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Parnassius (Driopa) eversmanni thor Hy. Edwards, 1881

(zoological nomenclature: valid name, available)

General information:

Parnassius Thor Hy. Edwards, 1881: 2.
Type locality: "about 800 miles up the Yukon river, Alaska" (Edwards 1881)
Type: Holotype in coll. AMNH

Synonyms, misspellings, wrong determinations, etc.:
Parnassius eversmanni meridionalis Eisner, 1978: 109, pl. 2, figs. 9 D, 10 D (holotype). Type locality: "Pink Mt., B. C., 122° 30´ long., 57° lat." [British Columbia]. Primary homonym of Parnassius apollo meridionalis Pagenstecher, 1909: 187.
Parnassius eversmanni pinkensis Gauthier, 1984: 319. Replacement name for Parnassius eversmanni meridionalis/i> Eisner, 1978: 109.
Parnassius eversmanni race thor tr. f. kohlsaati Gunder, 1932: 123. Type locality: "McKinley National Park, Alaska” [Denali National Park]. Unavailable infrasubspecific name.

Habit:

Description: Wing expanse: apr. 53 mm. "Head, anterior portion of thorax above, and the whole of the lower side, base of the tibiae, and under side of abdomen thickly clothed with bright golden yellow hairs. There are also a few scales of the same color at the base of the costa of the primaries and along the sides of the abdominal segments. Antennae and tarsi jet black, the latter with some yellow hairs at their base. Upper side: Ground color sordid white, as in P. Clarius Evers., and P. Delphius Evers. Primaries with the posterior margins broadly smoky and slightly transparent. Above the margin is a row of equal lunate white marks, then a moderately broad blackish band, narrowing a little at the interior margin, then a whitish maculate band, broadest on the internal margin and reduced to a spot on the costa. Anterior to this is a sinuate row of white spots, six in number, not reaching the internal margin, which is whitish at the base, dotted with black atoms, as is also the costa. Base of the wing blackish, the cell with one large ovate, and one oblong white spot. The system of markings of the primaries recalls that of the genus Thais, and is different from any other Parnassius known to me. Secondaries: Base and anal margin broadly black, the markings being very clearly cut around the upper portion of the cell, leaving a well-defined ovate white space. From the anal angle up to the second sub-costal nervure runs a wide black band, enclosing at the anal angle one small round and one lunate red spot. Between the second sub-costal and the discoidal nervures is an almost conical red patch, and below it a small round spot, also red. On the centre of the costa is a triangular red spot, surrounded with black. The submarginal lunules are very sharp and distinct, as indeed are all the markings, and the fringes of both wings are deep, intense black. Under side: Resembling the upper, but the markings are a little fainter, and the wings have the glassy appearance so often found on the genus. The secondaries have four red spots at the base - the one on the costa small and almost linear, the second nearly square, the third triangular, and the fourth oblong. The other red spots have their centres white" (Edwards 1881).

Distribution:

Subspecies thor is found in Alaska and the Canadien provinces of Yukon, NW Territory and British Columbia (Warren et al. 2012). Vertically, records are available from near sea-level to 1300 m a.s.l. (Kurz & Kurz 2016).

Biology:

The imagines inhabit Tundra-like habitates. They are on the wing in one generation in June and July. Nectar uptake has been observed on Petasites frigidus (Warren et al. 2012, Kurz & Kurz 2016).

Stages in development:

Larva. The larva is black with yellow markings. It feeds on Corydalis pauciflora (Warren et al. 2012).

Worth knowing:

Sources:

Edwards H. On two new forms of the genus Parnassius. Papilio 1(1): 2-4.
Warren, A. D., K. J. Davis, N. V. Grishin, J. P. Pelham, E. M. Stangeland. 2012. Interactive Listing of American Butterflies. [30-XII-12] URL: http://www.butterfliesofamerica.com/ [online 2016.10.10].

Publication data:

history:
Kurz Michael: 2016.10.10
not reviewed

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