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Dusky-winged Fritillary

Boloria improba

  • Name also: Dingy Fritillary, Ding Arctic Fritillary (USA)
  • Family: Brushfooted Butterflies (Four-footed Butterflies) – Nymphalidae
  • Subfamily: Heliconians (Longwings) – Heliconiinae
  • Wing span: Small, 29–36 mm (1.13–1.4 in.). Females slightly larger than males.
  • Wing upper side: Dark brownish orange, violet, black blotches and spots.
  • Wing underside: Brownish orange, black blotches and spots. Basal part of hind wings rust-red. Yellowish lateral band with central and uppermost blotch lighter than others. Outer part brownish orange, unclear round spots.
  • Habitat: Tundra.
  • Flying time: Around mid-July.
  • Overwintering form: Caterpillar (overwinters as a caterpillar 2 seasons).
  • Larval foodplant: Apparently dwarf willow (Salix herbacea), net-leaved willow (S. reticulata) and alpine bistort (Bistorta vivipara).
  • Endangerment: Extremely endangered, protected in all of Finland.

The dusky-winged fritillary can only be found in Finland very rarely, at the tip of Finland’s north-western “arm” in Arctic conditions 600–1000 metres high. The butterfly’s flying time is very short, only several days, although it spends a couple of seasons as a caterpillar. Males fly around very low down in their search for females, which lay their eggs in lichen and the branches of the host plant in a number of different places.

The dusky-winged fritillary can be identified from the dark upper side of its wing, and the eye-catchingly paler blotches on the middle part and upper edge of the central belt on the hind wings.

Other species from the same genus
Other species from the same group

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