38 THE SUGAR-BEET WIEEWOEM. 
soil was kept quite damp by additions of water from time to time. 
This cage presented very much the condition which ^'ould hold 
in the field if all the food could be eUminated. Five hundred 
and sixty beetles were used in this experiment, with the following 
results : 
About 60 died before 10 days. 
About 100 died before 10-15 days. 
About 200 died before 15-18 days. 
About ] 00 died before 18-22 days. 
About 60 died before 22-25 days. 
About 30 died before 25-28 days. 
About 6 died before 28-30 days. 
About 2 died before 30-31 days. 
About 1 lived for 34 days. 
One lived for 40 days. 
The last 10 to die were females. Their abdomens were quite 
swollen, but they did not lay any eggs — at least none could be 
found — and when they were dissected after death the ovaries, while 
containmg some eggs almost mature, were quite shrunken and dr}'. 
None of the beetles was very active after 15 days, and after 25 dhjs 
they were very feeble, the last few to die being unable to walk during 
the last days they lived. 
Many adults were separated and kept in xiols and given food but 
no water. Care was exercised to have this food as dry as possible. 
Out of 78 used in this experiment only 12 died during the fu^t 15 
days, and the remainder were quite active. It was so difficult to 
obtain the food dry enough to affect them that the experiment was 
discontinued. 
LEXGTH OF TIME ADULTS CAX BE SUBMERGED. 
Several adults were submerged in water m a tube and kept below 
the surface by a smaller tube placed within the first one. The 
water was perfectly clear and care was taken to remove all the air. 
At the end of 15 minutes the beetles had ceased to move and at the 
end of 20 minutes they were removed. They seemed dead, but within 
a few minutes were moving about actively and seemed none the worse 
for their treatment. 
Another lot was submerged for 40 minutes and within a half hour 
after being taken out were as active as ever. The tests were not 
carried further, as these were considered as severe as an}^ they would 
be subjected to under field conditions. Twenty adults were floated 
on water for 15 hours and at the end of that time onh^ three were 
dead. From these results it w^as concluded that a majority of the 
beetles could survive a severe storm. 
