THE OUTBREAK OF 1907. 33 
From here the junior author made a trip into northwestern and north- 
eastern Kansas and south-central Nebraska to determine the north- 
ern limit of destructive infestation. The following places were 
visited: Solomon, Dickinson County, Kans. ; Beloit, Mitchell County, 
Kans. ; Lenora, Norton County, Kans. ; and Kearney, Buffalo County, 
Nebr. The infestation at all of these places was very slight and no 
damage was done. At two places only, Solomon and Beloit, were 
parasites found. 
The senior author in the meantime proceeded to Great Bend, 
Barton County; Dodge City, Ford County; Garden City, Finney 
County; and Syracuse, Hamilton County — all in Kansas. The 
object of this trip was to see how far Toxoptera had spread to the 
westward. It was found at all of the above points, doing consid- 
erable injury; at Syracuse an unirrigated field of oats of 10 acres was 
found bordering an irrigation ditch. Along this ditch was a ragged 
border from 10 to 30 or 40 feet in width of vigorously growing oats 
where the "green bug" had apparently done no injury, while beyond 
this border, where the moisture from the ditch had not penetrated, 
the loss was total. In another case in the same locality, a part of the 
wheat in an unirrigated field came up in the fall and the rest not 
until the following spring; the former was uninjured by "green 
bugs/' while the latter was killed. From Syracuse the senior author 
proceeded to Wellington, Kans., to join Mr. Ainslie. 
In a letter dated June 5, 1907, Prof. C. P. Gillette states that he 
made a trip into the Arkansas valley early in the spring and found 
Toxoptera doing very serious injury to wheat fields; to such an 
extent was this the case that he advised some of the farmers to plow 
up some of their fields and plant other crops. Following this trip 
there was a heavy snowstorm and the "green bugs" were greatly 
diminished in numbers, though at the date of his writing (June 5) 
Toxoptera was abundant in the fields. 
On July 9 Prof. Gillette sent us badly parasitized Toxoptera on 
blue grass from Fort Collins, Colo., with the statement that the " green 
bug" had largely disappeared from the grain fields in that locality. 
Mr. Ainslie remained in the vicinity of Wellington, Kans., from the 
last week of April to the 21st of May, at which date he was joined by 
the senior author and went south to Kingfisher, Okla. The condi- 
tions found there were serious in the extreme, most of the grain 
fields being bare and many had been plowed and displaced by other 
crops. Between Wellington, Kans., and Kingfisher, Okla., a strip of 
country was encountered by them about 30 miles in width, beginning 
above Medford, Okla., with Pond Creek about midway between, 
and extending almost to Kremlin, Okla., over which the injury from 
Toxoptera was not nearly so great as in the country both to the 
26675°— Bull. 110—12 3 
