This fly's larvae mine the leaves of Dogwood. The mines are long, and are on the upper surface of the leaf. The frass inside the mine forms a broad dark-brown central band. The mines are encountered more often than the adult fly.
Where Dogwood is present.
Mines can be seen in summer and autumn.
Widespread in Britain, though not well recorded.
Thought to be fairly frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015