258 NATURAL HISTORY. 
Fig. 205.—Female Katydid. 
a sword-like instrument: this is called an ovipositor— 
that is, an instrument for depositing the eggs in their 
right place. With it the insect pierces holes in the 
ground in the autumn, placing the eggs there, which are 
hatched the following year. Some time elapses between 
the birth of the Katydids and the attainment of their 
growth, and the full production of their wings, which is 
necessary to the production of the loud sound with which 
they greet our ears at night in the latter part of summer. 
446. The Locusts, one species of which you see repre- 
sented in Fig. 206, have, like the Grasshoppers, the roof- 
like arrangement of the wing-covers, but they have not 
that peculiar apparatus for the production of sound which 
the Grasshoppers have. They have also shorter anten- 
nz and stouter legs. They are insects of greater power. 
In some parts of the world they are the most extensive- 
