26 



Trans. Acad. Sd. 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) 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. 



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 



