I'm not sure if my dad posted this on the forums before for discussion.
In 2005 when I was on duty at SAFTI, I saw a female Appias paulina distanti that was trapped in the building. The specimen was very fresh, so I figured it was unlikely to have been blown in from Johor.
I, personally, have great difficulty in telling apart the wet season female form of Appias albina albina from Appias paulina distanti in the field. Whichever, it would be a very interesting discovery. No photo?
You do seem to be quite badly represented by that genus down there!