310 Trans. Acad. Sci. of St. Louis. 



remated three times. The female died and the male 

 continued in copulo with the dead body for about seven 

 hours. 



2. THE SPECIES SEEM TO BE MONOGAMOUS. 



In my work of the previous year I found it impossible 

 to mate one male with more than one female, or vice 

 versa. After reading that in Miss Soule's^ experience 

 a* * * eleven males mated * * * and then mated 

 a second female each eight hours later, ^ ' I gave each in- 

 sect, wherever possible, the opportunity to mate a sec- 

 ond time either with the original mate or with another, 

 which, in some cases, was yet unmated and in others had 

 been previously mated. As a result of these experiments 

 I found the species to be monogamous, that is, each male 

 mating with but one female, and each female mating 

 with one male, with but the following exceptions: 



3 males mated with the original female 2 times. 



1 male mated with the original female 3 times. 



2 males mated with the original female 4 times. 

 1 male mated with the original female 5 times. 



These are simple rematings. The following are the 

 only cases of true polygamy: 



1 female mated with 2 males 1 time each. 



3 males mated with 2 females 1 time each. 

 1 male mated with 3 females 1 time each. 



Whenever cases of true polygamy occurred, the later 

 mating was always with an individual which was still 

 unmated and very young, and in almost every case it 

 was only when the new insect was placed in the cage just 

 a few hours after the first mating had terminated.^ 



' Psyche, 9 : 224. 



« The exact number of opportunities given the pairs to remate was 58. 

 Besides this, upwards of 100 experiments were made to see if mated 

 individuals would again mate with unmated ones or with others already 

 mated. 



