DistributionRead full entry
Range DescriptionAccording to Hershkovitz (1984) and R. Wallace (pers. comm. 2007), S. b. boliviensis occurs in the upper Amazon, south of the Rio Solimões-Amazonas, between the Rios Juruá and Madeira in the states of Amazonas and Acre, into Bolivia, west of the Rio Negro in northern Santa Cruz Department, in the departments of Pando, Cochabamba, Beni, and Santa Cruz. Wallace et al. (1998) did not find squirrel monkeys in the Noel Kempf Mercado National Park, and indicated that there are no records of this subspecies east of Perseverancia where they surveyed, on the Río Negro, although there are reports of it occurring as far east as the upper Río San Martín. In Peru, Aquino and Encarnación (1994) indicated its occurrence south from the Río Abujao, Department of Ucayali, to Bolivia, and in parts of Huánaco, Pasco, Junín and Cusco. Altitudinal range according to Hershkovitz (1984) is 50 to 500 m above sea level. It is not known which of the two subspecies may occur on the upper Rio Juruá, between the west (left) bank of the Jurua and the Río Ipixuna in Brazil and north of the Río Sheshea to the Rio Abujao in Peru (Hershkovitz 1984; Aquino and Encarnación 1994).
Saimiri boliviensis peruviensis occurs south of the Ríos Amazon and Marañón, between the Rios Huallaga and Ucayali, from the west bank of the Río Tapiche (tributary of the Ucayali), south between the Ríos Pachitea and Tambo (Hershkovitz 1984). Hershkovitz (1984) indicated that the southern limits were unknown, but presumed to be at least as far as the Río Abujao (a west bank affluent of the Río Ucayali). Aquino and Encarnación (1994) indicated the region of the Río Perené, a tributary of the Rio Pachitea. Aquino and Encarnación (1994) reported that is sympatric with Saimiri sciureus macrodon east of the Río Ucayali from about 04ºS southward to the Rio Abujao. In their map, S. b. boliviensis extends across the Rio Blanco to the Río Yavarí. Its occurrence in Brazil to the east of the Rio Javarí has not been documented.