This is the only species in this genus. The territorial male has green eyes with a white face, a black and yellow thorax with a powder blue abdomen that is darkened at the tip. The secretive female is brown-blackish with yellow-green marks. The abdomen is short, especially in females. The body length varies from 0.9 to 1.8 inches, depending on the gender. The juvenile has a black abdomen with interrupted yellow stripes and red-brown eyes.
This species is common throughout southernmost Canada and United States, except for the Great Basin area. With a preference for a variety of habitats, it is usually found at well-vegetated ponds, lake bays, marshes, bogs, slow streams, and ditches. It is widely distributed throughout Wisconsin, and there is some evidence that this species has been increasing its range northward in recent years.
Late June to mid-September in Wisconsin.