Final coorection : Female Borbo cinnara.

Looks like your suggestion was right from the start, Sunny.

The female just do not look like P. mathias, from the shape & coarsely-stippled colouration.

A comparison shows the side of the abdomen is brown, same colour as the hindwing ground colour in the female B. cinnara.
http://www.butterflycircle.com/check...rwin%20Sum.jpg

In the P. mathias female the side of the abdomen is dark grey which is different from the hindwing ground colour.
http://2.bp.blogspot.com/_0EK80AsaR7...2-SB-Swift.jpg
Also seen in the female in the checklist.

The green tinge & hair of B. cinnara are less strong in the female & less obvious when worn & in photos.
I noticed the post 1 pic actually shows some greenish tinge.

It would seem the best ID guide on the underside is hindwing no cellspot and the three main spots in space 2 , 3, & 6. Seeing a green tinge is a bonus.
Another female with 4 spots
http://farm4.static.flickr.com/3119/...e0d03b1f97.jpg

TL Seow