They do look like good species to me, but I guess the male genitalia is identical in all three taxa.
This brings me to a burning question. How sure are they the forms of
Papilio paradoxa (should be
paradoxus -male gender) are not two different species.
After all, the males of Appias nero, paulina & albina have identical male genintalia but nobody in his right mind would consider them the same species.
TL Seow
