1. Middle ocellar tubercle short-triangulate, as long as basal width. Lateral projection of abdominal tergum 2 not developed, with length less than basal width, and with apex forming blunt right angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sparbarus maculatus
Middle ocellar tubercle relatively elongate, with width abut 1.5-2.0 X basal width. Abdominal tergum with moderately developed triangulate lateral projection, with length subequal to basal width, and with apex forming acute angle . . . . . . . Sparbarus lacustris
Key to Ohio Sparbarus Nymph Species