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.[1]
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.[2]