Over all length 3.5 - 4mm. A black, ant-like fly with clear wings that have a dark stigma. The adults wave their wings to display as they run about over the surface of a leaf. There are several very similar species.
Normaly damp and boggy areas. The larvae develop in dung or rotting vegetation.
Status and distribution
The genus is widely spread through Britain but tends to have a slight southerly bias. Often seen on the reserve (probably Sepsis fulgens).
Best time to see
May to September