|Specimen from Japan|
Parnassius eversmanni, or Eversmann's parnassian, is a high-altitude butterfly which is found in eastern Russia, Mongolia, Japan and Alaska. It is a member of the snow Apollo genus (Parnassius) of the swallowtail (Papilionidae) family. The species was named to honour Eduard Friedrich Eversmann.
Note: The wing pattern in Parnassius species is inconsistent and the very many subspecies and forms make identification problematic and uncertain. Structural characters derived from the genitalia, wing venation, sphragis and foretibial epiphysis are more, but not entirely reliable. The description given here is a guide only. For an identification key see Ackery P.R. (1975).
Ground-colour yellow in male yellow or yellowish white in female. Resembles in pattern very closely the female of Parnassius felderi: forewing grey at base and costal margin, and greyish glossy at distal margin; beyond the cell a curved discal band shaded with grey and a similar, sometimes less distinct, submarginal one. Abdominal area of hindwing dusted with black; a spot at anal angle, occasionally (especially often in female) prolonged to a short band; a more or less distinct undulate submarginal band; further, two red ocelli, the posterior one sometimes being all black on upperside or being wanting, remaining however distinct below; base of hindwing above spotted with red. Head and body yellow haired. 
The larva feeds on the Corydalis species C. gigantea, C. pauciflora, C. arctica, C. paeoniiholia, C. gorodkovi and C. pauciflora.
- Ackery P.R. (1975) A guide to the genera and species of Parnassiinae (Lepidoptera:Papilionidae). Bull. Br. Mus. nat. Hist. (Ent.) 31, 4 pdf
- Stichel in Seitz, 1906 (Parnassius). Die Groß-Schmetterlinge der Erde. Die Groß-Schmetterlinge des palaearktischen Faunengebietes. Die palaearktischen Tagfalter, Stuttgart.
- sv:Parnassius eversmanni Swedish Wikipedia provides further references and synonymy
- P. eversmanni images at Consortium for the Barcode of Life
- Parnassius eversmanni images at Encyclopedia of Life
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