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The four-spotted chaser (''Libellula quadrimaculata''), known in North America as the four-spotted skimmer, is a dragonfly of the family Libellulidae found frequently throughout Europe, Asia, and North America. The adult stage is found between April to early September in the United Kingdom, and from mid-May to mid-August in Ireland. Larvae have a two year developmental cycle. Adults feed predominantly on mosquitoes, gnats and midges;〔http://www.shgresources.com/ak/symbols/insect/ Retrieved 16 Feb. 2010〕 the larvae feed primarily on other aquatic insect larvae and on tadpoles. There is a variant form, ''praenubila'' Newman, which has exaggerated wing spots. This is believed to be related to water temperatures during larval development, and appears to be more common in Europe than in the Americas. The four-spotted skimmer is the state insect of Alaska. Libellula quadrimaculata LC0270.jpg|Top-view, female Dragonfly macro.jpg Libellula quadrimaculata in flight-pjt3.jpg|In flight Libellula quadrimaculata.ogv|thumbtime=0:52|Hunting and returning to a favoured perch at a pond ==Habitat== This active dragonfly mainly lives by ponds, vernal pools, and slow flowing rivers; they are most common in June and July. 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「Four-spotted chaser」の詳細全文を読む スポンサード リンク
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