Parnassius imperator

Subspecies P. i. augustus was described by Hans Fruhstorfer in the 1907 book The Fauna of British India, Including Ceylon and Burma – Butterflies, Volume II:

♂ ♀. Upperside: creamy-white. Fore wing: costa and base closely irrorated with black scales; the usual short transverse medial and apical black bars across the cell, followed by irregularly sinuous, broad, transverse, dusky-black discal and postdiscal, complete bands that extend from the costa to the dorsum; the discal band very broad, below the apex of cell bent inwards and almost completely filling the base of interspaces 2 and 3; the terminal margin broadly dusky hyaline black. Hind wing: the dorsal margin up to the subcostal vein and downwards to a little above the tornus densely irrorated with black scales and with scattered long white hairs; an upper basal black-encircled crimson spot; another in the middle of interspace 7 and a third in interspace 5, the latter two centred with white ; beyond there is an irregular, sinuous, postdiscal dusky-black transverse band from costa to vein 4, posterior to which in interspaces 2 and 3 are two prominent round black subtornal spots, broadly centred with blue; lastly, the terminal margin narrowly dusky black. …

“North-eastern India (Sikkim), western China (Xizang Zizhiqu (Tibet), Qinghai, Gansu, Sichuan (Szechwan) and Yunnan).” One early siting in Tibet was by Antwerp Edgar Pratt, "... I returned to Ta-tsien-lu... I found time to search for the larvae of Parnassius Imperator and got about twenty, and one pupa"