At the moment I am uncertain as to whether it is possible to separate pura from celeno from just the underside.
I really was hoping someone will show an upperside no matter how blur it is , especially if it is a male. Just the edge of the outer magin(termen) will do.
The female is much harder without looking at the upper part of the hindwing above.
I think the alignment of hndwing striae is still very important if present for pura. Both the Palawan race (on Asahi website) & the Bruneian race shows good alignment.
Les, your 1st is a female & could be pura & the other two are males & looks like celeno, but I cant be sure.
The rest, all females could be pura because of darker spots & broader white striae.