Fig. 11. Co-ordination of the legs during horizontal walking by a Empoasca. The legs were moved in a tripod gait with the hind legs contributing to each step. The contribution of the long hind legs imparted a sideways movement to the body so that it oscillated about the mean forward path. Images were captured at 1000 frames s^–1; pictures at the top show three images from one step cycle at the times indicated. Scale bar, 2 mm.