94 Trans. Acad. Sci. of St. Louis. 
The greatest duration of life of male from the termina- 
tion of copulation until death was A 5, 12 days 1 hour and 
30 minutes. The shortest duration of such life was A 10, 
6 days 1 hour. The average duration of life of male from 
the termination of copulation until death was 9 days and 
42 minutes. | 
In the face of Weismann’s theory that the duration of 
life is an adaptation, and finding the species to be monag- 
amous, we should expect them to die very soon after 
leaving the female, instead of spending a useless life of 
from 6 to 12 days, as the foregoing figures show. It may 
be of interest to here state that the longest useless life is 
found in A 5, being 12 days 1 hour and 30 minutes, while 
the useful life of its mate, as I shall show later, was cut 
short before she had time to deposit her remaining 112 
eggs. 
(d) On the length of time each male outhved its mate. 
Notes derived from observations in ten instances. 
KNOWN AS DAYS HOURS. 
A 3 8 11 
A 5 7 15:30 
A 8 6 9:30 
A 12 4 0:30 
A 14 3 1:50 
A 4 3 0 
A lil 2 18 
A 10 1 0:30 
A 15 0 21 
A 10a 0 12:30 
In A 3 we find the male to have outlived its mate by 8 
days 11 hours. This, however, was the longest period. 
The shortest length of time that any male survived its 
mate was A 10?, 12 hours and 30 minutes. Perhaps the 
shortness of the life of the male A 10* was due to the 
fact that the two pairs A 10 and A 10° were placed to- 
gether. 
The ten males survived their mates on the average 
by 3 days 18 hours and 38 minutes. 
