Field guide · Norway
Skippers · Norway

Large grizzled skipper

Pyrgus alveus

Large grizzled skipper is a dark moth with small, distinct white spots on its forewing and a sharply cut white spot on the underside of its hindwing. It is declining in Norway and is now stable in the inner layers of Eastern Norway, in the inner areas of Vestlandet, and from Jotunheimen to southern Dovre. It flies from the end of May to the middle of July.

Status in this countryThreatened in NorwayEN (Endangered)
Large grizzled skipper
Photo: (c) Andrejus Gaidamavičius, some rights reserved (CC BY) · CC BY 4.0

Flight period

From the end of May to the middle of July.

Habitat

Sunlit plants and rocky slopes with rich vegetation of herbs. In Jotunheimen, it exists above the tree line, up to approximately 1200 m on the southern slopes.

Identifying features

Wingspan 26–29 mm. The wings’ base colour is dark brown-grey. The forewing’s white spots are small, but clear, while the hindwing has only faint indications of light markings. The large white spot in the center of the underside of the hindwing is sharply cut off inwards.

Similar species

Differentiates from Northern grizzled skipper and Grizzled skipper by lacking white spots on the upper side of the hindwing. This characteristic is shared with Alpine Grizzled Skipper, but in that one, the white spot on the underside of the hindwing is extended towards the wing base on the upper side, and the distribution areas of the two species do not overlap.

Distribution

The species is declining in Norway. It has almost disappeared from Southern Norway and the lowlands of Eastern Norway, but persists in the inner areas of Eastern Norway, the inner parts of Vestlandet, and from Jotunheimen to the southern parts of Dovre.

Biology

The larvae’s host plants in Northern Europe are unknown, but may possibly be dog roses (Potentilla) and blue beard (Polygala).