230 
HEMIPTERA. 
the middle of August tlie insects come to their growth and 
acquire their wings ; but the mischief at this time is finished, 
and the plants have suffered so much that all prospect of 
a second crop of beans, from new shoots produced after 
the old stems are cut down, is frustrated. 
These leaf-hoppers have the same agility in their motions 
and apparently the same habits, as the vine-hoppers ; but 
in the perfect state they are longer, mox-e slender, and much 
more delicate. They are of a pale green color ; the wing- 
covers and wings are transparent and colorless ; and the 
last joint of the hind feet is bluish. The head, as seen 
from above, is crescent-shaped, and the two eyelets are sit- 
uated on its front edge. The male has two long recurved 
feathery threads at the extremity of the body. The length 
of this species is rather more than one tenth, but less than 
three twentieths of an inch. It may be called Tettigonia 
Fabce. Probably it passes the winter in the same way as 
the vine-hopper. 
2. Plant-lice. ( Aphididee .) 
The Aphidians, in which group we include the insects 
commonly known by the name of plant-lice, differ remarka- 
bly from all the foregoing in their appearance, their forma- 
tion, and their manner of increase. Their bodies are very 
soft, and usually more or less oval. The females are often 
without wing-covers and wings ; and the former, when they 
exist, do not differ in texture from the wings, but are usually 
much larger and more useful in flight. We may therefore 
cease to call these parts wing-covers, in all the remaining 
insects of this order, and apply to them the name of upper 
wines. 
Some of the Aphidians have the power of leaping, like the 
leaf-hoppers, from which, however, they differ in having very 
large and transparent upper wings, which cover the sides of 
the body like a very steep roof ; and their antennae are pretty 
long and threadlike, and are tipped with two short bristles 
