These dragonflies are called "platbuik" in Dutch, which translates as "flatbelly". The English name is the less flattering broad-bodied chaser (Libellula depressa).
We found them yesterday sitting at the water's edge, as we were:
Olympus Stylus 1s, 300mm, ISO125, f5.6, 1/500s
Olympus Stylus 1s, 300mm, ISO200, f8, 1/250s
Those two are males; the females are yellow:
Olympus Stylus 1s, 300mm, ISO200, f8, 1/200s
Thanks for watching!