Both wings marked as in Papilio demoleus Linn., but on the posterior wings the stramineous band which crosses the wings before the middle is broader, and the spots in the submarginal row are more lunulate; at the lower end of the dark rufous spot above the anal angle is a large subovate black spot; and the middle median nervule is produced into a rather longer tail than in P. demoleus.

Nearly resembling the male, but on the posterior wings a space on each side of the large ocellus below the costal nervure is bright ferruginous.

On the disk, the space between the stramineous band and the row of submarginal lunules is brightly irrorated with stramineous scales, in which, between the veins, are spaces less densely irrorated with the same colour, giving the appearance of indistinct black spots, with clusters of blue scales more or less distinct below each, resembling somewhat the mottled appearance of the posterior wings of P. ophidicephalus, Oberth.

Posterior wings with the apices of the submarginal lunules much elongated, almost extending to the spots of the marginal row, which are fully developed.

Both the latter species are among the commonest butterflies in their respective countries; and the true P. Demoleus is common in Madagascar, as well as on the continent of Africa.

P. erithonioides is a much larger insect than P. erithonius, and the development of the tails in the female is very remarkable.