162 DISEASES or THE COTTON PLANT. 
They are able to run about and leap witb great agility, but 
are entirely destitute of the rudiments of wings, except in 
the pupa state. It is only the perfect insects whicb are 
able to perpetuate their kind. They are generally fur- 
nished with ample wings, which enable them to fly from 
field to field. Grasshoppers and locusts do much harm, 
wben very numerous, to grass and vegetables, and even to 
firuit-trees, as well as to cotton. Turkeys, ducks, and 
other fowls feed upon tbem with great avidity, and are 
very useful in diminishing their numbers. In some of the 
Northern States, they have been destroyed by means of 
sheets spread upon poles, so as to sweep them into a bag 
fastened behind, which is drawn over the fields infested 
by them ; they are then killed by means of boiling water 
or fire. 
The Leaf-Hoppee. — [Tettigonia ?) 
The leaves of the cotton-plant are often injured by the 
leaf-hopper. This small insect is found upon the plant in 
the larva, pupa, and perfect state. In all these forms, it 
sucks the sap from the leaf, causing small diseased and 
whitish-looking spots, much disfiguring the foliage, and 
injuring the plant itself, when the insects are very numer- 
ous. They are also found in great numbers on grape- 
vines, in Florida, and injure the foliage to a considerable 
degree. 
The perfect insects are very small, measuring only from 
one-tenth to three-twentieths of an inch in length. The 
head is somewhat crescent-shaped, of a green color, with 
two red spots on the upper surface. The thorax is also 
green, with two crescentr-shaped spots of red on each side 
of a small red spot in the centre. The wing-cases are 
green, with two stripes or bands of red, running parallel 
