Nationally scarce (Na) in birch woodland and moorland in parts of the Scottish Highlands, previously also in England, where last recorded in Worcestershire in 1970. No recent record and presumed long extinct in Hampshire. Not recorded from the Isle of Wight to date. Wingspan male 45-65 mm, female 69-90 mm. Unmistakable. Larva feeds on Silver Birch, over-wintering as a pupa.