106 MR. OLDFIELD THOMAS ON MAMMALS [Feb. 18, 



one locality, about 70 miles from Kalgan, tliey have a large 

 colony, and there the burrows are about the sides of mounds 

 overgi'own with bush-grass. At Taboul I found them living 

 about the hill-sides, and their burrows not distinguished from 

 those of other mammals." — M. P. A. 



3. Meriones unguiculatus M.-Edw. 



6. U73, 1478, 1485, 1486, 1489, 1492, 1495, 1506, 1507, 

 1514, 1539. 



$. 1464, 1469, 1470, 1471, 1474, 1496, 1505, 1511, 1512. 



A female in spirit, with 2 — 2 = 8 mammfe. 



These specimens quite agi-ee with a typical specimen in the 

 Museum from " Chinese Mongolia " received from the Paris 

 Museum. None of them shows any approximation in the 

 character of the claws to an example of M. pscwimophilus 

 M.-Edw., which was collected in the near neighbourhood of 

 Ivalgan, but which Mr. Anderson did not chance upon. 



"This, the most abinidant mammal, was litertilly almost every- 

 where throughout this part of Mongolia. They are diurnal to 

 some extent, but may be most fi'equently seen between sunset 

 and dark, when they sit spermophile-Iike befoi'e their buii-ows. 

 I frequently succeeded in approaching within about eight feet of 

 a sitting individual, during which mano?uvre the animal wovild 

 eye me steadily and, finally, with one rapid move, plunge into 

 his hole, but reappear after a few moments if I remained per- 

 fectly still. These animals make a curious sound beneath the 

 eartii ; it sounds verj^ much like the distant galloping of a horse 

 on a hard i-oad, and I was much puzzled about it for some days. 

 How the sound is produced I do not know." — J/. P. A. 



4. MUS WAGNERI MONGOLIUM, Subsp. n. 



c?. 1472, 1520. $. 1480, 1481, 1484, 1532. 



A white-bellied Mouse of the muscidus group, not so pale as 

 true icagneri. 



General colour above i^ither paler than Ridgway's " broccoli- 

 brown," the light rings on the hairs below '• ecru-drab " and 

 pinkish bufi'; sides rather paler than back, but not approaching to 

 clear bufty of true wagneri. Whole of under surface, hands, and 

 feet pure white, the hairs white to their bases ; line of demarca- 

 tion on sides very sharply defined. Eai'S like head, tlieii- proectote 

 little darker'. Tail rather short, inconspicuously bicolor, brown 

 above, dull whitish on sides and below. 



Dimensions of the type, measured in the flesh : — 



Head and body 82 mm. ; tail 50 (range up to 56) ; hind foot 

 15*5 ; ear 12-5. 



Skull — greatest length 21-5 mm. ; basilar length 17; zygomatic 

 breadth 11-3; nasals 7-9 ; palatilar length 9-5; palatal foramina 

 4*7 ; length of upper molar series 3*3. 



r?//;e. "old female. B.M. No. 8.3.5.36. Original number 1484. 

 Collected 28th July, 1907. 



