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The Stygian ringlet (''Erebia styx'') is a butterfly belonging to the subfamily Satyrinae, the "browns", within the family Nymphalidae. It is found locally in the Alps on dry limestone slopes. It is very similar to the Styrian ringlet (''E. stirius'') and has sometimes been included in that species. ==Description== It has a wingspan of 46–56 mm.〔Whalley, Paul (1993) ''The Mitchell Beazley Guide to Butterflies'', Mitchell Beazley, London.〕 The upperwings of both sexes are mostly brown with reddish bands near the edge (postdiscal bands). The bands vary in size and may be dusted with brown in the males.〔Chinery, Michael (1998) ''Butterflies of Britain and Europe'', HarperCollins, London.〕 Within the bands are a variable number of eyespots (ocelli); these are black with white centres. The forewing has a large eyespot near the tip, often with two white centres. The hindwing has three or four spots.〔 The underside of the male's forewing is largely orange with brown dusting in the basal half and a brown border. Unlike in the Styrian ringlet, the brown border does not taper towards the rear of the wing and has a dark "tooth" projecting into the orange〔〔Tolman, Tom & Richard Lewington (2008) ''Collins Butterfly Guide'', HarperCollins, London.〕 The tooth is less conspicuous in the females. The underside of the hindwing is mostly brownish, darker in the basal half.〔 The subspecies ''E. s. triglites'' of the Bergamo Alps and Monte Generoso is more strongly marked than the nominate subspecies ''E. s. styx''. It has a larger postdiscal band and larger eyespots on the upper forewing while the underside of the hindwing sometimes lacks eyespots.〔 The subspecies ''E. s. trentae'' of the Julian Alps is even more strongly marked. It has large eyespots with bright white centres.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Stygian ringlet」の詳細全文を読む スポンサード リンク
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