24 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 outlived its mate. 

 Notes derived from observations in ten instances. 



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 a , 12 hours and 30 minutes. Perhaps the 

 shortness of the life of the male A 10 a was due to the 

 fact that the two pairs A 10 and A 10 3 were placed to- 

 gether. 



The ten males survived their mates on the average 

 by 3 days 18 hours and 38 minutes. 



