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Junonia goudotii
Nymphalidae, Nymphalinae, Junonia goudotii.
http://en.wikipedia.org/wiki/File:Boisdu...
http://www.boldsystems.org/index.php/Tax...
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_(but...)
See below for a similar continental butterfly in this genus:
http://www.learnaboutbutterflies.com/Afr...
I hope someone else can help further or has an alternative.