- 36 - 
A summary of the county population estimates if' given "by States in the following 
table. 
State!/ 
Hibernation . 
medium 
Chinch bugs per square foot of 
hibernation medium— county averages 
Maximum ; Minimum 
Mean 
Illinois 
Andropogon furcatus and A. 
scoparius • 
Number • Number 
• 
4,25.2 4i 
Number 
1,072 
Indiana 
A, furcatus. A. scoparius. 
and timothy 
! 
1,115 j 4 
l60 
Iowa — 
A. furcatus and A. 
scoparius 
• 
28, 53.0 8 30 
>+.577 
Kansas 
do. 
: 
5.64o 1 46 
1.196 
Missouri . 
A. furcatus, A. scoparius, al- 
•so brooms edge, giant redtop, 
drops eed and Indian grass. ' 
• 
6,935 i >♦ 
8 
885 
Nebraska — i- 
A, furcatus and A. 
scoparius 
•3.SS3 ! 6 
1,526 
Ohio 
Timothy 
• 
1,120 6 
1 « 
164 
Oklahoma 
A, furcatus and A. 
s co par ius 
# 
• . } 
1,901 : 129 
890 
Including infested portions only. 
The area surveyed is shown on the accompanying map, which also indicates in 
a general way the density of chinch bug populations in hibernation at the begin- 
ning of the 1939-40 winter season. This map is to be regarded as indicating the 
possible maximum chinch bug menace for 19 4o. It should be understood, however, 
that the numbers' of chinch bugs now in hibernation may become greatly reduced by 
unfavorable weather conditions or other natural agencies during the ™inter, 
spring, or early summer, before the corn crop' of 19 40' becomes subjected to chine} 
bug attack. For this reason supplementary surveys arc planned, one in early 
spring to check up on winter mortality of the hibernating bugs, and one late in 
May and early in June to' determine the abundance of the spring brood in small 
grains and the probable extent and severity of its migrations to corn. 
