BIOLOGY OF THE MEXICAN COTTON BOLL WEEVIL. ial 
LOCATIONS SELECTED FOR OVIPOSITION ON SEA-ISLAND AND 
UPLAND COTTON SQUARES. 
Upland cotton squares are usually punctured at the base of the 
square, as is shown in Plate I, figure 2.. During the writer’s studies 
at Thomasville, Ga., in 1916, the majority of the punctures were 
observed, in the case of sea-island cotton, to be on the upper portion 
of the square. There is little proliferation around the weevil punc- 
tures on the sea-island squares, the punctures being mere specks as 
compared to those on upland cotton. This characteristic location for 
egg deposition is shown in Plate I, figure 1. 
PERIOD FROM EMERGENCE TO OVIPOSITION. 
Female weevils bred in the outdoor insectary required an average 
period of 8.9 days from the time they became adult to the date of 
oviposition. ‘The period of time from emergence to oviposition 
varied from 6 to 20 days for weevils bred under insectary condi- 
tions. 
Boll weevils bred under normal field conditions appeared to have 
more vitality than weevils bred under insectary conditions. A 
record of 38 first-generation weevils bred under normal field condi- 
tions gave an average period of 7.07 days from the time they became 
adult to the date of oviposition. 
OVIPOSITION PERIOD OF THE BOLL WEEVIL UNDER INSECTARY 
CONDITIONS. 
The oviposition records for the weevil on upland cotton are pre- 
sented in Table V. Hibernated female weevils kept with male 
weevils throughout hfe deposited eggs over an average period of 
35.9 days compared with an average period of 21.7 days for females 
that were not kept with male weevils. The hibernated fertilized 
and nonfertilized weevils deposited a total of 3,605 eggs or an average 
of 7.2 eggs per day per female. During the lifetime of both series 
of hibernated weevils an average of 171 eggs was deposited by each 
female. The greatest number of eggs deposited during any one day 
by a single hibernated female weevil, under insectary conditions, was 
20. ‘The heaviest oviposition during the lifetime of both series of 
weevils was from the fifth to twenty-fifth days (fig. 4). The first- 
generation weevils deposited eggs for a period of 39.7 days and the 
second generation over a period of 35.2 days. The average period 
of oviposition on upland cotton for all weevils under observation was 
33.1 days. The relationship between the mean daily temperature and 
the mean daily oviposition of the hibernated weevils is shown to cor- 
