BIOLOGY OF THE MEXICAN COTTON BOLL WEEVIL. 43 
in the hibernation cages on November 15 was followed in order of 
total emergence by the survival of weevils placed in the cages No- 
vember 1 and December 1, respectively. 
TABLE XXI.—Summary of hibernation of Anthonomus grandis under ali con- 
ditions—winter 1918-19. 
Open field. On ground in woods.| In treesin woods. 
oe ncaa Prasat 
“7 per- 
bes Number Per Number Per Number Per- sane cent- 
Date ae emerged. cent- emerged. cent- | emerged. | cent- ; age 
started. vils age age age surviv- 
placed surviv- surviv- surviv- Ing 
in |v Fe- | ins M ye || eS M Fe- | ine 1 eed toes 
cages, | Males.| wales. Sa ales.| males a ales. males baa Males. | males. ; 
1918 
Oct. 1. .-| 3,000 1 1 0.2 4 4 0.8 0 0 0 5 5 0.3 
Oct. 16. .| 3,000 17 21 3.8 19 22 4.1 33 27 60 69 70 4.6 
Nov. 1..-.} 3, 000 23 22 4.5 115 81 | 19.6 20 18 3.8 158 121 9.3 
Nov. 15..| 3, 000 68 59 | 12.7 113 94°) 20/7 60 42} 10.2 241 195 14.5 
Ce al 100 14 9 7.6 30 27 | 19.0 6 5 2.7 50 41 9.0 
Total. .|13, 100 123 DTU eveteve 281 IPAS \eanoe 119 OO a seas 523 CRAM eceHe 
PAL arenes | crete 24.6 | 22.4] 5.76] 56.2; 45.6] 12.8] 23.8] 18.4] 15.34] 104.6] 86.4 7.54 
Max sail etsctevtaye 68 59 | 12.7 115 94 | 20.7 60 42 60 241 195 14.5 
Minty She. come: 1 1 0.2 4 4 0.8 6 5) 0 5 5 0.3 
GENERAL SUMMARY. 
At Madison, Fla., the average longevity of hibernated weevils 
without food was 12.7 days, and 18.8 days when fed on cotton plant- 
lets. Adult weevils of the first and second generations lived 24.3 days 
on cotton squares and 12.3 days on cotton bolls. 
On sea-island cotton plantlets the hibernated weevils lived 11.05 
days. The first and second generation weevils fed on sea-island cot- 
ton squares lived 10.7 days, while the weevils fed on sea-island cotton 
bolls lived only 15.3 days. 
There is practically no difference in the longevity of boll weevils 
on sea-island and upland cottons. 
The average period from the time the weevils become adult to 
oviposition at Madison, Fla., for all experiments, was 8.9 days for 
weevils bred under insectary conditions and 7.07 days for weevils 
bred under field conditions. 
The average period of oviposition under insectary conditions for 
all weevils under observation on upland cotton was 33.1 days. The 
entire series deposited eggs over an average period of 31.7 days 
on sea-island cotton. The largest number of eggs deposited by a 
single female weevil was 432. This record was made by a hibernated 
female on upland cotton squares under insectary conditions. The 
largest number of eggs deposited during any one day under insectary 
conditions was 25. This record was also made by a hibernated female 
weevil. 
