Polygrammodes atricosta is a moth in the Crambidae family. It was described by Hampson in 1913. It is found in Indonesia (Ambon Island). The wingspan is about 28 mm. The forewings are pale yellow, but the costa is black to beyond the middle and there is some blackish suffusion below it. There are traces of a brownish antemedial line and there is a black discoidal bar, as well as an indistinct fulvous postmedial line with a black point below costa. There is also an indistinct, waved, fulvous subterminal line. The hindwings are pale yellow with a black discoidal point, an indistinct fulvous postmedial line and a faint, minutely waved, fulvous subterminal line from the costa to vein 2.