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Range DescriptionA montane night monkey, occurring in the Cordilleras Central and Oriental, from about 1,000 to 1,500 m upward to the treeline at 3,000 to 3,200 m (Hernndez-Camacho and Cooper 1986). Following the range map in Defler (2003, 2004), it extends south as far as region of the headwaters of the rios Caquet and Orteguaza. Tirira (2007) provisionally regards the montane night monkeys occurring in the subtropical humid forest along the Cordillera Oriental of the Andes (altitudes 940-1,800 m) as belonging to this species, although he points out (p.160) that its identity has yet to be confirmed. There are few records and all are based on sightings in the wild; the few museum specimens have yet to be studied in this regard. The possibility remains that it may be a variant of A. vociferans occurring otherwise throughout eastern Ecuador and adjacent northern Peru (Aquino and Encarnacin 1994a), or even an as yet unrecognized, distinct species.