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Archduke (butterfly)
The Archdukes are a genus (''Lexias'') of tropical forest-dwelling butterflies that are common throughout Southeast Asia and Australasia. Members of the brush-footed butterfly family Nymphalidae, the genus is represented by about 17 species. Two very similar and coexisting genera are ''Tanaecia'' (the Viscounts and Earls) and ''Euthalia'' (the Barons and Counts), the latter previously including some ''Lexias'' species. The largest species reach a wingspan of ca. .
==Description==
''L. pardalis'' and ''L. dirtea'' are also among the most colourful Archdukes. Sexual dichromatism is however extreme, with the two sexes appearing entirely different. The males' dorsal wing surfaces are a dramatic combination of velvety black forewings and metallic blue-green to violet covering the margins of the forewings and hindwings. The females' dorsal wing surfaces are a drab brown, with small yellowish white spots. Both sexes have drab ventral wings, presumably as a means of camouflage. The dramatic colours of the males are thought to play a role in intraspecies communication, both by signalling to other males when defending territory, and by attracting females.
''Lexias pardalis'' and ''Lexias dirtea'', two commonly farmed species, are nearly identical and often confused, but they can be distinguished by their differing antennae: the dorsal surface of ''L. pardalis antennae tips are yellow-orange, whereas they are black in ''L. dirtea''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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