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The Common or Clouded Sulphur (''Colias philodice'') is a North American butterfly in the family Pieridae, subfamily Coliadinae. == Description == This species is a typical member of the genus. Both genders typically have pale yellow wings above with no traces of orange, unlike its close cousin the Orange Sulphur which may also be yellowish. Males have clean borders, while females have yellow dots within this region. Females sometimes exhibit a white form known as ''alba''. The underside of the male's wings is yellow while the female's is yellow or greenish-white, and both have a doubled hind wing spot trimmed in brownish-red. The hindwings show a series of 4 small red spots along the outer third portion, a trait that distinguishes the other North America species such as ''Colias interior'', with exception of the orange sulphur which also shows them. Its wingspan 32 to 54 mm.〔http://www.cbif.gc.ca/spp_pages/butterflies/species/CloudedSulphur_e.php〕 ; Form ''alba'' This species has white form ''alba'' which can be very common in some populations, while rare in others. It can be confused with other white form ''Colias'' particularly that of ''Colias eurytheme''. It can often be told by the border pattern of both wings, though some individuals are impossible to separate without the presence of other "normal" specimens. Though they differ in flight style, white form ''Colias'' may be confused with other Pierids such as ''Pieris rapae'' and ''Pontia protodice''. 〔http://bugguide.net/node/view/12864〕 White form males are also known, but they are exceedingly rare in this species. 〔http://bugguide.net/node/view/503074〕 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 philodice」の詳細全文を読む スポンサード リンク
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