Erem ias 



341 



is uo Jifference iu shape of tlie head between youug specimeus from 

 Pekin, 35 millim. long without the tail, referable to the two forms. 

 The secoud and more important character resides in the larger dorsal 

 scales, there being 39 to 46 across the middle of the body iu 

 E. brenrhleyi, and 46 to 62 iu E. aryiis : there is thus an overlap, 

 which would probahlv he greater if more specimens of the former 

 could be examined. In all other respects the two forms agree, the 

 further differences pointed out bv J. CI. Fischer being merely 

 individual. 



Apart from the character of the subocular, the var. hreiichleiji may 

 be defined as combining a usually lower number of scales across the 

 body, a somewhat flatter head with a more pointed snout, a usually 

 longer tail, and the presence of a dark lateral band edged above by a 

 series of ocellar spots and below by an interrupted white streak. 



Habitat. — Mongolia and Northern China. 



