It is also known as a Dragon Hunter.
Description: The Dragonhunter is a member of the gomphid dragonfly family (family Gomphidae). Mostly stream-haunting insects, gomphid dragonflies, 1 7/8-3" (48-76 mm) long, rest on logs, stones, and leaves, or dart from one resting place to another, seizing prey along the way. Only a few species frequent ponds. The adult is easily recognized by the widely separated compound eyes and sprawling legs. The female lacks an ovipositor and flies alone over the water, striking the tip of her abdomen through the water surface, each time discharging many eggs. Naiads have wedge-shaped heads and thick, 4-segmented antennae. Using their stiff legs, they burrow in bottom debris. There are about 10 genera in North America.
Cut and pasted from Audubon Field Guide.