Reserching a bit last night, I stumbled over this 2016 publication:
NEW INSIGHTS INTO THE SYSTEMATICS OF THE GENUS POLYURA BILLBERG, 1820 (NYMPHALIDAE, CHARAXINAE) WITH AN EMPHASIS ON THE P. ATHAMAS GROUP | Journal of the Lepidopterist's Society. 70 (2), 2016, 145-152
ABSTRACT. The genus Polyura comprises 32 species across the Oriental Region and the Indo-Australian archipelago. Its taxonomy and systematics have recently been studied using a comprehensive molecular phylogeny. Yet, certain elements of its fauna were not available for in depth study. Here, we provide a denser taxon sampling and reconstruct a new phylogenetic hypothesis for the P. athamas group, a morphologically cryptic complex. The known geographic range of the genus is extended to Eastern Pakistan where two species fly in sympatry. Endemics from Tawi Tawi archipelago off the northern tip of Borneo have more affinities with the fauna of Sunda Islands rather than with the Philippines. Our results also suggest three taxonomic changes; the recognition of a new species and the transfer of two subspecies to a different species.
I checked the Polyura featured in my thread Pakistan butterflies collection at NHM, Copenhagen and with the new book "The butterflies of Pakistan" in hand, it seem that the Pakistan specimen fit within Polyura agraria, rather than within "P. athamas". I have to check the underside of that specimen next time I visit the NHM Copenhagen, as I only have a picture of the upperside available, though I have a good feel about it being P. agraria already. Just goes to show how important collecting and keeping a collection is even these modern days! Collecting should never go out of fashion!