29. 
SINO-MONGOLIAN FRONTIER 
Four specimens, 2 gg, 2 92. Tabool, 100 
miles N. of Kalgan, Mongolia. 
This interesting vole, belonging to the 
“* Stenocranius”’ group, was described by 
Mr. Thomas from a single specimen taken by 
Mr. Anderson in this district in 1907. This 
vole differs from the following species in the 
extreme narrowness of its skull. 
I found them comparatively common, 
but so voracious that many trapped speci- 
mens were completely destroyed by their 
companions before I could secure them. 
They seemed to be nocturnal in their habits. 
Their burrows usually ran just under the 
earth’s. surface for a considerable distance, 
the broken up earth marking their course as 
in the case of the excavations of moles and 
mole rats. They appear to live in colonies 
much as do the gerbils. 
Microtus mandarinus, M.-Edw. 
One specimen, g. 5 miles S. of T’ai-yiian 
Fu, Shansi. 2,600 ft. 
It has been found impossible to separate this 
single specimen from M. mandarinus, though 
their localities are so far apart. This is 
evidently a somewhat rare species in Shansi. 
It is readily distinguishable from any of the 
following species by its powerfully built 
skull. In colour it resembles M. johannes. 
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