The 'Common Hawker' or 'Sedge Darner' (''Aeshna juncea'') is one of the larger species of hawker
dragonflies, native throughout
Eurasia and northern
North America. The flight period is from June to early October.
It is 74 mm long with a brown body. The male has black abdomen with paired blue and yellow spots on each abdominal segment, and narrow stripes along the
dorsal surface of the
thorax. In the female the
abdomen is brown with yellow or sometimes green or blue spots. The wings of both sexes display a yellow costa (the major vein running along the leading edge of the wings). This species lacks the green thorax stripes of the
Southern Hawker.

Common Hawker (male) hovering.
References
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Aeshna juncea species information at Dragonfly Ireland