Identifying features
Wingspan 27–29 mm. The wings’ base colour is dark brown. The forewing has clear white spots, while the hindwing has only a hint of light, grey shadows. The large white spot in the middle of the underside of the hindwing is extended towards the wing base on top.
Similar species
The elongated white spot on the underside of the hindwing, combined with the fact that the upper side of the hindwing lacks clear spots, distinguishes it from the other three Norwegian species in the genus Pyrgus.
Distribution
Commonly found in the mountain regions of Nordland, Troms, and Finnmark; extending as far north as sea level. Also found in the mountain region of Southern Norway, including in Dovre (described from there in the 1800s) and in 1990 in Eidfjord in Vestland.
Biology
The larval host plant or plants in the Nordic countries are unknown, but mountain avens is likely.