934 



region of neck from that of back ; feet butt', soinewliat lighter 

 than outer surface of legs ; t-iil black or blackisli brown, sutiused 

 to a varying degree with buft', the light colour most conspicuous 

 at and near base. 



SJiuU. — Apart from its much greater size the skull of Marmota 

 marvwta resembles that of Cltellus citellus in most of its more 

 essential features. The depth at front of brain-case and in 

 interorbital region is relatively less, and in adult individuals 

 there is a well developed sagittal crest on posterior half of brain- 

 case, with the resvilt that dorsal profile while equally convex in 



Fig. 190. 

 Marmota tnarmota. Slightly reduced. 



front is noticeably flattened posteriorly as compax*ed with the 

 smaller animal. Ventral profile with no special peculiarities. 

 Outline of brain-case somewhat obscured by the enlarged 

 squamosals, the area of which, when skull is viewed from above, 

 considerably exceeds that of parietals ; constriction in front of 

 lambdoid region relatively wider and more evident than in 

 Citelhis citellus. Lambdoid crest high, sometimes projecting 

 backward sufficiently to conceal occipital region in dorsal view. 

 Occiput lower relatively to its width than in C. citellus, the arch 

 slightly pointed at middle and essentially as high as middle 



