Good one Paul!. This is exactly how I mostly see these guys or in cahoots with a swarm on a feeding frenzy over a hatch. I have found a way to stalk them as you rarely find them perched. Near me are some prairies and they will lay very low on the sunlit side of the paths. The chances are you will scare up about 95% of them the moment you get within a few feet as they blend so well.
Look down a couple feet ahead before taking each step. If you do not spook them I have been able to use macros with a couple feet of them.