Nacaduba berenice?

[Psyche]

It is highly probable that Prosotas pia pia occur in Singapore.


Here is another male from Singapore.
On the HW the dark marginal line angled out in a 'V' at vein 2 (just below the black spot) indicating where the tail is broken off.
The submarginal & marginal spots are much faded.
https://inaturalist-open-data.s3.ama...jpg?1631959024


Both your male & this male have the black markings much reduced, so this is not a one off aberration.
Both are very similar to this male from Brunei.
https://species.wikimedia.org/wiki/P...iaMUpUnAC1.jpg


In contrast P. nora male have the black markings strongly developed giving it a different look.
http://www.butterflycircle.com/check...erry%20Ong.jpg


Probable female Prosotas pia, Singapore.
https://inaturalist-open-data.s3.ama...jpg?1613368451

TL Seow: Cheers.