A small dark brown butterfly, with a swift flight (click on link below for image).
Wingspan 28 - 36mm (male), 28 - 38mm (female).
Single brooded. Ova laid singly on mat-grass, hatching within 12 - 18 days. Overwinters as larvae, emerging again in March, and becoming fully grown by late May or early June. Pupal stage lasts 18 - 22 days.
From late June to early August.
Found in Lochaber in the west, and in Badenoch and Strathspey towards the border with Perthshire.