-lofi- 
be futile for the reasons already stated with reference te individual 1 - 
square-foot samples, and the results are therefore net reported here. About 
all that can he said for the 20 replications in this experiment is that, al- 
though they varied greatly among themselves, they all showed infestations far 
above the level of 15 per square foot, established by the Illinois workers 
as indicative of abundant infestation. Assuming bugs present in the 1-square- 
foot samples to be double the number in the l/5-square-f oot samples, for 
reasons already explained, this experiment indicates the presence of about 
280 bugs per square foot of bunch grass in the most favorable locations in 
Tipoecanoe County. 
Averaging the sets of 20 l/5-square-foot samples taken from each area 
indicated considerable variation in abundance of hibernating bugs in different 
parts of the county, as would be expected from the topography, which ranges 
from natural prairie with black soil, much corn, and bunch grass, to broken, 
more or less wooded country with more uncultivated land, gravelly or clay 
soil, more varied crops, less corn, and less bunch grass. The infestations 
by area were as follows: 
Area 
Type 
Favored grasses 
Bugs per l/n so. ft 
Northwest 
West C antral-- 
Southwest 
North Central- 
Central — 
South Central- 
Northeast 
East Central- 
Southeast 
Prairie 
Mixed 
do. 
do. 
. do. 
do. 
Broken 
do. 
Mixed 
Abundant 
• Common 
do. 
do. 
do. 
do. 
Scarce 
do. 
Common 
Numb e r 
393 
9 u 
136 
132 
157 
8U 
63 
126 
7U 
Surveys of Other Counties and Comparative Abundance of Bugs in Different 
Media , 
In addition to the replicated hibernation survey in Tippecanoe County, 
single surveys were made in the three neighboring counties covered last fall 
while the bugs were still in the cornfields. At least one l/5-square-f oot 
sample was taken from each ninth of a county and from each medium used. More 
than one set of samples of certain media were taken in some counties, for 
cne reason or another, but all samples of each medium are combined in the 
following averages. One-square-f oct samples were taken of the woodland types 
of cover, the results being divided by five for entry in the following table 
of results in terms of bugs per 1/5 square foot. 
