The Parnassius species of butterflies are often hard to identify and can sometimes only be identified by dissection of the genitalia. P. R. Ackery (1975) provides a key available online.Ackery PR (1975) A guide to the genera and species of Parnassiinae (Lepidoptera:Papilionidae). Bulletin of the British Museum (Natural History) Entomology 31, 4 pdf will key to Parnassius delphius but it is smaller and has better defined markings. The discal band of forewing shortened, in exceptional cases running into the submarginal band. Hindwing with broad marginal band, in which there stand four or five darker spots, which are dusted with blue in the female; as a rule only one ocellus preserved, namely the posterior one, being sometimes reduced to a dot; moreover, often a red hindmarginal dot.
