A large pale blue male of this species, aggressively defending a garden pond or small natural pool, is a common sight. The abdomen shape and four large black areas at the wing bases instantly distinguish the species. Female and immature male are quite evenly yellowish brown.
Total: 39-48 mm.
Abdomen: 22-31 mm.
Hindwing: 32-38 mm.
A wide range of mostly stagnant waters, especially favoring those that are small, shallow, sunny and bare.
From late April to mid September. Most abundant in May and June.