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White-letter Hairstreak Satyriuim w-album Wingspan 35mm. Small, active butterfly that is hard to observe closely. Usually flies around treetops but also visits Bramble flowers to feed. Adult seldom reveals upperwings. Underwings are brown with jagged orange band and white ‘w’ on hindwing. Flies July-Aug. Larva is rather slug-like and feeds on elms. Widespread loss of larval foodplants from Dutch elm disease has caused decline. Today it is very local, in central and southern England and Wales.