Wingspan 9-11 mm.
A pale grey moth with whitish head and white transverse line across the middle of the forewing.
It occurs in woodland habitats in England, Wales and locally in Ireland.
Tufted hair-grass (Deschampsia cespitosa) and blue moor-grass (Sesleria caerulea) are the main foodplants, the larvae forming gallery mines.
There are two generations flying from May to July and again in August.