Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

Frigga Fritillary
Boloria frigga (Thunberg, 1791)

Family: Nymphalidae
Subfamily: Heliconiinae
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.
Wing Span: 1 1/2 - 2 inches (3.8 - 5.1 cm).
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 (Andromeda), 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.
Conservation: Not usually of concern, but isolated populations may be of interest at the state or local level.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management Needs: Maintain integrity of bog habitat.
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