MAMMALS FROM WESTERX CHIXA. 173 



Type. Adult female, B.M. No. 11.2.1.180. Original number 

 2296. Collected 8 May, 1910. 



This Mouse is readily distinguishable from any of the forms of 

 agrariiis by the entire absence of a dorsal line, some trace of a line 

 being perceptible in all the available specimens of A. agrarius 

 ningpoensis, the form in which it is least developed. Even then 

 I should like to call it a subspecies of agrarius, but do not 

 venture to do so without seeing intermediate specimens. The 

 type was obtained at or near the same locality as a well-marked 

 example of A. agrarius pallidior (no. 2292), so that in this region 

 at least there seems to be iio intergi'adation, 



I have named this animal after the Rev. W. N. Fergusson, 

 from whom the Museum has received four specimens of it, 

 collected at Yin-shin-wan, N.W. of Chong-tu, in 1909. 



34. Cricetulus andersoxi Thos. 



d. 2215, 2216. $.2217. 60miles S.E. of Min-chosv, Kan-su. 

 2 . 2225, 2233. 10 miles S. of Tau-chow, Kan-su. 



35. MiCEOTUS IRENE. 



Thos. Abstr. P. Z. S. 1911, p. 5 (Feb. 14). 



S. 2383, 2386, 2397, 2400, 2404. $. 2384, 2385, 2392, 

 2395, 2396, 2398, 2399, 2401, 2402, 2403. Ta-tsien-lu, W. 

 Sze-chwan. 9000-12,000'. 



Rather larger than M. arvalis. M^ with the same spaces con- 

 nected as in Fitymys. 



Fur soft, fine, rather woolly ; hairs of back about 9 mm. in 

 length. General colour above brown, under surface slaty 

 washed with greyish white ; not sharply defined lateiuUy. Ears 

 projecting beyond the fur, uniformly brown. A small lateral 

 gland present on each side in front of the hips in the males. 

 Hands and feet brownish white ; soles with six pads. Tail about 

 twice the length of the foot ; brown above, paler on sides and 

 below, not so strongly contrasted as in M. malcohni. Mammae 

 2—2 = 8. 



Skull of the usual flattened shape, its upper outline straight or 

 even slightly concave over the orbits. Brain-case remarkably 

 small in proportion to the face, smooth, rounded, its ridges and 

 angles scarcely developed ; muzzle slender, scarcely bowed down- 

 wards ; interorbital space unusually narrow, smoothly rounded. 

 Palatal foramina fairly long. Posterior palate normal, the lateral 

 pits not specially deep ; mesopterygoid fossa of normal breadth, its 

 anterior border rounded. Bulhe decidedly smaller than in most 

 species of this size. 



Incisors of medium strength, considerably bevelled in front. M^ 

 with pattei-n very similar to that figured by Blasius in M. savii 

 (Faun. Deuts. fig. 221, p. 394). M^ with only four closed spaces, 

 the fifth and sixth (counting from behind and including the 

 posterior transverse space) opening into each other (as in Fitymys) 



