Body length 16 - 22mm. The abdominal segments are black with three grey marks on each one. A large, robust fly.
Ditches, marshland and woodland. The larvae prey on worms, molluscs and other fly larvae in wet mud.
Status and distribution
Widely distributed in southern Britain, but local. Uncommon in Nottinghamshire and recorded once at Netherfield Lagoons.
Best time to see
May to September.