1,7B »TR.. OLDFIELD THOMAS OX 



brown. H:anrl& and feet dull white. Tail well-haired, brown 

 above, dull white on sides and below. 



Skull and teeth as indicated above. 



Dimensions- of the type : — 



Head and body 103 mm. ; tail 41 ; hind foot 18 ; ear 13. 



Skull : basal length (c.) 26 ; greatest breadth 16 ; nasals 

 7r-6x3-2; interorbitai breadth 3-6; breadth of brain-case 12-2; 

 palatilar length 13-7; diastema 8; palatal foramina 6; upper 

 molar series (ci^owns) 6'8.. 



Hab. and Type as above. 



Interesting and pecvilian as this species is in essential characters, 

 it is externally a very ordinary-looking Yole, and indeed scarcely 

 distinguishable from Microtus vialcolmi, which Mr. Anderson found 

 ill some numbers in the s-aine region,. 



41.. MYOSPAiiAX cANSus Lyon. 



d. 2263, 2272, 2274. ?■.. 2262, 2264, 2265, 2266, 2267, 

 2268, 2271, 2275, 2276.. 10 miles S. of Tau-chow, Kan-su. 8500'. 



These are practically topotypes- of Dr. Lyon's species, and a 

 study of them shows that the series obtained in Shen-si by 

 Mr.. Anderson, and previously referred to M. ccmsus'*, should 

 be subspecifically separated. 



The form may be called : — 



MyOSPALAX CANSUS SHENSEIUS. 



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



General characters as in true ccmsus, but the colour wai'mer and 

 the tooth-row longer.. 



Taking only full-coloured specimens into comsideration the 

 coloured ends of the hairs above approach " ochraceous-butf," 

 while in cansus they average distinctly paler, approximating to 

 " pinkish-bufF." As to the tooth-row, among seven adult specimens 

 of true 6■a«s^(s (including three well-grown males)the alveolar length 

 of the upper series never exceeds lO'O mm., while of 16 specimens 

 of she7iseius some (males) may almost reach 12-0 mm., while nearly 

 all, including females, are ITO and upwards. One fully adult 

 specimen only, a female, has the dimension 10"0. 



Dr. Lyon's type, a male (although originally called a female), 

 seems to have been unusually large, as its tooth-row mea,sures 

 about that of a female sheiiseius, and therefore more than any 

 of our specimens of the Kan-su form. This Avould, however, 

 appear to have been an exceptional specimen. 



Dimensions of the type : — 



Head and body 178 mm. ; tail 54 ; hind foot 30. 



Skull: condylo-basal length 45 ; zygomatic breadth 34; nasals 

 18x7"7; interorbital breadth 6'5 ; palatilar length 23*5; upper 

 molar series (crowns) 11-4, (alveoli) 11-9. 



Hah. Shen-si. Type from Yu-lin-fu. 



* P. Z. S. 1908, p. 978. 



