Thanks Seow for the help. Hmm.. Caltoris bromus is not in Singapore checklist. I looked through my shots and found one with hindwing partially visible. Will this be useful? I rotated it CCW for better viewing and comparison.
I google on the net and found some pictures of Caltoris bromus (mainly from HK)
http://jjh.pbase.com/g6/90/2490/2/81720370.dfEPozyO.jpg
http://www.google.com.sg/imgres?q=Ca...67tGECQ&zoom=1
http://www.asiaa.sinica.edu.tw/~ynsu...SC_5316-1.html