Endangered (proposed as a future Red Data Book species) in parts of England and Wales. Not recorded in Hampshire or on the Isle of Wight to date. Wingspan male 18-25 mm, female wingless. The adult moths are seen occasionally, but most records are of larval cases. Larva feeds on various grasses, Oak, Hawthorn, Birch and Heather, living within a movable case, over-wintering twice.