Rail — Sexual Selection Experiments in Cecropia Moth. 297 



If the male finds the female by means of the antennae, 

 the younger but mutilated one will be unable to mate. 



Results. — June 7. The female found in copulo with, the older but 

 normal male. 



It appears that the antennaless male may be unable 

 to find the female. 



Experiment 39. — June 6, 9 :35 P. M. 



o 162. Age day 4:35 hours. 

 c5' 157. Age day 7:35 hours. 

 c^l41. Age 5 days 6:25 hours. 



Object. — To ascertain whether the older or the younger 

 male, of like condition, will win the female. 



Results.— June 7, 9:00 A. M. The female found mated with male 

 157, the younger. 



Experiment 40. — June 6, 10 :00 P. M. 



(j'lSS. Age 7 days 6:00 hours. Mated 5 days previously. 

 c^l61. Age 1 day 7:00 hours. Antennae removed. 

 5 151. Age 1 day 7:00 hours. 



Object. — To see if the female will mate with the young, 

 antennaless male or a normal mated insect 6 days older. 



Results.— June 9, 8:00 A. M. After three nights together they 

 have not mated. There is no reason apparent other than that the 

 antennaless male cannot mate, and the other is too old.° 



Experiment 41. — June 6, 10 :30 P. M. 



9 152. Age 1 day 7:20 hours. 

 0^143. Age 2 days 7:00 hours. 

 (5" 154. Age 1 day 6:00 hours. Wings removed. 



Object. — To see if the female will mate with the wing- 

 less male or the normal, older one. 



Results. — June 7. The female found mated with the young wing- 

 less male. 



'A later experiment proved that the female was not the one at 

 fault. This was also true in Experiments 24, 44, 66, 67, 68 and 69. 



