neio Species o/Myopus//o//j Centra/ .U/a. 343 



Ml/opus saianicus, sp. n. 



Lemmm ohensis, Thoma?, Ann, & Mair. Xat. Hist. (8) ix., April 191 -^ 

 p. 401 (not of Brants). 



Tijpe. — All adult male (.skull with temporal ridi^es fused 

 into a salient iiiterorbital crest). B.M. 12. 4. 1. 126. From 

 the Syansk Mountains, 100 miles west of Lake Baikal. 

 Trapped on 12th June, liHO, by Mr. Douglas Carruthers, at 

 a height o\ 2200 feet, in wet moss, 



E.cternal characters. — In all essential respects the external 

 form is that of the genus. Size about as in M. morulas, but 

 with relatively larger head. The general colour is con- 

 siderably lighter and brighter than in J/! schisticolor. The 

 rusty mantle is much more extensive than in the Skandi- 

 iiavian species, and agrees exactly with Hollister's de.scriptiou 

 of that of M. morulas. As in the two cited specie.s, the 

 ground-colour of the remainder of the body is dark grey or 

 slate, but it is lightened in the present species by silver hair-^, 

 which are abundant everywhere, and particularly so on the 

 ventral surface; a few silver hairs also appear through the 

 rnsty mantle at one point on the rump. Ihe hands are like 

 the sides in colour ; the tail is black and the feet are daik 

 brown (near " sepia ") above ; the under surfaces of feet and 

 tail are lighter, near " liufFy brown.'' 



Culleciors measurements of type. — Head and body ^^ mm. ; 

 tail (without terminal hairs) 14*; hind foot (without 

 claws) IG ; ear 13 5. 



Skull and teeth. — Comiiared witli ^^. schisticolor, the upper 

 incisors are slightly stronger and a little more recurved ; in 

 section they make a ncaivr approach to those of Lemmus, in 

 that the outer part of the anterior face of each is wider, while 

 the narrower inner i)orti()n is rather sharply bent backwards, 

 80 that the wearing surface of each tooth tends to as.sunie 

 the peculiar tubular form which is so chaiacteii.stic of the 

 upper incisors of Lemmas. The check-teeth are noticeably 

 larger and broader than tho.se of M. schisticolor, but they 

 agree exactly in form. The skull differs from the iSkandi- 

 navian species m..st strikingly in its greatly enlarged and 

 globosely inflated auditory bullae. The rostrum is sliallower 

 and longer, with less steeply inclined na.sals, and the length 

 ot the diastema is a little greater. In correlation witii the 

 enlargement of the cheek-teeth and bullte, the ptcrvgoid fossie 

 are shortened. The posterior edge of the j.alate is gently 

 convex centrally, instead of being furnished with a small 



Given as " 21 " un label ; but this is obviously wrono- 



23* ^ 



