Abstract: In a small mammalian survey conducted in eastern Qinghai Province during from May to September,1983,6 specimens of Tibetan Pika were collected. After a careful study, we considered them to be new to science and propose to name them as:Ochotona thibetana xunfiwaensis,nov.subsp.Holotype.l ♀,No.83042,ad.,collected from Mongda Tian-chi(alt.2400m), Xunhua County,in the eastern frontier of Qinghai,on June 18,1983.Kept in the Institute of Research and Control of Local Diseases of Qinghai Province, Xining, Qinghai. Paratypes. 6 ♂♂♂♂,Nos, 83029,83030,83043,83049,83051, 83052,ad., collected from the same locality as the holotype on June 16-20,1983.Depsoited in the Institute of Research and Control of Lccal Diseases of Qinghai Province, Xining,Qingha.i and in the Institute of Zoology,Academia,Sinica, Beijing.Diagnosis. The new subspecies is distinguished from O.t.thibetana,O.t. sacraria,O.t.lhasaensis and O. t. aliensis by its more flattened frontal and parietal bones and a lesser depth of skull(see Table 3).O.t.xurihuaensis resembles O.t.huangensis in the colour of the upper surface,but its underparts in the summer are greyish white or dirty white instead of ochracous or dirty buff.Its mastoid width of skull is also broader (17.8±0.19,n=6)than that of O.t.huangensis is(16.6±0.15, n=15).This subspecies differs from O.t.nangqenica in having its dorsal surface of brown colour,while in the latter subspecies the back and rump are dull mouse-greyish brown without any rufous tint. Besides,the ears of the new subspecies are smaller (usually less than 20mm, on average) than the latter (over 20mm).Specimens examined. (1)O.t.thibetana,42♀♀,44♂♂,western Sichuan, northwestern Yunnan and eastern Xizang (Tibet) ; (2)O. t. sacraria, 14♀♀, 6♂♂,western Sichuan(3)O.t.huangensis, 12♀♀,23♂♂,Taibaishan,Qinling (Tsingling)Mountains,southwestern Shaanxi;(4)O.t.Thasaensis,7♀♀,8♀♀ 2♀♀,southern Xizang(Tibet);(5)O.t.aliensis,10♀♀,22♂♂,western Xizang (Tibet);(6)O.t.nangqenica,6♀♀,8♀♀,southern Qinghai.

摘要： 青海省地方病防治研究所动物病调查队于1983年5—9月在青海东部进行动物病调查时,采到一些藏鼠兔(Qchotona thibetana)标本,鉴定后,发现系一新亚种,现报道如下。