Rau—O bservations on Samia Cecropia, Linn. 27 
longest lived fertilized female outlived the longest lived 
unfertilized female by 19 hours and 30 minutes. The 
shortest duration of entire life of fertilized female was 
6 days and 16 hours. The shortest duration of entire life 
of unfertilized female was 7 days and 30 minutes. The 
shortest lived unfertilized female outlived the shortest 
lived fertilized female by 8 hours and 30 minutes. The 
average duration of entire life of fertilized female was 
8 days 4 hours and 28 4/7 minutes. The average duration 
of entire life of unfertilized female was 8 days 7 1/2 min- 
utes. The average duration of life of fertilized female 
was greater than the average duration of life of unterti- 
lized female by 4 hours and 21 1/14 minutes. 
In the fertilized females notes were made in seven in- 
stances; in the unfertilized females notes were made in 
four instances. Were the number of observations equal 
in each case, no doubt the average duration of fertilized 
and of unfertilized female life would be about equal. 
(e) The duration of life of fertilized female from time 
when first observed in copulo until death. 
Notes derived from observations in twelve instances. 
KNOWN AS DAYS HOURS 
A 10a 8 0:30 
All 7 7 
A 4 7 0:30 
A 14 6 15:40 
A 9 6 6 
A 15 6 4 
A 10 6 0 
A 5 5 10 
Ao a 5 9 
A 12 5 0 
A 3 4 12:30 
A 8 4 0 
The greatest length of life of female from the time of 
copulo until death was 8 days and 30 minutes. The short- 
est length of life of female from the time of copulo until 
death was 4 days. The average duration of life of female 
from the time of copulo until death was 5 days 23 hours 
and 25 5/6 minutes. 
