Rau — Observations on Samia Cecropia, Linn. 27 



longest lived fertilized female outlived the longest lived 

 unfertilized female by 19 hours and 30 minutes. The 

 shortest duration of entire life of fertilized female was 

 6 days and 16 hours. The shortest duration of entire life 

 of unfertilized female was 7 days and 30 minutes. The 

 shortest lived unfertilized female outlived the shortest 

 lived fertilized female by 8 hours and 30 minutes. The 

 average duration of entire life of fertilized female was 

 8 days 4 hours and 28 4/7 minutes. The average duration 

 of entire life of unfertilized female was 8 days 7 1/2 min- 

 utes. The average duration of life of fertilized female 

 was greater than the average duration of life of unferti- 

 lized female by 4 hours and 21 1/14 minutes. 



In the fertilized females notes were made in seven in- 

 stances; in the unfertilized females notes were made in 

 four instances. Were the number of observations equal 

 in each case, no doubt the average duration of fertilized 

 and of unfertilized female life would be about equal. 



(e) The duration of life of fertilized female from time 

 when first observed in copido until death. 

 Notes derived from observations in twelve instances. 



The greatest length of life of female from the time of 

 copulo until death was 8 days and 30 minutes. The short- 

 est length of life of female from the time of copulo until 

 death was 4 days. The average duration of life of female 

 from the time of copulo until death was 5 days 23 hours 

 and 25 5/6 minutes. 



