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Parthenos sylvia apicalis
A large butterfly came flying from high in a tree, over my head, to land on the other side of the forest path. Of course she sat face-away :) I remember to be excited about the blue colour of the hind-wings. I know now it's female, due to the larger size (males -75mm) as this one was about 100mm wingspan. An uncommon species in Thailand.
Thanks to NuwanChathuranga for ID!