Naturalist on the River Amazons figure 31, Josiah Wood Whymper

Caption: "scarlet-faced and parauacú 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 twas now. Date: 1863 (publication of first edition).