Thoressa sitala, the Tamil ace[1] or Sitala ace, is a butterfly belonging to the family Hesperiidae found in south India.

Hindwing without markings, the middle portion of the wing with some long, ochreous hairs.

Cilia of both wings ochreous, with brown patches at the vein ends in the forewing only.

Forewing with more than the lower half of the wing blackish-brown; the apical and costal portions broadly ferruginous-ochreous; the spots as on the upperside.

Antennae black, dotted with white on the underside, the apical half of the club ferruginous, the basal half white beneath; palpi, head and body and the legs blackish-brown; palpi beneath and the pectus grey.