Adults of most species are 10-55 mm long, with a dark brown or blackish brown body, short cerci, and long antennae. Larvae have divergent wing pads and live in rivers, feeding on plant material. Adults emerge from January through April; they may feed on flowers.

Winter stonefly, Strophopteryx fasciata Adults are 1015 mm long, dark brown, and the cerci have 1-3 segments. Adults emerge from February to May and crawl on stones, fence posts, and the sides of buildings, especially if painted white. This species occurs in northeastern North America.

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