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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.
Forest
Thanks to NuwanChathuranga for ID!
Excellent Nuwan, I had in mind it was not a moth but....
I find it in my large butterfly guide of Thailand and the images are even better than on wikipedia, although with the number of ssp it's hard to tell.
It is ssp apicalis, first because of the size (ssp lilacinus is smaller) and because ssp liliacinus is only found on the Thai peninsula plus Malaysia, whereas ssp apicalis is found throughout Thailand, be it an uncommon species.
Thank you very much, very fast solution and ID, great!