11 



Plate 1. No. 1, is a branch of an 

 apple-tree with the appearance it makes 

 when the insect is feeding on it. 



No. 2. is a piece of the root of an 

 apple-tree with the aphis feeding on it in 

 a similar manner. 



No. 3. is the aphis magnified and 

 the egg, as it appears among the down 

 in which the insect is enveloped, when 

 the weather occasions it to take shelter. 



No. 4>. is the insect more highly mag- 

 nified. 



No. 5. is an aphis that has acquired 

 wings ; these are by no means so plentiful 

 as those without. I regret that I cannot 

 speak with certainty, if this is a different 

 sex, or whether it acquires the wings from 

 age, which is supposed to be the case with 

 other species of aphis. In investigating the 

 common green fly, which are so frequent 

 on green house plants, and on rose trees 

 inthe spring of the year, we perceive some 

 which are oviparous and others that are 

 viviparous. This circumstance was, I 

 believe, first noticed by Mr. Curtis, and 

 it, in some degree, accounts for their mul- 



