A brown and rather plain hawker, with largely clear wings and conspicuous green eyes. The yellow triangle on S2 is diagnostic, as are the colour and shape of the hindwing base. Males patrol marshy ditches, reedy lakesides and other lush, calm waters.
Total: 62-66 mm.
Abdomen: 47-54 mm.
Hindwing: 39-45 mm.
Ditches, marshes, ponds and lakes with rich vegetation. Favours swamps of Water-soldier (Stratiotes aloides) in most of its northern range. Sometimes on running water in the south.
May to August. Most abundant in June.