HANCOCK 177 



terial immediately behind her, but as she progressed she reached fartlierand 

 farther back as far as the whole length of the extended leg to get the par- 

 ticles. The specimen was quite short. She chose the black muck in which 

 to bury her eggs. June 2g, 1898. 



TETTIX TRIANGULARIS OVIPOSITING LAST OY JUNE. 



At ten minutes past ten o'clock p. m. I witnessed a specimen of Tettix 

 triangularis oviposit. This specimen has broken a period of recent 

 quiescence of egg-laying. The weather is torrid. June 29, 1898. 



TETTIX TRIANGULARIS LIVING TWO MONTHS IN VIVARIUM. 



Two female Tettix triangularis, taken May 7, died after living two 

 months in vivarium jars. July 6, 1898. 



LARV^ FOUND IN JUNE UNDERGONE THREE MOLTS. 



Searching a swampy stretch of grassy ground which was abundantly 

 mixed with moss, I found a number of Tettix about the same stage of 

 growth as a brood which has gone through the third molt in my vivarium. 

 An adult triangularis was found here. This year, I infer from these and 

 other observations, Tettix laid their eggs in nature in May. Observation 

 made in a swampy meadow at Chicago, June 26, 1898. 



EXPERIMENTAL EVIDENCE OF POLYANDRY SUGGESTING 

 THE TRANSMISSION OF MANY LINES OF DESCENT 

 THROUGH THE MALE. 



The author introduced a female Tettix gibbosus into one of his viva- 

 rium jars in which were three males of the same species. One of the 

 males almost at once detected the new arrival. Presently moving over to 

 where she was, and without interference, coitus took place, the sexes re- 

 maining together but a few moments, when the male left her. In five min- 

 utes another male came over to where she was feeding, making the usual 

 advances, jumping on her back and trying twice to effect conjugation, but 

 each time she shook her body vigorously. When the male tried to place 

 his abdomen down close beside hers, she refused to separate the hind fem- 

 ora on that side, an act necessary for the union of the sexes. Failing in 

 this, he jumped from her back, walked about an inch away, only to return 

 again a moment later. This time when he came back she received him. In 

 a few minutes another male, the third in the order named, appeared on the 

 scene, displacing the second, and succeeded also in sexual union with her, 

 though at first she shook her body as she had done before to get rid of her 

 male suitors. 



The polyandrous habits of this species were demonstrated, and con- 

 tinued observation showed that from time to time she was in conjugation 

 twenty-two times before ovipositing. From this it is inferred that the 

 female spermaceca may possibly contain a great variety of spermatozoa. 



