Rau—O bservations on Samia Cecropia, Linn. 25 
2. DURATION OF LIFE OF FEMALE, 
(a) The duration of life of fertilized female from hatch- 
ing until death. | 
Notes derived from observations in seven instances. 
KNOWN AS DAYS HOURS 
A 8 9 19:30 
A 9 9 4:30 
A 108 8 16:30 
Al4 a 21:50 
Al5 7 18 
A 12 7 ‘3 
A 10 6 16 
In A 8 we have the longest duration of entire life of 
female, 9 days 19 hours and 30 minutes. In A 10 we 
have the shortest duration of entire life of the female, 
6 days and 16 hours. The average entire dura- 
tion of life of female was 8 days 4 hours and 28 4/7 
minutes. 
(b) Comparison of entire life of male and female. 
The duration of shortest lived male was 8 days 14 hours 
and 40 minutes. The duration of shortest lived female 
was 6 days and 16 hours. The shortest lived male out- 
lived the shortest lived female by 1 day 22 hours and 40 
minutes. The longest duration of life of female was 9 
days 19 hours and 30 minutes. The longest duration of 
life of male was 11 days 5 hours and 30 minutes. The 
longest lived male outlived the longest lived female by 
1 day and 10 hours. The average duration of life of 
male over the average duration of life of female was 1 
day 20 hours and 58 2/21 minutes. 
Without exception, in each copulating pair we find the 
male to have outlived its mate, regardless of age at the 
time of copulating. One is apt to suspect that the males 
outlived their mates because they may have been younger 
at the time of mating, but the figures given below will 
show that the males survive the females whether both be 
of equal age or whether the females be younger or 
