Which Nacaduba please?

[Psyche]

This one of the tricky one.
Upper right -male ;lower left -female.
As you can see the dark lines within the bands are strongly developed ruling out N. beroe
The male N. beroe has the dark lines disintergrating or obsolete.
https://wanderingbutterflyeffect.fil...f39fce860b.jpg

They can only be N. calauria or berenice.

My guess is they are N. calauria.
This is because the submarginal spots are sharply pointed.

Unfortunately the range of variation of N. calauria is largely unknown.
The typical form has a straight FW postdiscal band ,& sharply pointed spots 4 & 5 on the FW ; likewise on the HW.
Typical male N. calauria .Note darkish violet upperside.
Males
https://wanderingbutterflyeffect.fil...b3ad98860e.jpg
http://farm6.static.flickr.com/5788/...c204e4f1_b.jpg
Female.
http://www.butterflycircle.com/check...yica---2--.jpg

However, the FW postdiscal band may be partially broken as in these examples.
https://species.wikimedia.org/wiki/F...caMUpUnAC1.jpg
https://nl.wikipedia.org/wiki/Bestan...iaMUpUnAC1.jpg

They are also examples of N. berenice with a straight band.
Thus a straight band alone is not diagnostic of N. calauria.
Conversely a slightly dislocated or angulated FW band does not rule out N. calauria.

Horace have bred a large numbers of N. berenice, male & female & none has the submarginal spots so sharp.
Two examples of the female forms of N. berenice.
http://smg.photobucket.com/user/fede...eBlue.jpg.html
http://s22.photobucket.com/user/digi...uduba.jpg.html

Male N. berenice.
http://www.butterflycircle.com/check...hee%20Beng.jpg
http://1.bp.blogspot.com/-Zu44RwI3RD...a+berenice.jpg

Tl Seow : Cheers.