The fore wings: Male. Length forewing/wingspan 62-67/102-114 mm. Upperside and underside forewing black with inconspicuous pale stripes on both sides of veins. H
The hind wings: Hindwing outer margin slghtly crenulate; upperside black, half of the wing, including the strongly enlarged anal area, pale brown; underside black with narrow red patch and sometimes red submarginal crescents.
Sex differences: Female. Length forewing/wingspan 73-75/117-120 mm. Upperside and underside forewing dark brown with strongly developed pale stripes on both sides of veins, suggesting that the pale color is the ground color instead of the dark brown color. Hindwing outer margin crenulate, but not developing into tails; upperside brown, darker towards outer margin, indistinct reddish submarginal crescents and band from space 1c to 5; underside black with pink to reddish submarginal crescents and narrow band from hinf margin to vein 6.
Variation and infraspecific taxa: Little variation known.
Similar species: Unmistakable species.