One day a boy brought me a butterfly between his fingers, perfectly unhurt. He had caught it as it was sitting with wings erect, sucking up the liquid from a muddy spot by the roadside. Many of the finest tropical butterflies have this habit, and they are generally so intent upon their meal that they can be easily be reached and captured. It proved to be the rare and curious Charaxes kadenii, remarkable for having on each hind wing two curved tails like a pair of callipers. It was the only specimen I ever saw, and is still the only representative of its kind in English collections. [1]archive copy at the Wayback Machine
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{{Information |Description={{en|1=Caption reads "Caption reads "CALLIPER BUTTERFLY"}} |Source=1890 (10th) edition, from [http://www.papuaweb.org/dlib/bk/wallace/03.jpg PapuaWeb] |Author=Drawn on wood by T. W. Wood |Date=1869 |