SINO-MONGOLIAN FRONTIER 



mously larger bullae," than in the other two 

 species, of which M. unguiculatus is entirely 

 diurnal and M. psammophilus partly so. 



M. auceps has also been recorded from 

 North Shensi, as well as from the Ordos 

 Desert itself. 



Chinese name " Huang hsu," meaning 

 " Yellow rat." 



17. Meriones psammophilus, M.-Edw. 



Eight specimens, 6 \^S, 2 ??. 5 miles S. 

 of T'ai-yiian Fu, Shansi. 2,600 ft. 



Two specimens, ^S' 20 miles N.W. of T'ai- 

 yiian Fu. Shansi. 3,950 ft. 



A very common species in these districts. 

 It inhabits sandy places, from which fact it 

 derives its name. It is smaller than either 

 of the other two gerbils already mentioned, 

 though in colour it more closely resembles 

 M. auceps. 



Chinese name as in M. auceps. 



18. Meriones unguiculatus, M.-Edw. 



Two specimens, S, ?• Tabool, 100 miles N. 



of Kalgan, Mongolia. 4,000 ft. 

 This gerbil differs from the first named 

 species in being of a more sandy colour, in the 

 absence of the white underparts, and in the 

 smaller bullae. It is found in the Ordos 

 Desert and in Northern Shansi, as well as in 

 193 o 



