Phostria obscurata

Phostria obscurata is a species of moth in the family Crambidae described by Frederic Moore in 1885. It is found in Taiwan, India, Sri Lanka, Singapore and Myanmar.

Description
Adults are purplish brown. The forewings have an extremely indistinct blackish transverse outwardly curved narrow antemedial band, and an irregular postmedial band. There is a spot in the middle of the cell, and a streak at the end. The hindwings have a similar irregular discal band.