This is not an aberrant
I. helicon as I thought. It is a Prosotas male species.
The postdiscal band is as for
P. gracilis or bhutea.
P. gracilis have a sharply defined black base on the forewing and lack the spot (in space 1b) below the central cellspot.
It has a postdiscal spot in space 1b as seen in your example of
gracilis in the post 12.
P. bhutea lacks the spot below the central cellspot but also do not have a postdiscal spot in space 1b.
It usually have darkened wingbase (? always)
http://www.neutron.phys.ethz.ch/Lepi...04%20(2)-1.JPG
It can not be
P. pia pia in which the postdiscal spots are not rounded (similar to
nora).
http://upload.wikimedia.org/wikipedi...iaMUpUnAC1.jpg
P. pia marginata from Thailand.
http://species.wikimedia.org/wiki/Fi...taMUpUnAC1.jpg
It looks like it is
Prosotas bhutea, but the confirmatory lack of spots in space 1b of the forewing is hidden.
No other match.
(Note C&P4 does not mention
P. bhutea has dark bases .)
TL Seow