The only Cordulegaster species in a large part of western and northern Europe. Easily recognised by the very large size, the black-and-yellow body pattern and the green eyes just meeting in a point on top of the head.
Total: 74-85 mm.
Abdomen: 52-69 mm.
Hindwing: 40-51 mm.
Streams and sometimes small rivers, often in forests but also in open moors and heaths.
From end of May to late August.