Thomasomys ischyurus Osgood, 1914 . Field Mus. Nat. Hist. Pubi., Zool. Ser., 10(12):162.

TYPE LOCALITY: Peru, Amazonas Dept., 65 km E Chachapoyas, near Uchco, Tambo Almirante, 5000 ft .

DISTRIBUTION: N to C Peru.