Adults are about 10 mm long and grayish black to black. This is the largest family in the order, and adults emerge during the winter months. The wings are short and rudimentary in some species. Most of the species occur in eastern USA.

Small winter stoneflies, Allocapnia pygmaea Adults are 5-7 mm long, and dusky black. The immature stages are in creeks and lakes. Adults emerge in February through April, and may occur in large numbers on turfgrass, snow, the sides of buildings, and other objects in the peridomestic environment. This species occurs in northeastern USA; there are more than 30 species in the genus Allocapnia, and some of these occur in urban and suburban areas.

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