The wingspan is 10–11 millimetres (0.39–0.43 in). The moth flies from April to May depending on the location.
The larvae feed on various grasses, primarily Arrhenatherum elatius, Festuca arundinacea and Creeping Soft Grass. The mine is flat and translucent and can run either up or down. They are dirty yellow, but grey green above. The head is brown. Larvae can be found in early spring.
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