The male blue corporal has a rather dark blue body, a black head, and dark marks at the wing bases. Females and young males are brownish and have two short stripes on the side of the thorax, behind the eye: a yellow stripe above a black one. This pair of "corporal stripes" apparently gave this dragonfly its name. As males mature, they show a blend of male and female coloration.
While many dragonfly species fly all summer long, adults of this species occur only in springtime (March through May): They emerge as adults in early spring, mate, lay eggs, then die. The immature forms, like those of other dragonflies, are aquatic and relatively long-lived.
Learn more about this and other dragonflies on their group page.