The Black Meadowhawk is quite small and dainty, and is easy to miss. It often perches on the damp, dark ground near the shore, where it blends in splendidly. It can also be a bit fidgety and hard to approach.
Here's a male showing off from a prominent perch above the ground.
Here's a side view, showing the hamules quite clearly.
The next photo shows the yellow spots and clear wings.
Females are more yellowish in overall color, and even more difficult to spot when perched.