176 MR. OLDFIELD THOMAS ox 



internal lobes ou m^ and m'^ veduced to minute and scarcely 

 perceptible projections. 



Type, Microtios Inez Tlios. , 



Now that a third species, essentially similar to M. inez and 

 M. nux, has turned up, I think it advisable to form a special 

 subgenus for the reception of the three. On first describing 

 M. inez * I purposely delayed making a new subgeneric name 

 until we had evidence as to the existence of other species allied 

 to that peculiar species, but full details were given as to its 

 characteristics.] 



Allied to M. {C.) inez and nux, but with much longer tail. 



Form slender, the general proportions, chiefly owing to the 

 unusually long tail, looking very different from those of the allied 

 species. Fur long, soft, and fine ; hairs of back neai-ly 10 mm. in 

 length. General colour above pale brown, greyer than in nux 

 and inez, the type nearly approaching " broccoli- brown," but other 

 specimens of a warmer tint. Under surface rather variable, 

 greyish slaty, washed Avith buffy whitish or drab. Ears about as 

 long as the fur, and of about the same colour. Hands and feet 

 white ; soles with six pads. Tail remarkably long for a Vole, 

 nearly as long as the body without the head ; dark brown above, 

 dull whitish below. 



Skull very like that of M. nux, except that it is smoother and 

 more lightly built ; but even this may be a question of age. 



Teeth almost exactly as in M. nux ; second and third spaces of 

 m^, and first and second of m^, communicating with each other — 

 all the other triangles closed (except, of course, in the case of m^). 



Dimensions of tlie type : — 



Head and body 88 mm. ; tail 50 ; hind foot 16-5 ; ear 12. 



Skull : condylo-basal length 22'6 ; basilar length 20'5 ; gi-eatest 

 breadth 13'5; nasals 6'8 ; interorbital breadth 4; breadth of 

 brain-case 11*2 ; palatal length 10*6 ; palatal foramina 41 ; upper 

 molar series (crowns) 5. 



Hah. as above. 



Type. Adult male. B.M. No. 11.2.1.223. Original number 2238. 

 Collected 3 April, 1910. 



This Yole is at once distinguishable from all its allies by its 

 remai'kably long tail. 



39. MiCROTUS (EOTHENOMYS) MELANOGASTER M.-Edw. 



S. 2284, 2290, 2291, 2297, 2304, 2306, 2307, $. 2298, 

 2299, 2300, 2303. Wen-hsien Country, S. Kan-su. 



c5' . 2421 (melanoid). 45 miles S.W. of Ya-chow, Sze-chwan, 

 4000'. 



$. 2461. Omi-san. 6000'. 



I fail to find any tangible difference between thti Kan-su series 

 and the two specimens from Sze-chwan, which la'tter are nearly 

 topotypical of the species. 



* P. Z. S. 1908, p. 970. 



