Females and immatures are pale, yellowish brown with tho bold lines running along the length of the abdomen. The wings have a yellow costa and a very dark brown or black pterostigma.
The males develop a blue pruinescence on the abdomen darkening to the rear with with S8-10 becoming black. Its eyes are very dark green. They fly swift and low, skimming the water surface.
Females retain their colur and markings though they become quite greyish brown with age.