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The adults reach 10–12 millimetres (0.39–0.47 in) of length, with a wingspan of 25–30 millimetres (0.98–1.18 in) and are fearsome predators, primarily feeding on aphids, occasionally on flower nectar. They can be encountered from May through August in cool and shady areas, mainly in deciduous woods, woodland edges and shrubs.
The basic coloration of the body is green. Wings are blue-green with black veins. Several black markings are present on the head, the thorax and below the abdomen.