Eooxylides tharis has dark brown upperwings with white markings and black spots on the tornal part of the hind wings, in males the dorsal area of the forewings and the tornal area of the hind wings are sprinkled with blue. The underside of the wings are reddish orange in color, has black submarginal spots on the white tornal area of the hind wings. The hind wings are toothed at the ends of the 1st and 3rd veins, and have a long white tail at the ends of the 2nd vein.
Larva: Eooxylides tharis larvae are golden yellow to dark red in color, have dorsal nectary organs in the 7th abdominal segment and tentacle organs in the 8th abdominal segment. The surface of the body looks smooth but is covered with many small holes and short setae.
Pupa: Eooxylides tharis pupae are green with dark spots of various sizes on the dorsum of the abdomen, dark brown to black wingboxes with whitish patches, yellow spiracules and protruding colors.