Yellow coster

Appearance

Male. Upperside yellow. Fore wing: veins along the costal margin broadly and apical half of those along the terminal margin narrowly black; a broad curved mark along the discocellulars, the apex and terminal margin more or less broadly also black, the last traversed by a series of spots of the ground-colour. Hind wing: apical half of the veins from 1 a to 8, subterminal zigzag and terminal slender lines, black, the subterminal line coalescing with the terminal along the veins. Underside: fore wing ground-colour yellow, getting paler towards apex, the veins conspicuously darker, the black discocellular mark showing through by transparency. Hind wing: ground-colour a delicate pinkish white, the veins conspicuously black; a broad subterminal ochraceous lunular band margined on both inner and outer sides by black lines, and a terminal, slender black line continued along the dorsum. Antennae, head, thorax and abdomen black, the thorax with a little ochraceous yellow pubescence anteriorly; thorax and abdomen beneath black sparingly marked and spotted with very pale ochraceous.

Female. Upperside: ground-colour a paler duller ochraceous yellow than in the male, with similar but broader black markings. Underside: ground-colour duller than in the male, the black markings showing through by transparency.