48 INSECTA. 
ple eyes are situated between them or laterally(1), but upt near the 
front. 
These Insects are also closely allied to the Jassi by the extent of 
their laminz, situated along the sides of the hood, and the length of 
the terminal seta of the antenne; it appears to be articulated at base 
as in the Cicci, from which they almost only differ in the form of 
the thorax(2). , 
FAMILY JI. 
APHIDII. 
The second family of the homopterous Hemiptera, or the 
fourth of the order, is distinguished from the preceding one 
by the tarsi, which are composed of but two joints, and by the 
filiform or setaceous antenne, which are longer than the head 
and have from six to eleven joints. 
Those individuals which are winged always have two ely- 
tra and two wings. 
These Insects are very small; their body is an soft, 
and their elytra are nearly similar to the wings, or only differ 
from them in being larger and somewhat thick. They are 
astonishingly prolific. 
Here the antenne are composed of reed ten to eleven joints, the 
last of which is terminated by two setz. 
They possess the faculty of leaping, and form the genus 
Psytua, Geofl.—Chermes, Lin. 
These Hemiptera, also called pseudo-aphides, or faux-pucerons, 
live on the trees and plants from which they derive their nourish- 
ment; both sexes are furnished with wings. Their larve usually 
(1) Some species, such as the Cercopis grisea, trunsversa, striata, &e., Fab., on 
account of their flattened head furnished near its edges with simple eyes, should 
apparently be formed into a separate subgenus. 
(2) Germar, Magas. der Entom., IV, p. 58, genus Tettigonia, Fab., Syst. Ryn- 
got., p. 61. 
