50 PAPERS ON CEREAL AND FORAGE INSECTS. 
most rapid development of the fungus appeared in cages where the 
bugs had little or no food. In the stock cages only a very small 
supply of the fungus could be secured until the food was removed, 
when it soon appeared abundantly upon their dead bodies lying on 
the soil. 
ConcLustons.—From these experiments it is apparent that Sporo- 
trichum globuliferum will to a certain extent develop entirely upon the 
dead bodies of adult chinch bugs. However, the fungus was easily 
secured in the cages containing living bugs artificially moculated, 
particularly when the bugs in these cages were given insufficient food 
supply. 
The indications were also that this fungus is communicable to 
living chinch bugs, but is evidently not very effective in causing their 
death unless the bugs possess weakened vitality. This being the 
case, it would be most effective in nature against old spent adults 
which have laid their eggs and are comparatively harmless, and it is 
upon these bugs that the fungus always appeared in greatest abun- 
dance, as borne out by field observations during the past three years. 
For this reason, as well as its dependence upon favorable weather 
conditions, its practical efficiency is very questionable; and since it is 
unable under favorable conditions of moisture and temperature to 
rapidly exterminate healthy bugs confined in a cage in the laboratory, 
little dependence can be put upon it to be used against the insects in 
the field when favorable moisture conditions are so apt to be lacking. 
SUMMARY. 
Injuries due to the chinch bug west of the Mississippi River are 
chiefly confined to the States east of the Rocky Mountains where 
wheat and corn are extensively grown, the most serious outbreaks 
during 1909 and 1910 occurring in southern Kansas and northern 
Oklahoma. 
There are two generations each year, one during the spring, which 
attacks the wheat and corn, and one during the summer, which develops 
on the corn and hibernates. These last pass the winter as adults, and 
in the States west of the Mississippi River prefer for hibernation the 
dense clumps of red sedge grass in which they collect in the fall. 
Very few survive the winter in fallen ears or stalks of corn during 
severe cold winters, but may survive a mild winter. They fly from 
the sedge grass to fields of wheat during the first warm days of spring, 
where the eggs are deposited, and the young hatching therefrom feed 
with the adults upon the wheat until it has ripened, when they all 
march in a body to the nearest cornfield. The young become mature 
on the corn and lay eggs from which hatch the bugs that winter over 
as above stated. Weather conditions have much to do with the 
