Neacomys spinosus (Thomas, 1882) . Proc. Zool. Soc. Lond., 1882:105.

TYPE LOCALITY: Peru, Amazonas Dept., Huambo, 3700 ft .

DISTRIBUTION: C and W Brazil to Andean foothills and lowlands of E Colombia, Ecuador, and Peru, probably including E Bolivia.

SYNONYMS: amoenus, carceleni, typicus .

COMMENTS: Karyotype compared to other oryzomyines by Gardner and Patton (1976).