1. Meso- and metathoracic legs long, their femora about as long as head capsule, their tibiae each produced distally inot prominent process from which stout spur arises; case usually squari in cross section, composed of small piece of plant material fastened transversely, although case sometimes cylindrical and largely of silken secretion, or occasionally of small rock fragments; . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Branchycentrus
Meso- and metathoracic legs shorter, their femora much shorter than head capsule, each tibia not produced distally into prominent process, although spur arises from about same point on unmodified tibia. Transverse pronotal groove curving anteriorly, with ends of groove usually meeting anterior margin, each end sometimes forming rounded lateral lobe; brown, sclerotized band on either side of anus; mesonotal sa1 with multiple setae or solitary seta on each side. Two species in Ohio (M. rusticum and M. wataga). Rare, only 1 adult specimen of each species reported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Micrasema
Key to Genera of Brachycentridae Nymphs