26 Trans. Acad. Sci. of St. Louis. 
older. In each of the twelve copulating pairs the males 
always outlived their mates. The figures below are only 
for those upon which the exact time of hatching is known. 
KNOWN AS DAYS HOURS 
A 8 35 5:30 younger than 9° 
3 lived 6 9:30 longer. 
A 9 or 1 older than 2 
male escaped. 
A 10 A 2 0:30 older than 2 
3 lived 1 0:30 longer. 
A 108 32 0:30 older than 92 
3 lived 0 12:30 longer. 
A 12 Jl 15:30 younger than 2 
3 lived 4 0:30 longer. 
A 14 3 0 20 younger than 2 
. 6 lived 3 1:50 longer. 
A 15 3} 90 0:20 younger than 2 
Jd lived 0 21 longer. 
(c) The duration of life of unfertilized females from 
hatching until death. 
Notes derived from observations in four instances. 
B is the conventional designation for the unfertilized 
female. 
KNOWN AS DAYS HOURS 
B 2a 9 
B la 8 
Bl 8 
B5 7 0:30 
The shortest duration of life of the unfertilized female 
was 7 days and 30 minutes. The longest duration of life 
of unfertilized female was 9 days. The average dura- 
tion of life of unfertilized female was 8 days 71/2 min- 
utes. 
(d) Comparison of the entire duration of life of fertuhzed 
and unfertilized female. 
The longest duration of entire life of fertilized female 
was 9 days 19 hours and 30 minutes. The longest dura- 
tion of entire life of unfertilized female was 9 days. The 
