This dragonfly was repeatedly tapping its rear end on the surface of the water. Haven't seen this before.
Common Whitetail
Plathemis lydia
female
Sabine National Forest,
Sabine Co., Texas
17 May 2013
Female Common Whitetail (Plathemis lydia), I think.
It looks very much as if this sturdy dragon has been dipped in white paint.
The male was hovering around the female who was flicking the water with her tail (depositing eggs?)
The Common Whitetail or Long-tailed Skimmer (Libellula lydia) is a common dragonfly