From what I can see of the markings, the species is distinctive enough to confirm the ID as N. augusta kerriana. Well done!
Haven't seen this before, so I wonder where this species has been hiding all this while? Keep hunting in that location. If they're mating, means they're breeding somewhere there...
Anyway, it's a +1 for Singapore, and we're pushing towards 290 with everyone's help!
What the XXX are you doing in Singapore. Firstly Vanessa indica and now N. angusta kerriana, which, incedentally, it most definitely is. I come across it often up here.
Will you please stop finding species which I thought were my specials!!!! STOP IT, STOP IT, STOP IT, you are making me look bad!!! Why is there not a Smiley of a baby throwing his toys out of a pram? Whatever, congratulations again!
If you see the female, the upperside hindwing markings are unmistakable.