210 MR. J. LEWIS BONHOTE OX THE [NoV. 15^ 



OCHOTOXA OGOTONA (Pall.). 



Lepus ogotona Pallas, Glires, p. 59, pi. 3 (1778) ; id. Zoogr. i. 

 p. 157 (1811); Schreber, Saugthiere, iv. p. 915, pi. 239 (1792). 



Lagomys ogotcma (Pall.) Cvivier, Reg. Aiiim. p. 219 (1829)^ 

 Waterh. Mamm. ii. p. 17 (1848); Radde, Reisen Slid. v. Ost- 

 Sibiiien, i. p. 226 (1862). 



Laqomys jxdiasi Gray, Ann. Mag. iNat. Hist. ser. 3, xx. p. 220 

 (1867). 



Closel}" allied to 0. ladacensis, from which it differs in its much 

 gi'e}'er and lightei' colour ; the general colour above being of a pale 

 whitish grey, below white. There is a total absence of the rufous 

 hairs on the ears so conspicuous a feature in the foregoing species. 



The skull differs in no marked respect fi-om that of 0. ladacensis. 



Dimensions (approx. from skin). Head and body 165 mm. 

 (6" 7'" as given by Pallas); ear 21 ; hind foot 35. 



Shvll. Zygomatic breadth 25 mm. ; length of nasals 16 ; length 

 of molar series 10; interorbital breadth 3*5. 



Habitat. Mountains beyond Lake Baikal and Desert of Gobi. 



I have examined only one individual of this species, which, 

 except for its colour, very much resembles 0. ladacensis, of which 

 it may eventually prove to be merely an Eastern race. 



OCHOTOXA EKYTHROTIS (BUclm.). 



Laqomys erythrotis Blichner, Mamm. Przewalski, i. p. 165 

 (1890) ; id. loc. cit. pis. xxi. & xxiv. figs. 1-6 (1894). 



The following description is taken from Blichner, as I have been 

 unable to procure a specimen of this species. In summer the 

 general colour above is of a dull rusty red ; the head is similar in 

 colour to the rest of the body, but the frontal region is somewhat 

 lighter and the lips yellower. The ear is thickly clothed on both 

 sides wdth ferruginous hairs. The chin is yellowish, the chest 

 reddish, and the remainder of the under parts and feet white. 

 Ill its winter pelage, the lips and tip of the nose ai-e white,, 

 the sides of the face and frontal region ai'e whitish browai. The 

 eai's and a small patch immediately behind them are of a rusty red. 

 The remainder of the body above and below is greyish white 

 interspersed with blackish or browaiish hairs. 



The shull, compared with that of 0. ladacensis, is i-ather smaller ; 

 the muzzle is stouter and shorter, but the skull itself rather nar- 

 rower. According to Blichner, except for its narrower and more 

 slender build it closely resembles that of 0. rutila, the next species. 



Dimensions (after Blichner). Head and body 245 mm, ; ear 28 ; 

 hind foot 42. 



Skull. Greatest length 46-5 mm. ; basal length 37 ; zygomatic 

 breadth 23-7 ; length of nasals 15*8; length of molar series 8. 



Habitat. Gannsu and Burchan Budda Mts., N.E. Thibet. 



This species, although clearly belonging to the ladacensis group, 

 shows, in its external colouring, affinities towards Col. Ward's new 

 species, to be hereafter described. 



