I kind of forgot that P. mathias is also found in Africa since my reference book did not mention it.
In fact both P. thrax & mathias are found widely in Subsaharan Africa. http://www.metamorphosis.org.za/arti...s%20Walker.pdf
As there is no example of P. thrax with whitish shading through out the Mediterranean & the Middle East, this means the examples with white marginal shading on the wings are mis-ID'ed P. mathias.
eg.http://tolweb.org/Pelopidas_thrax
The three species can now be separated with greater confidence.
P. mathias ; Un with paler whitish shadings in the marginal areas ; spots may have dark margins ;UpF male brand dark.
P. agna .UnH uniform brown, ochreous, spots without dark margins; UpF male brand dark
P. thrax; UnH uniform light brown ;spots with dark margins, some spots may be reduced to dark rings/dots; UpF male brand whitish, upper cellspot elongate .