I thought the Singapore Biodiversity site have only the upperside image in my search.

With a proper underside this doesn't match.

C&P4 states in A. avathina the postdiscal band is completely dislocated at vein 2, not dislocated widely as here.
The green metalmark is large & elongate & also does not match.

The closest it come to is A. hypomuta.
https://en.wikipedia.org/wiki/Arhopa...taFUpUnAC1.jpg


TL Seow: Cheers.