276 
SYSTEMATIC ARRANGEMENT. 
the membranous expansion of the hinder tibiae lutc- 
ous, variegated with testaceous, and marked with 
a group of small black spots near the middle of the 
exterior portion. 
Homoptera. 
This, the second great division of the Hemipterous 
order, will he readily distinguished by having the 
rostrum apparently originating from the lower part 
of the head, near the breast; the hemelytra of a 
uniform consistence, approaching to membranous, 
throughout their whole extent ; never overlapping 
each other w'hen closed, and inclined on each side, 
forming a kind of roof over the body; the latter 
thick and convex ; mesothorax and metathorax more 
developed than the prothorax; antennae short and 
inconspicuous, terminating in a bristle ; scutellum 
minute ; ovipositor always distinct. 
The above characters sufficiently indicate that this 
section is widely dissimilar from the former. The 
differences are not confined to external and structural 
attributes, but also extend to modes of life, the Ho- 
moptera living exclusively on vegetable juices, while 
the Heteroptera are more partial to the blood of ani- 
mals. It contains several well defined families, of 
which we shall first attend to that of the Cicadidse 
or frog-hoppers. 
Fam. Cicadid.®. 
In these the antennae are very short and setaceous, 
composed of from three to seven joints, scarcely pro- 
jecting beyond the head, (PI. XVIII. fig. 2, c, c,) the 
