302 Trans. Acad. Sci. of St. Louis. 



Experiment 57.— June 11, 8 :00 A. M. 



(J 180. One-half of each antenna removed. 

 9 149. 



Object. — To see if a male with only one-half of each 

 antenna remaining will mate. 



Results. — June 12. 8:00 A. M. In copulo. 



Experiment 58.— June 11, 11 :00 P. M. 



$ 187. Age day 10:00 hours. 



c^l82. Age 1 day 9:30 hours. Right antenna removed. 



Object. — Can this male with only one antenna mate 1 



Results. — June ]5. They have been left together for almost four 

 days without mating. 



Since we found soon after, that the female was good, 

 the cause of this was obviously the absence of the an- 

 tenna of the male. 



Experiment 59. — June 11, 11 :30 P. M. 



$ 191. Age day 8:00 hours. 



(^188. Age day 10:00 hours. Both antenna removed. 



Object. — To test a male's ability to mate without the 

 antennae. 



Results. — June 1'). After four days' opportunity, they have not 

 mated. 



A later experiment proved that the female was quite 

 capable of mating; hence we may safely assume the 

 cause of its failure to be the antennaless condition of 

 the male. 



Experiment 60. — June 12, 8 :00 A. M. 



9 153. Antennaless; used in two previous experiments before 



the removal of the antennae. 

 c?193. 



Object. — To find if the removal of the antennae of the 

 female will hinder mating. 



Results. — June 13, 8:00 A. M. The pair in copulo. 



