In checking through various valid images of the two species here is another difference which is quite consistent.

In N. sanaya the HW orange ring is wider & bright orange.
http://yutaka.it-n.jp/lyc4/81220010.html

In N. subperusia, the orange ring is narrower, duller, & more ochreous.
http://yutaka.it-n.jp/lyc4/81210010.html

So this is definitely N. sanaya male.



TL Seow: Cheers.