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Thorax blackish-bronze above, yellowish below, with clear wings. Two dark spots are found on the metepimeron. Male: 34-36 mm long, up to 42 mm in some populations. Inferior appendages less than half the length of superior appendages. Pruinosity develops with age at wing base and abdomen (segments 1,2, 8, 9 and 10). Female: 32-34 mm long, up to 39 mm in some populations. Pruinosity develops with age on the pterothorax and wing base.

Oviposition occurs in tandem well above the water line as late as mid September (Walker). The eggs complete katatrepsis (revolution of the embryo), and then enter a state of diapause, in which they remain until the following spring. When the eggs are wetted, development resumes. Adults tend to emerge en masse (Corbet).

Throughout Alberta, more prevalent in the south. Walker lists it as general in southern Alberta, but specimens have been collected up to N.W.T. Found throughout Canada, much more commonly in the south. Widespread in the U.S.A.