It is a female Nacaduba sanaya elioti
The submarginal spots are unusually large here.

Nacaduba sanaya.
Dark sriae within the bands poorly developed or absent; FW postdiscal band dislocated near upper end at vein 6.
HW submarginal band with rounded inner margins; HW black spot without any metallic blue scale.
Females.
http://2.bp.blogspot.com/-TbqxcQ50Sh...Line+Blue).jpg
http://www.butterflycircle.com/check...race%20tan.jpg
Males.
http://photobucket.com/gallery/user/...NTAyMjM=/?ref=
http://www.besgroup.org/wp-content/u...i-LenaChow.jpg

Also recorded in Singapore in the past.
Nacaduba hermus swatipa.
Dark striae within bands weak or absent (as in sanaya. );FW postdiscal band without dislocation.
HW submarginal spots with rounded inner margins (as in sanaya.); HW black spot marked with metallic scales.
Two males.
https://3.bp.blogspot.com/-oYUpNLP4n...0/DSC_2636.JPG
https://4.bp.blogspot.com/-EvYfAiVFY...0/DSC_1760.JPG

Very similar sometimes & easily confused.
Nacaduba pactolus.
Dark striae weak or absent ( as in sanaya ). FW postdiscal band without any dislocation; white striae may be fuzzy, diffuse, especially in the female.
HW submarginal spots with straight ('flat') inner margins, spot 6 quadrate or rectangular ; HW black spots strongly streaked with metallic blue scales.
Male & female.
https://c2.staticflickr.com/2/1104/1...51d8e5a3e9.jpg
http://www.butterflycircle.com/check...0-%20Sunny.jpg


TL Seow : Cheers.