关键词: 奴布拉鼠兔, 分类, 订正

Abstract: O．nubrica was described as a species by Thomas (1922). The tyro was from Ladak．alone the Nabra Valley，down to Pangkong Lake of Xizang (Tibet) in China．Ognev (1940) regarded it as a instinct speices，and then it was placed in synonymy with O．royteI(Areyropulo，1948；Gureev，1964；Honacki et al., 1982) or a subspecies of 0.pusilla (Ellerman et Morrison Scott, 1951)．Cerbet(1978) assigned it to the 0，thibetana．Chapmas et a1．(1991)recognize it as a independent species recently.
Corbet (1978) placed O．Iama Mitchell and Punzo 1975 in O roylei and Honacki et al., (1982) regarded it as a distinct species．0.lama and O.t.aliensis Zheng 1979 was then combined as O．t．tama by Feng and Zheng (1985, 1986).
It was need to make clear in taxonomy of these pikas，so we examined many specimens．
As a result of this revision we recognize O．nubrica as a independent species based on its orginal discripition and topotypes．
O．nubrlca is larger than O．thibetana but smaller than 0．roylei and the pelage color is much pa1er than the former and mere drabby than the later．
The skull of O．nubrina is fairly bow，palatel foram ina was widely expanded posteriorly．The bullae are relatively larger and higher than 0．thibetana，but smaller than O，roylei．
The scattergram also shows the difference among O．nubriea，0．thibetana and O．roylei(Fig．1- 3).
According to the skull characters，O．nubrica can be divided into two subspecies：0.nubrica nubriea and O.n.lhasaensis．The bullae of the former is larger than the later．The mastoid width is larger than thet zygomatic width in 0.n.nubricawhile O．n. lhasaensis is reversed．
0.lama and O ．t.aliensis is placed in synonymy w ith O．n．nubrica on the based of its larger bullae．

Key words: Nubra Pika (Ochotona hubrica), Classification, Revision