 The wingspan is 24–32 mm for males and 24–34 mm for females.In these small butterflies (although unusually large for their family) the males have a mainly blue violet upper face of the wings with the brown edges, while the females have only a small amount of blue colour in the centre of the wings (sexual dimorphism).Both sexes have a thin, long tail in the hindwings and two black spots in the anal angle.