Subspecies and Distribution. S. b. boliviensis 1. Geoffroy Saint-Hilaire & de Blainville, 1834 — upper Brazilian Amazon S of the Rio Solimoes, from between the rios Jurua and Tefé extending S into SE Peru (S of Rio Abujao, Ucayali Department) and N Bolivia W of the Rio Guaporé (Beni, Cochabamba, Pando, and Santa Cruz departments, including the upper Madeira Basin), at elevations of 50-500 m. S. b. peruviensis Hershkovitz, 1984 — N & C Peru, S of the Rio Maranon-Amazonas, from the W bank of the Rio Tapiche W to the Rio Huallaga, and S through the departments of San Martin and of Huanuco (to c.10° S), and Ucayali (between the rios Pachitea and Tambo, at least as far as the Rio Abujao); also possibly in Brazil (Amazonas State), at elevations of 90-800 m. in Cebidae

Subspecies and Distribution. S. b. boliviensis 1. Geoffroy Saint-Hilaire & de Blainville, 1834 — upper Brazilian Amazon S of the Rio Solimoes, from between the rios Jurua and Tefé extending S into SE Peru (S of Rio Abujao, Ucayali Department) and N Bolivia W of the Rio Guaporé (Beni, Cochabamba, Pando, and Santa Cruz departments, including the upper Madeira Basin), at elevations of 50-500 m. S. b. peruviensis Hershkovitz, 1984 — N & C Peru, S of the Rio Maranon-Amazonas, from the W bank of the Rio Tapiche W to the Rio Huallaga, and S through the departments of San Martin and of Huanuco (to c.10° S), and Ucayali (between the rios Pachitea and Tambo, at least as far as the Rio Abujao); also possibly in Brazil (Amazonas State), at elevations of 90-800 m.