Frigga Fritillary (Boloria frigga [Thunberg])
Wing span: 1 1/2 - 2 inches (3.8 - 5.1 cm).
Identification: Tip of forewing pointed. Wings orange-brown with black markings; darker at wing bases. Underside of hindwing with off-white patch near base of costal margin.
Life history: Males patrol in low areas of willow bogs. Hibernation is by nearly full-grown caterpillars.
Flight: One brood from late May-early August.
Caterpillar hosts: Cranberry (Vaccinium) and bog rosemary (Rosmarinus), perhaps willow (Salix) and dwarf birch (Betula).
Adult food: Flower nectar.
Habitat: Sedge and sphagnum bogs, arctic tundra.
Range: Holarctic. Northern Alaska and northern Canada east to Labrador, south to northern areas of Michigan, Minnesota, and Wisconsin. Isolated populations in Rocky Mountains to Wyoming and southcentral Colorado.
