Both the upper and lower wings are bright white, with some small light brown markings.

The species epithet is derived from Polyphemus, a character in Greek mythology, from the small eyespots on the wing.

(68c) differs from its Brazilian relatives in the chalky white upper surface of both wings with delicate mother-of-pearl gloss, and also in the projecting apex of the forewing and the sharp teeth of the hindwing.

On the upper surface the black distal bordering is absent and the discocellular shows only a quite narrow stripe.

The flight of polyphemus is extremely rapid and irregular, and according to Godman and Salvin the species ascends in Guatemala to 4000 ft. [1200 m] and is often met with near the ground in villages or also high up round the tops of trees in the timber-forest.