Niviventer excelsior
Range
South-western China: Sichuan, north-western Yunnan and the Ailao Mountains
The Sichuan white-bellied rat, also called the large white-bellied rat or Sichuan niviventer, is found only in south-western China. It occurs in Jiuzhaigou National Nature Reserve in Sichuan, south-western Sichuan, north-western Yunnan and the Ailao Mountains of Yunnan (Wikipedia, general species account). The source is a brief stub with no description or habits.