Graphium eurypylus, the great jay or pale green triangle, is a species of tropical butterfly belonging to the family Papilionidae.

The undersides of the wings are similar to the uppersides, but the basic colour is brownish and the spots are paler or whitish.

Underside: brownish-fulvous black; markings similar, larger, their edges diffuse and all of a silvery white, slightly tinted with pale green.

Hindwing in addition has a white basal streak that extends halfway down the dorsal margin; another shorter white subbasal streak from costa to the subcostal vein coalescent with the white of the discal band in the cell, the streak of ground colour that lies between this subbasal and the discal band jet black, interrupted where it crosses vein 8 by a crimson spot; finally, quadrate black spots near apex of cell and at bases of interspaces 1, 2 and 3, all outwardly margined with crimson.

Underside of hindwing: crimson spots more conspicuous, a line of crimson along the posterior portion of the dorsal margin; in most specimens the short subbasal narrow band of white that runs from the costa to the subcostal vein does not coalesce with the white of the discal band where it crosses the cell.