Common barred sailor

There are three species of Neptis confirmed from Swaziland (N. laeta, Common barred sailor; N. saclava marpessa, Spotted sailor, and N. serena serena, Serene sailor). There are others which might also be found in the area, the Streaked sailor (N. goochii) and Pennington's sailor (N. penningtoni), but these are yet to be confirmed. The common barred sailor seems to occur fairly frequently within Mlawula. The colour variation in your photo might be refraction of light on the wings - they sometimes appear very irridescent: http://www.sntc.org.sz/biodiversity/sdbutterflyphotos.asp?pid=2051&spid=658

I just learned about the toughness of these Neptis! I thought it could be possible to get down to species level, but after a profound search, I am no more so sure. I think you would need the native specimen and a real expert in Neptis. My first guess would have been Neptis alta: http://abdb-africa.org/repository/repoPrev/Neptis%20alta%20UPS%20Wli%20Ghana%202010.11.29_s.jpg But after looking at these ones, forget it... http://rcdening.co.uk/rcdening_collectn/butter_flies/highres_images/Case%2036A.jpg Or that one: http://rcdening.co.uk/rcdening_collectn/butter_flies/images/neptis2.jpg This is also frustrating: http://www.archive.org/stream/transactionsofen1921roya#page/587/mode/1up Not really better: http://be.convdocs.org/docs/index-91702.html?page=13