12. Probably Caltoris malaya.

Female from the abdominal end.
Plain brown.

Caltoris is very difficult.
Since it is female C. bromus & kumara can be eliminated as the female almost always have HW spot.
C. philippina have narrow pointed FW & C. cahira is very dark chocolate.

Since the size is small the likely candidate is C. malaya female.
https://4.bp.blogspot.com/-j1Pq5mDim...M_adult_06.jpg


TL Seow: Cheers.