Wingspan c.13 mm.
A rather scarce and local species occurring in a few south-eastern counties of England and in Ireland, where it is most frequent on the Burren. It is a relatively new species to the British list with the first confirmed occurrence from Hampshire in 1976.
The larvae feed during August and September between two spun leaves of birch (Betula, hazel (Corylus) or sweet chestnut (Castanea sativa).
Adults are on the wing in May and June and may be attracted to light.