t 
184 
did not revive at all, while those remaining feebly crawled away 
in from twelve to twenty minutes. The fourth and fifth lots were 
immersed five and six hours respectively. Only two of the fourth 
lot revived after being left on the towel for half an hour, while 
none of the fifth ever moved a leg or antenna. From this it ap¬ 
pears that bugs of the first molt cannot withstand complete im¬ 
mersion longer than three to five hours. 
No. 3. live lots of the second molt were similarly immersed for 
four, five, six, seven, and eight hours respectively. All of the first 
two lots revived in from twelve to twenty minutes. Five of the third, 
ten of the fourth, and fifteen of the fifth lots were drowned, 
while the others crawled feebly about in from fourteen to twenty- 
two minutes. Two more lots were selected and immersed, one for 
nine hours and the other for ten. Only two of the sixth lot sur¬ 
vived the treatment, and all of the seventh lot succumbed and never 
moved after being taken out. From the above it appears that 
chinch-bugs of thesecond molt cannot withstand complete im¬ 
mersion longer than six to nine hours. 
No. 4. August 10, eight lots of the third molt, or pup^e, were 
immersed for seven, eight, nine, ten, eleven, twelve, thirteen, and 
fourteen hours. All those of the first lot and all except seven in 
the second revived in from twelve to thirty minutes; eleven in 
the third lot did not recover; and twelve, or two thirds, of those 
in the fourth lot were dead when removed, showing no signs of 
life after remaining on the dry towel for one hour. In the fifth 
and sixth lots there was a reversion of things. Eight of the fifth 
lot and nine of the sixth survived the immersion and crawded 
away. I cannot explain this difference, unless there was a grealer 
amount of air accumulated on the under surface of the cotton in 
their immersion bottle than in the others. I have noticed that 
when there was a bubble of air attached to a bug, or to several, 
they would struggle much longer than the others in the same bot¬ 
tle free from such bubbles. Fifteen of those in the seventh lot 
and all of those in the eighth were dead when removed. From 
this it appears that the pupae are extremely variable, and that 
they will often survive eight to thirteen hours’ immersion. 
The six pupae that survived the ten-hour immersion were placed 
in a two-ounce wide-mouth bottle and corked up tightly wuthout 
food. Three adults emerged August 13, and one other emerged 
.August 20. August 27 one adult and one pupa died, and the others- 
died two days later, having lived nineteen days in this cell with¬ 
out food, and without air except that w r hich was corked up in the 
bottle. 
No. 5. August 11 and 12, ten lots of recently molted adults 
were immersed eight, ten, twelve, fourteen, sixteen, eighteen, twenty, 
twenty-two, twenty-four, and twenty-six hours. All the insects in 
the various lots were removed from their respective cages and 
placed on towels until they were dry. Each lot was then placed 
in a four-ounce wide-mouth bottle w T hich w’as afterward* plugged 
with cotton, numbered, and laid on a table, where they were 
observed. All the insects in the eight- and ten-hour lots revived 
in twenty to forty minutes and moved about in the bottles at a 
lively rate; all but two in the twelve-hour lot, and all but two in 
