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In Darwin's Shadow: The Life and Science of Alfred Russel Wallace ...

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Figure 4-2 <strong>Wallace</strong>’s map <strong>of</strong> the Aru Isl<strong>and</strong>s. <strong>Wallace</strong> struggled to solve the<br />

species problem for the butterfly species Ornithoptera poseidon (top) <strong>and</strong><br />

Ornithoptera priamus (bottom) that featured black <strong>and</strong> iridescent green<br />

wings <strong>and</strong> two <strong>and</strong> three black spots respectively on each hind wing. (Map<br />

from <strong>The</strong> Malay Archipelago, 1869)

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