(Hübner, 1803)
Thor's Fritillar
Description:
In the Alps, Thor's Fritillary can be found in flower-rich places, in clearings, or in sheltered "alcoves" at the edges of woods. It prefers damp, north-facing slopes, and is often found beside streams or in ravines. In the Scandinavian part of its range, the butterflies can be seen in clearings in birch woods and coniferous forests, and near mountain lakes, swampy places, in gullies, and river beds. The Yellow Wood Violet (Viola biflora) is its major food plant, but other violets are used as well.
The female lays her eggs either on the food plant, or on a neighbouring plant, and the caterpillars take nearly two years to develop.
Habitat:
Alpine grasslands
Fens
Humid grasslands
Similar species:
Boloria euphrosyne
Boloria selene