Nationally scarce (Na) in open woodland and moorland in parts of north-western England, Scotland and southern Wales, and on the Burren in Co. Clare. Unlikely to be recorded in Hampshire or on the Isle of Wight. Wingspan 15-19 mm. This species is often confused with
N. schwarziellus; it may be distinguished from that species by its broader wings, darker colouring and by dissection of the genitalia (MBGBI Vol 1). Larva feeds on dead leaves of Bilberry, living within a movable case.