This is a very large dragonfly with a length of 2 3/4 to 3 1/8 inches (68 to 80 mm). The thorax of the male is brownish green to yellowish green and unmarked. The abdomen is bright blue, changing to green towards the rear, and marked with black. The female is primarily yellowish green and marked with brownish black on the abdomen.
Can be found near weedy ponds and lakes at low elevations.