230 HEMIPTERA. 



the middle of August the 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, more 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 Tettiyonia 

 Fabce. Probably it passes the winter in the same way as 

 the vine-hopper. 



2. PLANT-LICE. (Aphidida.) 



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 veiy 

 soft, and usually more or less oval. The females are often 

 without wing-covers and wings ; and the former, when they 

 erist, 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 

 wings. 



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 



