Inconspicuous when at rest, often settling on bare ground or stones with wings closed. It appears a large butterfly when in flight, when paler upperside wing markings become visible.
Wingspan 51 - 56mm (male), 54 - 62mm (female).
Ova laid singly, usually on grass blade, and hatch within around 17 days. Larvae feed at night, pupating in early June. The pupal stage lasts about 4 weeks, with adults emerging from early July.
July and August are best months.
This tends to be a coastal species inhabiting localised colonies, occurring in Moray, Highland, and the southernmost islands of the Western Isles.
Leverton, Roy (2005). Change. Highland Branch Newsletter 10.
Mainwood, Tony (2005). The Loch Fleet transect. Highland Branch Newsletter 10.