Pareronia ceylanica, the dark wanderer,[1][2] is a medium-sized butterfly of the family Pieridae, that is, the yellows and whites.

Hindwing: the terminal black border very broad, narrowing slightly but distinctly towards the tornal angle.

The female closely resembles the female of P. valeria, but on the upperside the outer black margins beyond the discal markings on both forewings and hindwings are proportionately much broader, the transverse subterminal series of spots that crosses the wing is further from the terminal edge.

On the underside the terminal black borders are broader and darker, the subterminal series of spots on apex of the forewing and on the hindwing absent or so very thickly overlaid with the dusky brownish black of the terminal margin as to be very indistinct and blurred.

"[3] "Suspended by the tail and by a very long band ... thoracic portion bent back almost at right angles to the abdominal; head produced into a very long sharp snout; wing-cases forming a keel nearly half an inch in depth, and so thin as to be almost transparent.