Boloria improba, the dingy fritillary, is a butterfly of the family Nymphalidae. 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 northeastern part of Alaska and some isolated populations in the Canadian part of the Rocky Mountains, southwestern Wyoming and southwestern Colorado. In Russia it is present in the northeast (the Chukotka region).
The wingspan is 28–34 mm. The butterfly flies from June to August depending on the location.
The following subspecies are recognized:
- B. i. acrocnema in the San Juan Mountains in southwestern Colorado
- B. i. harryi in the Wind River Mountains in southwestern Wyoming
- B. i. improba in Alaska and northwestern Canada. The Siberian variant which is more yellow are considered the same subspecies, they are called form youngi.
- B. i. improbula northern Scandinavia
- Butterflies and Moths of North America
- Butterflies of Canada
- Butterflies of Norway
- Butterflies of Europe
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