Rattus sikkimensis Hinton, 1919 . J. Bombay Nat. Hist. Soc., 26:394.

TYPE LOCALITY: India, Sikkim, Pashok, 3500 ft .

DISTRIBUTION: S China (incl. islands of Hong Kong and Hainan), Vietnam, Laos, Cambodia, Thailand (incl. Koh Klum off SE Thailand in the Gulf of Siam), C and N Burma, NE India (Sikkim, Darjeeling, Bhutan), and possibly E Nepal. Not recorded on the mainland of peninsular Thailand south of Isthmus of Kra (10°30'N), but occurs on four islands (Koh Tau, Koh Pangan, Koh Samui, and Koh Kra) off the coast well south of the Isthmus (see map in Musser and Heaney, 1985).

SYNONYMS: hainanicus, klumensis, koratensis, kraensis, remotus, yaoshanensis.

COMMENTS: Originally described as a subspecies of R. rattus (Hinton, 1919), then listed as a synonym of R. r. brunneusculus (Ellerman, 1961) . South Vietnamese samples discussed under R. sladeni (Van Peenen et al., 1969), N Vietnamese series under R. koratensis (Dao, 1985), and Thai samples under R. koratensis and R. remotus (J. T. Marshall, Jr., 1977a) .