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Heliconius ethilla narcaea
Bayucca and Karen: thank you for the ID (sorry Karen, I agree with Bayucca).
East end, Seema, Alika, Chilli garden and Gerardo, thank you for the comments.
Nymphalidae, Heliconius sp., Heliconius ethilla narcaea. Mechanitis would have some red behind the head.
Beautiful longwing butterfly! I can't remember which offhand but I will look it up later if no-one ID's it first!