Niviventer tenaster (Thomas, 1916) . Ann. Mag. Nat. Hist., ser. 8, 17:425.

TYPE LOCALITY: Burma (Tenasserim), Mt Mulaiyit, 5000-6000 ft .

DISTRIBUTION: Mountains of Assam (India), S Burma (also possibly N Burma), and Vietnam.

SYNONYMS: champa.

COMMENTS: A large-bodied species that is sympatric with what has been identified as either N. bukit or N. fulvescens (Musser, 1981b) . Samples from N Burma, which Musser provisionally referred to as N. coxingi, are not that species and are similar in morphology to N. tenaster, but larger in body size and darker in fur coloration. To determine whether the N Burma population is a separate species or a geographic variant of N. tenaster, and the nature of the relationship of all these highland Indochinese populations with the large-bodied N. coxingi of Taiwan, will have to be resolved by careful systematic revision (Musser, 1981b). Robinson and Kloss (1922) described champa as a subspecies of Rattus bukit .