inside, as was the case more or less in 

 eleven specimens of selenis (see cut), of which ten were 

 from Siberia. 



A. selenis occurs in the Ural Mountains, and in various 

 parts of Central and Eastern Siberia to the Lower Amur. 

 The eastern form is rather larger and darker in colour, 

 and has been separated by Erschoff as var. sibirica, but 

 I have not seen sufiicient specimens from the Ural to say 



* The dark patch in the cut is really pale yellowish, and rather 

 exaggerates the difference between the species, being made from a 

 rough sketch of my own, and not from the actual specimens. 



