Boloria Improba

''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. Seitz ''improba'' Btlr., one of the Lepidoptera which go farthest north, from Nova Semblia, is smaller and above darker than ''frigga'' on the hindwing beneath the median band is somewhat less bright yellow and the rhomb before the middle of the costa is vivid bluish white. It is found in alpine or tundra habitats.

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

Subspecies

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

(MHNT) Boloria improba improbula - Suède Norrbotten Mts Nuolja - male dorsal.jpg, ''Boloria improba improbula'' ♂
(MHNT) Boloria improba improbula - Suède Norrbotten Mts Nuolja - male ventral.jpg, ''Boloria improba improbula'' ♂ △

References

External links

Butterflies and Moths of North AmericaButterflies of CanadaButterflies of Europe

Boloria
Butterflies of Europe
Butterflies of Asia
Butterflies of North America
Butterflies described in 1877

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