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Pieris napi japonica
The Green-veined White (Pieris napi) is a butterfly of the Pieridae family. A circumboreal species widespread across Europe and Asia, including the Indian subcontinent, Japan and the Maghreb and North America (Many authors consider the Mustard White of North America to be conspecific with napi or consider napi to be a superspecies). Like other "white" butterflies, the sexes differ. The female has two spots on each forewing, the male only one. The veins on wings of the female are usually more heavily marked. The underside hindwings are pale yellow with the veins highlighted by black scales giving a greenish tint, hence Green-veined White. Unlike these two butterflies it rarely chooses garden cabbages to lay its eggs on, preferring wild crucifers.
Pieris napi is found in damp, grassy places with some shade, forest edges, hedgerows, meadows and wooded river valleys. It is found in meadows, hedgerows and woodland glades but not as often in gardens and parks like its close relatives the Large and Small Whites, for which it is often mistaken.
Sorry for the bad photo, this butterfly was a long way away, but it was the only species of butterfly I saw in this area, and then I only saw a handful, and mostly they didn't settle anywhere. Hope there is enough here for an ID.