1 S THE CHINCH BUG. 
-hock by heavy rain- became covered with water that stood over 
n long enough for a sheet of ice to form. When the water had sub- 
sided the corn was husked and a uumber of chinch bugs were found 
among the car-, where they had been immersed for a week- or more; 
yei on being exposed to the warm sun they began to crawl about in 
a lively manner. 
The .Maine Agricultural Experiment Station some year- ago" ear- 
ned out a -eric- of experiments with the maritime form to determine 
the effect of freezing. Ten long-winged ami 6 short-winged bugs 
were frozen in an open box for fifteen hour-. Upon thawing out '1 
gave no signs of life. After being kept for nine hour- at a tempera- 
ture of 65 the 1 1 surviving bugs were refrozen for fifteen hours and 
then thawed out. when '> long-winged and 3 short-winged revived. 
After nine hours at a temperature of 65° they were fro/en a third 
time for fifteen hour.-, during which time the minimum temperature 
sank to 1G° below zero. When thawed out all revived, but during 
the following nine hours at 65° temperature the 3 short-winged bugs 
and '2 of the loner-winged one- died. The remaining 3 long-winged 
were then frozen a fourth time' for fifteen hours, after which none 
re\ ived. 
In summarizing the results of these experiments. 25 in number, 
it was found that complete submersion in water, even for a considera- 
ble period, is not necessarily fatal. Freezing during submersion in 
water i- almost surely fatal. Freezing while exposed to dry atmos- 
phere i- generally fatal. Freezing in a moisture-laden atmosphere 
is only occasionally fatal. It will be observed, however, that not all 
of these results would necessarily follow corresponding experiments 
with the inland long-winged form. 
SPRING, SUMMER, AND AUTUMN MIGRATIONS. 
If there is an ample supply of proper food close at hand the chinch 
hug -imply crawl- from it- hibernating place, hut if it is in the timo- 
thy meadows of northeastern Ohio it does nothing but continue it> 
ravages where it left off the autumn before, except some of the 
long-winged form, which very evidently fly to the wheat and corn 
fields. In wheat lields — unless the migration has been from an ad- 
joining field, in which case the attack i- made along the edge nearest 
thereto -the females do not seem to forsake their gregarious habits 
entirely, a- they do Dot scatter out evenly over the entire field, hut ap-" 
pear to locate in colonies, and when the young hatch and begin to attack 
the growing grain their presence is first disclosed by small whitening 
patches, which increase in dimensions a- the young heroine older and 
more numerous. In low-lying fields these whitening patches more 
Nineteenth Rept .Main- Agric. Exp. Sta., L903, p. 48. 
