Fig. 8. Actions of hind leg trochanteral muscles of Aphrodes during jumping. Simultaneous recordings from trochanteral depressor (upper trace) and levator (lower trace) muscles of the right hind leg during a jump. Selected frames of the leg movements from high-speed images are shown above at the times indicated in this and Figs 10, 11 (scale bar on right frame, 1 mm). The activity in the two muscles began when both hind legs were already levated and resulted in an anterior movement of both (horizontal lines). The activity in the depressor increased before the jump movement while that in the levator declined.