One of 35 Nearctic species in the genus.
Mature males: In dorsal and lateral views, only segment 9 is completely blue. Eyespots are small and narrow and connected by an occipital bar. Predominantly black abdomen in the middle segments; in dorsal view narrow blue rings are present.
In the United States, from the Great Plains eastward. The range also continues from Texas into Mexico. In Canada, reported from these provinces: Ontario, Quebec, New Brunswick, and Nova Scotia.
May to September in most areas.