sjnall Mammals from Djarhent. 569 



Skull nearly as large as in amphibius, but with the fossorial 

 characteristics of that of tei-restris not only well marked but 

 intensified ; the incisors even more thrown forward and the 

 supraoccipital area so slanted forward that in vertical view it 

 equals the interparietal in apparent extent. In amphibius it 

 is scarcely visible at all from above, in sapidus and terrestris 

 it appears decidedly less in extent than the interparietal, and 

 only in the small and nearly completely fossorial scherman 

 does it equal the interparietal as in scythicus. Though large, 

 the skull is not higlily ridged, certainly less so than in 

 ampthibius. 



Teeth about as in terrestris, the incisors slightly more 

 thrown forwards. M^ consisting of only three triangles and 

 a simple posterior lobe, as in Scandinavian terrestris (cf. 

 Blasius's figure 188*). 



Dimensions of the type (measured in flesh) : — 



Head and body 200 mm.f; tail 130; hind foot 34. 



Skull : condylo-basal length 42 ; condylo-incisive length 

 42-5 ; zygomatic breadth 24'8 ; uasals li'6x4'7j palatilar 

 length 22'6 ; upper molar series 9'6. 



Type. Old female. B.M. no. 14. 5. 10. 154. Original 

 number 255. Collected 5th May, 1913. 



This water-vole is a large race of the Scandinavian A. ter- 

 restris, with which it agrees in its more essential characters. 

 It will probably be found to be the form which occurs 

 throughout Asiatic Russia. 



The striking revision of the water-voles recently published 

 by Mr. Miller \ has alone enabled me to appreciate the true 

 relationship of this fine animal. 



24. Microtus {Microtus) ilceus, Thos. 



Nineteen specimens. 



The type of this well-marked species was in the first 

 collection sent by Mr. Rlickbeil (B.M. no. 11. 12. 14. 30), 



The specimens are labelled as having been caught alon^ 

 the banks of the Uszek and Hi Rivers. 



Some of the skulls have an unusually long median spike 

 at the posterior end of the palate, while in others this is 

 entirely absent. 



25. Microtus (3Iicrotus) ohscurus^ Eversm. 

 Thirty specimens. 



* Siiug. Deutschl. p. 345. 



t This measurement is probably too large. Other specimens are 

 measured as 166, 167, and 178 mm. in trunk-length. 

 + Cat. Mamm. W. Europe, p. 724 (1912). 



