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Purple Hairstreak - Neozephyrus quercus = Favonius quercus. Male (top) - female (centre and bottom (underside)). Wingspan 38mm. A rather enigmatic butterfly that can be hard to observe closely. As an adult it usually remains close to the top of the mature tree where its life-cycle began. Lives in colonies. Adults have brown upperwings; males have purple sheen on both wings, in females it is restricted to hindwings. Underwings are grey with hairstreak line. Larva is brown and rather slug-like; feeds on oak buds. Widespread but locally common only in southern England and Wales.