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Range DescriptionSaimiri ustus occurs south of the Rio Amazonas in Brazil. It has more restricted range than was supposed by Hershkovitz (1984), who placed it east of the Rio Purus south as far as the region of the rios Sepatini and GuaporÃ©, east to the Rios Xingu or Iriri. J. S. Silva Jr. (pers. comm.) believes it extends east of the Rio Purus to the riosTapajÃ³s and Juruena, with its range including a belt along the southern margin of the Rio SolimÃµes along the lower reaches of the southern tributaries, including the rios CoarÃ and TefÃ© to the east (left bank) of the Rio JuruÃ¡. It extends south to the upper reaches of the Rio GuaporÃ© and the headwaters of the Juruena. It is replaced by Saimiri sciureus sciureus just south of the Rio Amazonas, east of the TapajÃ³s, on the Ilha Tupinambarama, east to Parintins.