SummaryThe kinematics and jumping performance of treehoppers (Hemiptera, Auchenorrhyncha, Membracidae) were analysed from high speed images. The 8 species analysed had an 11 fold range of body mass (3.8 mg to 41 mg) and a 2 fold range of body lengths (4.1 to 8.4 mm). Body shape was dominated by a prothoracic helmet that projected dorsally and posteriorly over the body, and in some species forwards to form a protruding horn. Jumping was propelled by rapid depression of the trochantera of the hind legs. The hind legs were only 30 – 60 % longer than the front and middle legs, and 47 – 94% the length of the body in different species. They were slung beneath the body and moved together in the same plane. In preparation for a jump, the hind legs were initially levated and rotated forwards so that the femora were pressed into indentations of the coxae. The tibiae were flexed about the femora and the tarsi were placed on the ground directly beneath the lateral edges of the abdomen. Movements of the front and middle legs adjusted the angle of the body relative to the ground, but for most treehoppers this angle was small so that the body was almost parallel to the ground. The rapid depression of the hind legs accelerated the body to take-off in 1.2 ms in the lighter treehoppers and 3.7 ms in the heavier ones. Take-off velocities of 2.1 – 2.7 m s-1 were achieved and were not correlated with body mass. In the best jumps, these performances involved accelerations of 560 – 2450 m s-2 (g forces of 47- 250), an energy expenditure of 13.5 – 101 µJ, a power output of 12 – 32 mW and exerted a force or 9.5 – 29 mN. The power output per mass of muscle far exceeds the maximum active contractile limit of normal muscle. Such requirements indicate that treehoppers must be using a power amplification mechanism in a catapult-like action. Some jumps were preceded by flapping movements of the wings, but the propulsive movements of the hind legs were critical in achieving take-off.