Please identify these dragons.

This is the first time I have tried to shhot dragonflies. Been a bit of a learning experience finding the critters then discovering how they like their own little perches so if you wait they come back etc. I had very little joy of them in flight though with only one sharp shot which was of the back end lol.

I still have a long way to go on the learning curve and below is what I got today. Can you identify the species for me? Also any tips appreciated with regards to dragons.

All taken with the 7D and a 100-400 with 32mm of extension tubes attached.