57 
In July of the same year specimens of this Aphid began to be sent 
to the office as being injurious to the nursery stock, and the fall nur- 
sery inspection showed it to be a serious pest in the nurseries, particu- 
larly on June-budded peach trees. The terminals are attacked early 
in the season and further growth is seriously checked. 
It soon became evident that this plant-louse was not one of the 
species commonly known to infest stone-fruit trees, as I had first 
supposed. 
Accordingly, on November 4, 1899, specimens of this insect were 
submitted through Dr. Howard to Mr. Pergande, who identified it as 
apparently a new species of the genus Aphis. (This information was 
accompanied by the statement, ‘SI think it well worth your while to 
make a careful study of this insect.”) 
San Jose seale overshadowed every other pest, and all of my time 
was occupied in dealing with it. At that time, therefore, it was out 
of the question to start any breeding work whatever, and nothing 
FIG. 2.—Aphis n. sp: winged form on peach and plum in Georgia, much enlarged 
(from drawing furnished by Scott). 
could be done on the Aphis more than to make general field notes. 
At the last session of the State legislature, however, I was given an 
additional appropriation, which made possible the employment of an 
assistant and an extension of the work. 
While the nursery and orchard police work still demands most of 
the time of both my assistant, Mr. W. F. Fiske, and myself, it was 
decided that between us we might trace out the life history of this 
new Aphid. Accordingly, on March 25, 1901, a plum tree in Atlanta, 
which I had noted the previous year as being badly infested with the 
lice, was examined just in time to find the newly issued to nearly full- 
grown larvee present. These had apparently hatched from over- 
wintering eggs, as evidenced by the presence near them of the dark- 
brown shells, and the five antennal joints that developed in the adult 
as against six joints in the adults of sueceeding generations. 
From these stem mothers, colonies were established both in the 
laboratories and in the open air on young plum trees grown from 
