156 BUTTERFLIES AND MOTHS 



euphrosyne, but this fact would not be a 

 reliable guide to identity. Neither is the 

 appearance of the upper side of the wings 

 to be depended upon, although an experienced 

 eye can detect points of difference. Both 

 are reddish-brown with black spots. They 

 can be best distinguished by a comparison 

 of the under sides, and to enable this to 

 be done I have drawn two figures with the 

 wings closed. They may be sought upon 

 heaths and in open glades amongst trees, 

 especially at damp places overgrown with 

 rushes. 



A few butterflies belonging to Alpine 

 genera are established amongst our moun- 

 tains. Of these the best known is the Scotch 

 Argus (Erebia sethiops), Plate XVI., Fig. 6, 

 which is abundant in localities that suit it. 

 It is so dark a brown that it seems to be 

 black, and is marked with light-russet patches, 

 each containing several eye-spots. The under 

 side bears a streak, which is coloured bluish- 

 ash, but never white. A white streak is the 

 badge of a much rarer insect, the Arran 

 Brown (Erebia ligea). 



On heaths one meets two very similar 



