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''Lestes dryas'' is a species of damselfly which is found across Europe, Asia and North America. In North America it is known as the emerald spreadwing and this name is becoming more widely used in Europe. In Britain, it is very rare so its common name is the scarce emerald damselfly. An alternate name in Ireland is the turlough spreadwing. ''L. dryas'' can tolerate extreme conditions that few other dragonflies can survive. == Identification == Like the other members of the ''Lestes'' genus both sexes of ''L. dryas'' have largely metallic green bodies with a bronze iridescence. They usually rest with their wings half spread. ''L.dryas'' is very similar in appearance to the emerald damselfly ''L. sponsa'' and care must be taken to tell the two species apart. The male has blue eyes. Powder blue pruinescence develops on the front and end of the abdomen, the pronotum and the sides of the thorax. However all ''Lestes'' are very similar in appearance and it is the shape and colour of the anal appendage that is characteristic. The anal appendages in ''L. dryas'' and ''L. sponsa'' are black whilst in the other European ''Lestes'' they are white or light coloured. ''L. dryas'' and ''L. sponsa'' have slightly different shaped appendages as show in the photographs. The female has a more robust abdomen than the male. She has no blue colouration on her body and has brown eyes. Females have beige underparts. 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「Lestes dryas」の詳細全文を読む スポンサード リンク
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