982 MR. OLDFIELD THOMAS ON [DeC. 15^ 



fact that the type-specimen is ISTo. 2000 of the Mammals collected 

 during the Exploration. 



" At Yen-an-fu we found these animals about a few bush-grown 

 burying-grounds in the main valley. They proved to be very shy, 

 for after trapping a few we suddenly found we could catch no- 

 more. My belief is that the remainder of the colony deserted the 

 place. ISTorth-west of Ching-pien Mr. Sowerby found Pika- 

 buri'ows again, but we secured no additional specimens till we 

 reached Ko-lan-chow, Shan-si. In this locality we did not find 

 them common, but in the vicinity of ISTing-wu-fu they are fairly 

 abundant. No. 2000, taken 23 June, contained four young with 

 hair, and evidently about to be born. 



"Chinese names : ' Ti-tu ' = Ground-Hare (at Yen-an-fu) ; ' Hao- 

 tu ' = Rat-hare (at Ko-lan-chow)." — M.P.A. 



In a previous paper* attention was called to the confusion 

 which had followed from the giving of two names, 0. ogotona and 

 0. daimrica, to the same animal by Pallas ; and it now appears that 

 this confusion has further resulted in the naming of Mr. Lyon's 

 subgenera -f- being inaccurate. The latter had assumed that the 

 animal described by Waterhouse as Lagomys ogotona was really 

 Pallas's species of that name, and consequently called the sub- 

 genus to which it belonged the typical Ochotona Link, based on 

 Pallas's animal. As already noted, however, Pallas's ogotona 

 was the same as liis earlier dauurica, and this is one of the species, 

 assignable to Mr. Lyon's Conothoa, so that the latter name becomes, 

 a synonym of Ochotona. 



The nomenclature of the subgenera would therefore appear to 

 be as follows : — 



1. Ochotona Link. Type, 0. dauurica Pall. 



Conothoa Lyon. ,, 0. roylei Og. 



(Incisive and palatal foramina united, open.) 



2. PiKA Lac. 1799. Type, 0. alpina Pah. 



Lagomys G. Cuv. 1800 (nee Storr, 1780). 



Type, 0. alpina Pall. 

 (Incisive and palatal foramina separate. Frontal outline 

 not abnormally bowed.) 



3. Ogotoma Gray, 1867. Type, . pallasi QiV2c^ . 

 (Incisive and palatal foramina separate. Frontal ovitline 



abnormally bowed.) 

 The last-named also includes 0. ladacensis Glinth. 



33. Ochotona sorella. 



Thos. Abstr. P. Z. S. 1908, p. 45 (Dec. 15). 



$. 1979. 20 miles S. of Ning-wu-fu, Shan-si. 6600'. 10 June, 

 1908. B.M.IS^o. 9.1.1.279. Tym. 



A very small species allied to 0. cansa Lyon. 



* P. Z. S. 1908, p. 109. t Smiths. Misc. Coll. xlv. p. 438, 1904. 



