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. 



(c) TT&e duration of life of unfertilised females from 

 hatching until death. 



Notes derived from observations in four instances. 

 B is the conventional designation for the unfertilized 

 female. 



HOURS 



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 7 1/2 min- 

 utes. 



(d) Comparison of the entire duration of life of fertilized 

 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 



