Polygrammodes herminealis is a moth in the Crambidae family. It was described by Schaus in 1920. It is found in Brazil (Paraná). The wingspan is about 32 mm. The wings are white with marginal orange spots on the interspaces. There is a basal orange streak on the forewings, from the costa to the submedian. There is also a subbasal black point on the costa, and smaller dark brown points below the median and on the inner margin, as well as an antemedial orange brown lunule in the cell and a dark brown vertical streak below the cell. There is a point on the inner margin, a medial dark brown vertical streak below the subcostal, and a similar streak on the discocellular, a medial vertical streak on the inner margin and short streaks above and below vein 4 near the cell, as well as fine postmedia