ID Correction.
It is Arhopala major.

In Malaya & Singapore the male amphimuta have very narrow border topside, which allow the blue to show at the edge.
A combination of both features 1 & 2 is needed to ID A. amphimuta ie HW spot 1b strongly V-shaped + HW discal & postdiscal spots in space 7 about equal.

Arhopala amphimuta.
http://4.bp.blogspot.com/-J9Xmngyim6...+amphimuta.jpg
http://www.google.com/imgres?imgurl=...&iact=c&ictx=1

A. major.
ID feature one; either HW discal spot small ie about half that of the postdiscal spot or HW spot 1b flattened ,like a J or L.

http://4.bp.blogspot.com/-swQUzv8TA7..._female_01.jpg