The female Isosceles Hawker (Aeshna isoceles ali Anaciaeschna isoceles) has slate-green eyes and a light brown body, which typically measures between 62 and 66 mm in length, and its wingspan is about 8.5 cm. The body of an adult male Isosceles Hawker is more or less uniformly brown. On the sides of the thorax stand out greenish-yellow bands, on the dorsal side of the hind abdomen there is a conspicuous yellow triangle on the second segment. For this species, bluish-green eyes and an amber-coloured band at the base of the hind pair of wings and a grayish membrane around it are also characteristic.
The females are similarly colored to males; their abdomen is somewhat more rounded.
Male Isosceles Hawkers, unlike most other members of the dragonfly family, during patrol of their territory, often perch and survey the area from a lookout.
The habitat of the Isosceles Hawker includes ditches, channels, marshes, lakes, less frequently also watercourses, but for its well-being it needs enough water and stands of cattails (Typha sp.) or common reed (Phragmites australis).
Adult individuals appear as early as May, and then fly until August. The Isosceles Hawker is most common in June, and begins to fly before most other species of its genus.
