It is male J. alecto which is much the commoner of the two.
The thicker white striae are in the lower half of the FW making it difficult to see sometimes.
Male & female J. alecto.
http://www.butterflycircle.com/check...0-%20Sunny.jpg
https://farm1.static.flickr.com/723/...ca47b247_b.jpgCorrection ;wrong image female celeno.
Corrected image female alecto.
http://www.butterflycircle.com/check...0-%20henry.jpg
Male & female J. elpis.
http://www.ifoundbutterflies.org/med...ekar_ag624.jpg
http://www.butterflycircle.com/check...obby%20Mun.jpg
TL Seow: Cheers.