Wing length 6 to 8mm. This is a genus with several very similar species. The head, thorax and abdomen are shiny black, with a pale stripe down the centre of the thorax. The wings are tinged brown and the legs are pale with dark femora.
Emergent vegetation close to still or slow water. The larvae develop in marshy or boggy places, especially in sedges.
Status and distribution
Fairly common and widespread throughout Britain, though can be local. Uncommon in Nottinghamshire and recorded once at Netherfield Lagoons.
Best time to see
May to June.