Dr Seow, Aaron, thanks for your views on this one. I continue to learn.

The feature of fw basal spot missing is unhelpful in my limited opinion. Even the holotype of A. avathina clearly shows fw sub-basal spots - and if the characteristic truly was regarding the basal spot, which is sometimes discernable in very pristine examples of muta, kurzi etc, it is often too faint to use as a distinguishing feature.

I would be hesitant to id this one as A. kurzi.

It now becomes clear that even in A. kurzi, the sub-marginal spots are rather dark and defined. From all valid A. kurzi specimens that I've seen, however, the forewing band is distinctively broken at each vein for spots 4, 5 and 6. These are specimens with upperside confirmation.

A. avathina, in the holotype from Singapore, displays fw post-discal spots very well aligned. This is also seen in CJ's shot (post 9).

Dr Seow, your point of separating these 2 species by upperside is definitely the most solid method. They prove to be very similar on the underside.