The female is on the left and the male is on the right
No interactions present.
Male: - This small darter is almost entirely black along its upper surface. The central black band on the thorax flank encloses three yellow spots.
There are yellow markings on the flanks of the thorax and abdomen. Abdominal segments 3 to 5 contract and expand to form a club-like appearance. As the males age the yellow markings darken, very old males being all black.
Female: - The female is predominantly yellow with a black underbody. The upper surface of the thorax is centrally marked with a black isosceles triangle, the base of which is just behind the eyes. The base of the each wing has a small area suffused with saffron.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.3, -1.0
OS grid ref: SU7461