Very rare immigrant (less than 10 previous UK records) to the south coast of England from central Europe. One of unknown origin was recorded in the grounds of Buckingham Palace on 12 July 1995, and a genuine migrant at Dungeness, Kent on 14 September 2006, with no further records to date. Not recorded in Hampshire or on the Isle of Wight to date. Wingspan 16-18 mm. Distinctive nut-brown forewing and, in males, diagnostic indentation in costal edge of hindwing about one quarter along the wing, visible with a lens from below. No evidence of breeding in the UK.