Boloria improba

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Dingy Fritillary
Boloria improba - Nature Conservation-001-073-g027.jpg
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Nymphalidae
Genus: Boloria
Species: B. improba
Binomial name
Boloria improba
Butler, 1877

The Dingy Fritillary (Boloria improba) is a butterfly of the Nymphalidae family. In Europe it is only found in small parts of Scandinavia, more specifically the border region between Norway, Sweden and Finland. The species is also present in North America in the North-Eastern part of Alaska and some isolated populations in the Canadian part of the Rocky Mountains, South-Western Wyoming and South-Western Colorado. In Russia it is present in the North-East (the Chukotka region).

The wingspan is 28–34 mm. The butterfly flies from June to August depending on the location.

The larvae probably feed on Polygonum viviparum in Europe. In North America the food plants are Salix arctica and Salix reticulata nivalis.


The following subspecies are recognised:

  • Boloria improba acrocnema in the San Juan Mountains in southwestern Colorado
  • Boloria improba harryi in the Wind River Mountains in southwestern Wyoming
  • Boloria improba improba in Alaska and northwestern Canada. The Siberian variant which is more yellow are considered the same subspecies, they are called forma youngi.
  • Boloria improba improbula Northern Scandinavia

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