Male upperside dull black, paler on the fore than on the hind wing. Fore wing with very conspicuous pale streaks, two in each interspace that extend well into the cell, but do not reach the termen, where the dull black ground-colour forms a broadish transverse band. Hind wing black, with in fresh specimens in certain lights a beautiful blue gloss; a central large white area composed of a white patch in the apical two-thirds of the cell and more or less elongate spots of varying breadth at base of interspaces 1-7, all these very distinctly divided by the broadly black-bordered veins, the spot in interspace 4 more or less obsolescent; lastly, a subterminal row of more or less crescentic white spots, the lower two shaded with crimson followed by a crimson tornal and a terminal similar but brighter spot at apex of vein 3, the spatulate tail black.
Underside similar; the ground-colour duller. Hind wing: a white discal spot often in interspace below vein 1, the lower two spots of the terminal series entirely crimson.
Antennae, thorax and abdomen above up to the preanal segment black; head, palpi, sides of the thorax and rest of the abdomen crimson, the abdomen with black lateral spots.
Female similar; fore wing paler. Hind wing: the central white markings larger, the subterminal spot in interspace 2 white, coalescent with the crimson tornal spot. Antennae, head, thorax and abdomen as in the male.