In July of tlie same jeav specimens of this Aphid began to be sent 

 to the office as being injurions to the nursery stock, and the fall nur- 

 sery inspection sliowed it to be a serious pest in the nurseries, particu- 

 larly on June-budded peach trees. The terminals are attacked earl}^ 

 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 ncAV species of the genus Aphis. (This information was 

 accompanied by the statement, "I think it well worth your while to 

 make a careful study of this insect.") 



San Jose scale 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 newl}^ issued to nearly full- 

 grown larv?e 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 succeeding generations. 



From these stem mothers, colonies were established both in the 

 laboratories and in the open air on young plum trees grown from 



