EATS AND MICE. 69 



The other species, Cricetulus campbelli, resembles the Ordos ham- 

 ster in, shape and size, but. differs in being of a pretty grey colour with 

 a yellow line down each side of the body and a black stripe down the 

 middle of the back. It was discovered in Inner Mongolia by an ex- 

 plorer named Campbell, after whom it was named. 



Our next group, the voles, includes over a dozen species. In 

 the short space available it is impossible to go into detailed descrip- 

 tions of all of themi. 



As a class voles differ from the hamsters in not having cheek 

 pouches and from the true rats in having short tails and short ears, 

 and from both in having heavier, wider and shorter skulls There are 

 of course many other distinguishing features, notably in the teeth 

 formations, but for our purposes the above differences will serve. 



In Chihli, so far as I know only one species has been recorded, 

 though doubtless there are many more. This is Craseomys regulus, 

 a large rich coloured vole which was first discovered by Anderson in 

 Corea and subsequently found at the Imperial Tombs east of Peking. 

 In .Shansi another species of the same genus was discovered by the 

 same collector in 1907. It was called Craseomys shanseius. These 

 voles are about four inches in length, and are of a rich red-brown 

 colour. They live amongst rocks in well wooded areas, where the 

 complicated ramifications of their runs may be found under the thick 

 moss. 



The second genus, Microtus, is very well represented. Two 

 forms of voles belonging to it are found in Inner Mongolia, namely 

 Microtus angustus, a long, narrow-headed vole, and Microtus warring* 

 toni, a camp-inhabiting species, which was named after Mr. F. W. 

 Warrington, who accompanied me on the trip during which it was 

 discovered. Both of these species are of a sandy yellow colour, the 

 first being somewhat darker than the second. 



In ,Shansi this genus is represented by at least three species. Of 

 these Microtus johannus and Microtus pullus were both new discoveries 

 of mine. The third, which was first discovered by David is known 

 as Microtus mandarinus. This species has a very big heavy skull for 

 its size, and inhabits the plains. 



M. johannus and M. pullus are mountain inhabiting species. The 

 former is of a pale sandy-brown colour, and keeps to open mountain 

 tops, while the latter is very much darker and lives in the forested 

 areas. 



In Kansu the genus is represented by two recently discovered 

 species. One, named M. malcolmi after its discoverer Mr. Malcolm 

 P. Anderson, differs from all the foregoing in having a very much more 



