Bibasis sena has dark brown upperwings without markings, dark brown undersides with a white discal band protruding from the hind wings from space 1b to the costa. White discal bands are also present on the underside of the forewings with glowing purplish-blue patches. The hind wings of the tornus are decorated with orange cilia along the termen. The legs are pale yellowish orange.
Larva: The larvae of Bibasis sena have a whitish, cylindrical body with four red-orange patches on the sides. The head is orange, the body is covered with white setae rather long at the dorso-lateral and sub-spiracles when hatching. At the next instar, the body of the caterpillar is yellowish with black bands across the body segments. Setae on the surface of his body shortens.
Pupa: Bibasis sena pupae are whitish with yellowish patches, but the next day they turn pale brown and are coated with a thin, whitish layer of powdery substance. There are small dorso-lateral and lateral black spots on most segments of the body.