I. Sub order: Caelifera 1. Acrididae: (Locusts, Grasshoppers)
Antenna is short
Tarsus is three segmented
Ovipositor is short and horny
Tympanum is located one on either side of the first abdominal segment.
Sound is produced by
femoro-alary mechanism. A row of
peg like projections found on
the innerside of each hindfemur is rubbed against the hard
radial vein of the closed
tegmen.
Locusts are a serious threat to tropical agriculture. They swarm under favourable
conditions and mainly feed on grasses, cereals etc.