SEASONAL HISTORY. 
33 
The summary of these records (Table VIII) shows that the female 
beetles on an average, not individually, survived the males by 4 day-. 
Table VIII. — Summary of the length of life of individual male and female beetles of 
Table VII. 
Sex. 
Average. 
Maximum. 
Minimum. 
Male 
Day a. 
32.1 
Day*. 
54 
Days. 
1 
Female 
36.4 
m 
21 
The maximum length of life for the males was 54 days, while that 
for the females was 60 days. In Table V is given further a summary 
of the length of life of the beetles in the stock jars, where no separate 
record has been made as to life of male and female individuals. 
THE EGG. 
IXCUBATIOX PERIOD OF THE EGG. 
The time necessary for the hatching of the eggs depends largely 
upon the prevailing temperature and probably also upon moisture 
conditions. Experiments to test the effective limits of these influ- 
ences have not been made, but the results of these factors Lave been 
in a general way well marked as is evident from the difference in the 
time of hatching of individual egg clusters throughout the season 
(see Table IX). In different sections of vineyards the hatching 
probably varies slightly, since some eggs are located in well shaded 
places, while others are so situated as to receive more heat from the 
sunlight. In the middle of the hatching period eggs which were kept 
in an open outdoor shelter hatched, on an average, in 12 days. The 
rate for hatching for the entire egg period is shown in Table IX. 
51282°— Bull. 89—10 3 
