40 
reared from grass roots and allowed to colonize on Cornus leaf there are 
the full number common to corni and show distinctly. Mr. Oestiund’s 
statement that they are indistinct and but three or four in number 
might, I think, apply to an extreme variation or to specimens fresh from 
the ground. The dark spot on the dorsum of the abdomen is not only 
variable in size but differs much in appearance with the age of the speci- 
men and in dead or preserved specimens. While I am free to admit 
some puzzling questions, I am strongly convinced of the main point here 
claimed. There is certainly much more of interest to be learned re- 
garding the species. I feel that only a beginning has been made, and 
shall watch eagerly for further developments. As the Aphides are so 
uncertain in their appearances and can not be depended upon to fur- 
nish material in abundance in every locality, it will add to the certainty 
of completing the history of this species if entomologists in various 
localities will make such observations as possible the coming season. 
If my conclusions are correct the synonomy for this species will read 
as follows 
(1794) Aphis corni Fabricius, Ent. Syst., IV, 214 
(1860) Schizoneura venusta Passerini, Gli Afidi, p. 38. 
(1862) Eriosoma? fungicola Walsh, Proc. Ent. Soc. Phila., I, 304. 
(1862) Eriosoma? cornicola Walsh, Proc. Ent. Soc. Phila., I, 304. 
(1879) Schizoneura panicola Thos., 8th Rep. Ill. Ent., p. 138. 
SUMMARY. 
Schizoneure abundant on grass roots and assuming winged form in 
latter part of September (15-28) and on several days during this time the 
air was filled with like insects, and immediately following these flights 
apparently identical Aphides were colonizing on leaves of dogwood, 
which had hitherto been free from them. 
Schizoneura (winged pseudogyne) reared from grass roots and trans- 
ferred to leaves of Cornus established colonies apparently identical with 
those occurring normally on Cornus. | 
Schizoneura (apterous individuals) in some number remain on grass 
roots and are associated with apterous males and females, the femaies 
of which are oviparous. 
Individuals of these different forms agree with each other and with 
descriptions of both corni and panicola and differences do not exceed 
the range of variation common to species of Aphididi. 
CONCLUSION. 
Taking all these facts into consideration, I believe that the species of 
Schizoneura infesting grass roots and dogwood leaves and described as 
distinet species are identical. 
That the winged generation of asexual individuals produced from 
grass roots in autumn migrate to leaves of dogwood of different species 
and establish colonies of apterous individuals, which become sexually 
mature and the females of which deposit eggs on dogwood. 
