When dragonflies mate, they usually assume a “wheel” position, in which the male grasps the female by the back of her head and she bends her abdomen towards his thorax. The position appears to be both awkward and acrobatic, but amazingly the dragonflies are able to fly while in this position.
I was searching for dragonflies last week at Occoquan Bay National Wildlife Refuge when a pair of mating Calico Pennant dragonflies (Celithemis elisa) flew by me and landed in some nearby vegetation. Calico Pennants are some of the most spectacular dragonflies in our area, with bright colors and distinctive patches on their wings.
Feeling a bit like a voyeur, I moved a little closer to them and slowly crouched a bit to get a better angle for my shot. In the image below, you can see how the female grasps the abdomen of the male during this process.
I was happy to be able to get most of the two dragonflies in focus, which is always a challenge in situations like this.
© Michael Q. Powell. All rights reserved.
Mike Powell 
You have an abundance of different colourful species over the pond Mike, I must make an effort and visit.
Regards
Dave UK.