Local in woodland and on moorland throughout much of England and Wales, and on moorland between 650 m and 950 m in northern Scotland. In Hampshire it is recorded occasionally in the New Forest and from one or two places in north Hampshire. On the Isle of Wight, there is one record at Newtown in 1975. Wingspan 15-18 mm. In size and general appearance this species is reminiscent of
Endothenia gentianaeana, but differs in the generally darker blue-black coloration of the forewing and the smaller and comparatively inconspicuous marking on the submedian fold [Bradley]. Larva feeds on Bilberry, living between shoots spun together with silk.