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Naturalist on the River Amazons figure . en Caption SCARLETFACED AND PARAUAC MONKEYS Uploaders note These are respectively the Bald Uakari Cacajao calvus and Saki monkey genus Pithecia possibly the Monk Saki Pithecia monachus and perhaps even more specifically Geoffroy's Monk Saki Pithecia monachus monachus information provided by