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The May highflyer ''(Hydriomena impluviata)'' is a moth of the family Geometridae. It is found across the Palearctic region and the Near East although its range is largely determined by the presence of its larval food plant. The wingspan is 30–34 mm and it is quite variable in markings, the best identification feature being four square spots along the costa of each forewing, although these may not be visible in the frequent melanic forms."individual specimens of ''coerulata'' (synonym of ''impluviata'') bear a very close resemblance to ''Hydriomena ruberata''. ''coerulata'' (''impluviata'') is perhaps on an average slightly smaller, is somewhat shorter-winged, oftener with a very pale, blue-green median band, the oblique subbasal line is straight, or only very weakly angulated in the cell, the black marks on the hindmargin of the forewing and on the anterior veins distally, which generally characterize both species, on an average less strongly developed than in ''ruberata'' but very variable in both species".〔Prout , L.B. 1912–16. Geometridae. In A. Seitz (ed.) ''The Macrolepidoptera of the World''. The Palaearctic Geometridae, 4. 479 pp. Alfred Kernen, Stuttgart. 〕 The species flies at night from May to July and is attracted to light. The larva feeds on the leaves of alder, spinning 2 leaves together so it can feed undisturbed. The species overwinters as a pupa under loose alder bark. #''The flight season refers to the British Isles. This may vary in other parts of the range.'' == Subspecies == *''H. i. impluviata'' *''H. i. insulicolata'' 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「May highflyer」の詳細全文を読む スポンサード リンク
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