ABSTRACT
Pronotum transverse to subquadrate, lateral margins entire, posterior margin without acute angles, about as wide or narrower than elytra; pronotal margins in many strongly reflexed. Prothoracic coxae conical, projecting well below prosternum, attached externally, contiguous; prothoracic coxal cavities widely open; prothoracic trochantin exposed. Mesothoracic coxae contiguous, prominent in most, cavities open laterally. Scutellum well developed and visible. Metasternum with lateral margins straight (Driloniinae) or sinuate (Omethinae, Matheteinae); metathoracic coxae flattened, contiguous or narrowly separated. Legs more or less elongate, slender; tibiae with paired apical spurs. Tarsal formula 5-5-5; tarsomeres 3 and 4 with deeply bifid ventral membranous lobes; tarsomeres 1 and 2 sometimes with finely setose ventral pads (Matheteinae); tarsal claws in most with a reduced basal tooth, in some more or less appendiculate.
