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This is the male with a blue abdomen and black tail segments. It can be told apart from blue bodied Chaser dragonflies by the absence of dark basal wing patches. The male Keeled Skimmer has an all blue abdomen.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 52.364, -6.3713
OS grid ref: SM025829