Common by still waters in most of Europe. Easily recognised by its large size, brown body and the black wing spots for which it is named, one at the node of each wing.
Total: 40-48 mm.
Abdomen: 27-32 mm.
Hindwing: 32-40 mm.
Most still waters, preferably with well-developed vegetation, and can be very numerous on acidic lakes.
From late April to mid September. Most abundant in early summer.