5 . THE CHERRY. 
AFFECTING THE LEAVES. 
Black wingless lice with a few winged ones, their wings appearing like white 
parallel lines each side of the body; covering the under side of the young 
leaves. 
The Cherry Plant-louse. Aphis Cerasi , Fabricius. . 
No tree or plant within the sphere of my observation is so con¬ 
stantly infested with Aphides as the garden cherry, the Prunus 
Cerasus of Linnaeus, Cerasus vulgaris of modern botanists. Upon 
other vegetation where these vermin become located they are 
commonly broken up by their insect enemies after 1 a time and do 
not again become established upon the same tree. But upon the 
cherry within a week or two after every individual appears to be 
destroyed new colonies are discovered to be planted upon one and 
another of the young leaves. 
This species commences to appear as sion as the leaves begin 
to put forth in the spring, these first individuals being hatched 
from eggs w'hich were deposited the preceding autumn. All the 
individuals which are bred during the spring and summer appear 
to be females, some of them with wings upon almost every leaf, 
but most of them without wings. The individuals which are 
hatched from the eggs resemble the mature wingless females, ex¬ 
cept that they are smaller and lighter colored, none of the species 
of this family passing through those remarkable changes in their 
form which most of the orders of insects undergo. They bring 
forth their young alive during the continuance of warm weather. 
These huddle around their parents upon the under surface of the 
leaves as closely as they can crowd themselves; indeed they often 
are found two deep, a portion of the colony standing upon the 
backs of the others, requiring only sufficient space between them 
to insert their beaks into the leaves to suck jtheir juices. The 
