Over all length 6 - 8mm. A grey fly with a pale yellow scutellum. The wings are milky with black bands across them.
Meadows, woodland edges and hedgerows where thistles grow. The larvae develop in the flower-heads of Cirsium and Carduus thistles.
Status and distribution
Distributed mainly through the southern half of Britain. Uncommon on the reserve.
Best time to see
Mid june to early September.