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The male is a medium sized dragonfly with steel blue eyes and two short yellow (antehumeral) stripes on the upper surface of the thorax. In flight the abdomen appears predominantly blue. At rest, a yellow triangle outlined in black can be seen located on the upper surface of the second abdominal segment. The leading edge (the costa) of the wings is black. On the most similar species, the Common Hawker (Aeshna juncea) the costa are yellow.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.3, -1.2
OS grid ref: SU5857