Chalcolestes viridis, old female in cleanups ;)
In the following image the bending of the abdomen is also characteristic of ovipostures.
In all Odonata (Dragonflies and damselflies) male specimens the bending of the abdomen is a mechanism used to sperm transference to secondary genitalia.
''Chalcolestes viridis'', formerly ''Lestes viridis'', is a damselfly of the family Lestidae. It has a metallic green body and at rest it holds its wings away from its body. Its common name is the Willow Emerald Damselfly or the Western Willow Spreadwing.