Tirsa

Tirsa is a genus of moths of the family Crambidae, containing only one species Tirsa fiona. It is found in French Polynesia (Rapa Iti).

The wingspan is 24–28 mm. It is a dark brown moth with dark camouflaging speckles throughout its body. It is also known for its long, narrow antennae, which often extend back over its head, rather than ahead.