282 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
F. Tarsi four-jointed. Ocelli usually absent. Tegmina sloping at the 
sides of the body (except a small area near the base in male). Ovi- 
positor compressed, blade-like, the tip not enlarged Katydids, 
Long-horned Grasshoppers, Cave-crickets, Family Tettigoniidae, 
p. 333. 
FF. Tarsi three-jointed. OcelU variable. Tegmina flat above, bent 
abruptly dowTi at the sides in both sexes. Ovipositor usually 
visible as a cyUndrical, straight, or up-curved needle-like organ, 
the tip very slightly enlarged Crickets, Tree-crickets, Mole- 
crickets, Family Gryllidae, p. 384. 
EE. Antennae shorter than the body, of varied form. Ocelli present. 
Tarsi usually three-jointed. Auditory organs at sides of base of 
abdomen. Stridulation produced (in large part) by rubbing the hind 
thighs against the tegmina. Ovipositor composed of a dorsal and a 
ventral pair of short, curved pieces moving vertically, with acutely 
pointed, divergent tips. . . . True Locusts, Short-horned Grasshoppers, 
Family Acrididae, p. 423. 
