58 
Mariana cuttings and also on peach seedlings. Isolated colonies on 
the original plum tree were also watched. 
In some colonies when members of the fifth generation reached 
maturity, on May 8, winged individuals developed, while in other 
colonies the winged form did not appear until the sixth and seventh 
generations were reached. Our field notes show that the winged 
form appeared in south Georgia as early as April 18, and, indeed, 
winged individuals were found in great numbers in Atlanta on a plum 
tree that was not at first under observation as early as May 1. 
All forms that have been observed to the present date are partheno- 
genetic. Only a small percentage of a colony would become winged, 
but winged individuals have continued to develop in every generation 
until the present date (August 14). 
After about twenty-four hours 
from maturity the winged individ- 
uals leave the colony and estab- 
lish themselves, either singly or 
in groups of two or three, upon 
neighboring trees, where they feed 
for several hours before giving birth 
to young. The terminals of succu- 
lent shoots were invariably selected, 
and the peach seemed to be pre- 
ferred to the plum; in fact, the 
winged were never observed to 
locate on the plum, although sey- 
eral plum trees were growing on the 
grounds. 
It was never observed that the 
direct offspring of the winged form 
Fic. 3—Aphis n. sp: adult from winged developed wings, but some individ- 
form, much enlarged (from drawing fur- qyals of the second and) suecceamm 
nished by Scott). A 
generations usually do so. 
It was also observed that when a colony was kept reduced to a 
small number of individuals no winged individuals would develop, 
but when allowed to increase to considerable numbers some such 
would always appear. 
On August 14 some of the colonies had been carried to the tenth 
generation from the winged. 
In order to get further assurance that an old species was not under 
observation, specimens were taken from one of the breeding numbers 
and submitted to Mr. Pergande, who again identified the insect as a 
new species of the genus Aphis. 
It is desired to carry this breeding work on until the true males and 
females are secured before describing the species. 
Adalia bipunctata frequented our breeding colonies in great num- 
