Local in woodland margins and hedgerows throughout much of south-eastern England, north to Yorkshire. In Hampshire most frequent in the south-east of the county, with scattered records elsewhere and on the Isle of Wight. Wingspan 10-13.5 mm. The main confusion species are C. milvipennis and C. alnifoliae, which have the antenna unringed at the apex, and C. badiipennella, which is smaller. Larva mines leaves of Elm, living within a movable case, and over-wintering twice; case length 9-11.5 mm.

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