What a beauty Stephen! It could be in the genus Precis; there are two species endemic to Madagascar, but little info I could find with what was just a quick search:
http://en.wikipedia.org/wiki/Precis_(butterfly)
See below for a similar continental butterfly in this genus:
http://www.learnaboutbutterflies.com/Africa%20-%20Precis%20limnoria.htm
I hope someone else can help further or has an alternative.
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