Sundasciurus fraterculus (Thomas, 1895) . Ann. Mus. Civ. Storia Nat. Genova, Ser. 2a, 14:669.

TYPE LOCALITY: Indonesia, Mentawi Isis, Sipora Isl, "Sereinu" .

DISTRIBUTION: Sipora Isl, Siberut Isl, and N Pagi Isl (Sumatra, Indonesia) .

SYNONYMS: pumilus (Miller, 1903); siberu (Chasen and Kloss, 1928).

COMMENTS: Formerly included in lowii (Chasen, 1940:144); but see Moore (1959). Geographic variation reviewed by Jenkins and Hill (1982). Part of the rodent fauna endemic to the Mentawi Archipelago (see comments under Leopoldamys siporanus).