Acanthopsyche atra, the dusky sweep, is a moth of the Psychidae family. It is found in most of Europe, except Portugal, most of the Balkan Peninsula, Ireland and Ukraine. The habitat consists of heathland and moorland. The wingspan is 16–22 mm for males. Female are wingless. Adults are on wing in May and June. The larvae feed on Gramineae species and Calluna vulgaris. They live in a silk case about 20 mm long which is covered with grass stems and heather fragments. The larval stage often lasts two years. The case is fixed on a wall, rock or fence prior to pupation.