The medium-sized, dark brown striped emeralds have some pale markings on the thorax and abdomen, black legs, clear wings and brilliant green eyes. The thorax has a metallic bronze-green sheen and the abdomen is dark metallic black-green. Most species are uncommonly seen, but this may be largely due to their secretive nature. When flying, most species look alike which is why in-hand identifications of their anatomical features are often needed.
This dark emerald, about 1.7 inches long, has a very slender abdomen with almost no markings at all. Because of the very long, slender abdomen and black markings at the base of the hind wings, this species is easily separated from other Somatochlora species.
Common throughout Canada and northern United States, it is usually found at spring-fed sphagnum bogs or fens, generally not next to open waters. It is occasionally found at appropriate habitats in northern Wisconsin.
Late May to early August in Wisconsin.