THE OUTBREAK OF 1907. 35 
badly infested; outside of these counties the infestation was slight. 
He received very few if any reports of its occurrence north of the 
Missouri River. It probably occurred in the northern part of the 
State also, as the bureau received a report, with specimens, of injury 
to oats at Weaver, Lee County, Iowa, and Mr. C. N. Ainslie found 
it occurring in small numbers at several points in northwestern Iowa. 
From reports received by this bureau it seems that Toxoptera was 
very abundant in northern Illinois, confining its injuries chiefly to 
oats. Mr. Edgar McGee, of Sciota, McDonough County, 111., sent us 
specimens July 5 which proved to be Toxoptera, and in a letter dated 
July 29 he stated that it was very widespread, that his and adjoining 
counties were badly infested, and that some fields of oats were so seri- 
ously injured that the owners had plowed them under and planted 
other crops. The yield in that locality, from Mr. McGee's report, 
seems to have been greatly reduced. 
At Sandwich, Dekalb County, 111., there was apparently consider- 
able damage to oats; no specimens were received; the injury in all 
probability was, however, due to Toxoptera. To quote from a letter 
from Mr. Clark Graves, bearing date of July 12: 
I have today mailed to you, under separate cover, a fair sample of the oats of this 
vicinity, and I think from general appearances that the crop will be shortened half 
on account of the green bug. The bugs have now disappeared, and it would seem that 
the late oats have suffered considerably more than the early ones. 
There were no specimens of plant-lice in this material from Mr. 
Graves. 
A report, with specimens, was received from Manteno, Kankakee 
County, 111., which stated that that section had suffered considerably 
from " green-bug" attack. 
We have only one record of serious injury from Indiana in 1907 
that can without doubt be attributed to Toxoptera. This was in a 
small field of oats just outside the limits of Indianapolis. The junior 
author examined this field and found that over an acre had been seri- 
ously affected, part of it being entirely destroyed. The " green bug" 
disappeared from the oats before the latter headed out, probably 
overcome by Aphidius and other enemies. This infestation appar- 
ently originated from rank bluegrass growing along one side of the 
field. Later in the season, when the oats had been harvested, Tox- 
optera could be found along this margin on the bluegrass, where the 
sexes appeared and eggs were produced. Toxoptera was found at 
other points in Indiana, but only in small numbers. 
Mr. T. H. Parks, of this bureau, states that in the latter part of 
June, 1907, the oats on his father's farm in Pickaway County, Ohio, 
were badly damaged by aphides. He states that parts of some fields 
in the neighborhood were scarcely worth cutting. Aphides were very 
abundant on the plants and parasitized aphides were very plentiful 
also. The oats plants that were badly infested turned brown, and 
