Rail — Sexual Selection Experiments in Cecropia Moth. 293 

 Experiment 25.— May 9, 10 :30 P. M. 



(^89. Age day 10:15 hours. Large. 



9 SI. Age 7 days 5:32 hours. Wings slightly damaged. 



$ 93. Age day 9:00 hours. 



Object. — Will the male mate with the old or young- 

 female ? 



Results. — Death after two weeks without mating. 



Experiment 26.— May 9, 10:30 P. M. 



$ 90. Age day 9:45 hours. 



9 94. Age day 8:50 hours. Wings slightly crumpled, due 



perhaps to having been inflated in close quarters. 

 c?33. Age 10 days 9:30 hours. 



Object. — Can so old a male mate, and if so, will he 

 select the female with the defective wings or the one in 

 perfect physical condition 1 



Results. — May 15. Death of male 33. The insects have been kept 

 together 6 days without mating. 



Experiment 27.— May 9, 10 :30 P. M. 



(^23. Age 11 days 6:50 hours. Wings badly worn. 

 (5* 15. Age 11 days 9:43 hours. 

 2 92. Age day 9:43 hours. 



Object. — To see which of the males of practically equal 

 age will be chosen or will be victorious — the perfect insect 

 or the one with ragged wings. 



Results. — May 10. No mating. Male 5, now over 16 days old, is 

 added. — May 11, 8:00 A. M. Still no mating. The three males are 

 exchanged for a stray male 111. — May 12, 8:00 A. M. The pair found 

 in copulo. 



Evidently the three males had lost their vitalit}^ 

 through old age, for it seems improbable that the female 

 rejected them all and "waited" for a younger one. It 

 will be remembered that none of these had ever mated. 



Experiment 28.— May 12, 11 :00 A. M. 



9 106. Age 1 day 20:30 hours. 

 9 98. Age 2 days 20:00 hours. 



^ 97. Age 2 days 21:00 hours. Left off mating 3 hours pre- 

 viously. 



