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Pieris napi
The Green-veined White (Pieris napi) is a butterfly of the Pieridae family.
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.
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 the Large and Small Whites two, it rarely chooses garden cabbages to lay its eggs on, preferring wild crucifers.
Same family and same subfamily as Pieris napi, but yours is in my eyes Appias olferna, Eastern Striped Albatross. Please, verify!
http://www.learnaboutbutterflies.com/Ind...
http://yutaka.it-n.jp/pie/20220001.html
The one from Singapore is obviously considered as a subspecies of Appias libythea as Appias Libythea olferna.
http://www.butterflycircle.com/checklist...