Great capture of the mating pair.
There are two features which make me a bit doubtful about the ID.
1. The post-discal band seems to be a little too straight for N. sanaya.
2. All the N. sanaya specimens I bred from various sites are consistent in that the usual bluish scales are absent in the black tornal spot on the hindwing. In the pic, both sexes clearly have these bluish scales.
Horace
Thanks Horace for the input !
It is a mating pair of N. pactolus.
An easy way to ID this species is to look at the HW submarginal spot 6.
It is large , squarish or rectangular with a sharp 'drop' to the rest of the flatter spots.
TL Seow :Cheers.
Thank you Dr. Seow !
Cheers!