Mammals collected in Turkestan. 263 



17. Microtus (Micr.) ravidulus, Mill. 



6. 123,124; ?. 120, 122. Ak-sai Plateau, 120 miles 

 N.E. of Kashgar. 11,000'. 



Practically topotypical of Miller's species, which was 

 described from Ok-chi, in the valley of the Ak-sai River, at 

 7500'. 



18. Microtus (Pi'ti/mi/s) carruthersi, sp. n. 



c?. 105, 108, 109, 110 ; ? . 106, 107, 116. tlissar Mts., 

 100 miles E. of Samarkand. 9000-10,000'. 



Apparently allied to the European subgenus PitymySy but 

 with mammpe and some dental resemblances to Phaiomys. 



Size rather large for a Pitymys. Fur long, very soft and 

 fine ; hairs of back about 12 mm. in length. General colour 

 above near " broccoli-brown," but varying a good deal in the 

 different specimens. Under surface dull whitish, the slaty 

 bases of the hairs showing through. Ears faiily long, quite 

 evident beyond the fur, pale brown. Hands and feet dull 

 whitish above ; claws rather longer than in ordinary Pitymys^ 

 but not so long as in Phaiomys ; soles apparently with only 

 five pads, their posterior part thickly hairy. Tail fairly 

 long, more than twice the length of the hind foot, well but 

 not heavily haired, brown along its middle line above and at 

 the end, dull whitish on sides and below, lllammje 2 — 2 = 8. 



Skull lightly built, low, smooth, rounded, not ridged, its 

 geneial shape not very unlike that of M, (P.) mojori, but the 

 brain-case is shorter and the face more developed. Nasals 

 very broad anteriorly, tapering behind. Palatal foramina, 

 posterior palatal region, and bullcC all about as in that species. 



Tooth-pattern quite as m Phaiomys, as figured by Miller*, 

 m^ being similarly bilaterally symmetrical, though the 

 middle section is even less constricted in the middle line. 

 Below the anterior molar is quite like Miller^s figure, except 

 that there is usually a small extra external angle at the 

 middle of the long anterior lobe, making five salient external 

 angles to the tooth. 



Dimensions of the type (measured in the flesh) : — 



Head and body 101 mm. ; tail 39 ; hind foot 16 ; ear 13. 



Skull : greatest length 24:*5 ; basilar length 22 ; zygo- 

 matic breadth 14 ; nasals 6'1 x 3'6 ; interorbital breadth 3'7; 

 palatilar length 13*5; diastema 8*3; palatal foramina 4*6; 

 upper molar series (crowais) 5'7. 



Hah. as above. 



* N. Am. Faun. no. 12, p. 57 (1806). 



