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''Colias croceus'' is a small butterfly of the Pieridae family, that is, the Yellows and Whites. In India and nearby regions it is known as the Dark Clouded Yellow or Common Clouded Yellow to distinguish it from the other species of clouded yellows occurring there; elsewhere it is often simply known as the clouded yellow, as it was the first and original butterfly to go by this name. ==Description== The upperside is golden to orange yellow with a broad black margin on all four wings and a black spot near the centre forewing. The underside lacks the black borders and is lighter, with a more greenish tint, particularly on the forewings. In the forewing underside is the same dark spot as on the upperside, but often with a light centre; the hindwing underside has a white centre spot, often with a smaller white or dark dot immediately above it. Sometimes, a row of black dots occurs on the underwings' outer margins, corresponding to where the black border ends on the upperside, Females differ from the males in having yellow spots along the black borders on the upperside. In a small proportion of females the golden upperside colouration is replaced by a pale cream colour. These have been distinguished as form ''helice'', but do not seem to be that distinct as intermediates exist and the variation is to some extent related to humidity during development, with dryer conditions producing paler colouration. In flight, it is easily identifiable by the intense yellow colouring, much brighter than that of the lemon-yellow male Common Brimstone which also lacks black colour. Like all ''Colias'' species they never open their wings at rest. Pale females can be confused with the rarer Pale Clouded Yellow (''C. hyale'') and Berger's Clouded Yellow (''C. sareptensis''). Even the palest ''C. croceus'' tends to have more black on the upperside however, in particular on the hindwings. Image:Colias.croceus.mounted.jpg|Male dorsal side Image:Colias croceus.forma helice.jpg|Female form ''helice'' Image:Colias croceus plate.jpg|Male (top) and female (bottom) Image:0 Souci (♀) - Colias croceus - Boussu-lez-Walcourt (1a).JPG|on ''Trifolium pratense'' 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「Colias croceus」の詳細全文を読む スポンサード リンク
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