34 Trans. Acad. Sci. of St. Louis. 



sible. From this time on the female was alone. On the 

 morning of Sept. 10 she was found dead, but during the 

 night before she died she had built another egg-case, a 

 beautiful piece of work 30 mm. long. Shall we say that 

 this female deposited three ootheca! Hardly, since the 

 first installment was abnormal and either interrupted or 

 made under difficulties and the second part soon added 

 to it, and both parts together compared well in size 

 with the second. 



Experiment 4. Aug. 15. The pair mated almost im- 

 mediately after being placed together in the cage at 7 

 A. M. At noon however they separated, probably on ac- 

 count of a heavy shower in which they were caught. 

 During the next few days, ordinary uneventful matings 

 occurred at the following times : from early morning 

 until noon of Aug. 16, and from 9 :10 P. M. of that same 

 day until noon of the 18th; from early morning until 

 noon of the 21st,- and about the same hours on the 23rd. 

 On the 24th, the male again mounted, but the female 

 would not consent to actual mating, and the next morn- 

 ing she was found pleasantly devouring him. A new 

 mate was at once supplied; at 4 P. M. he also mounted 

 her, but again copulation did not occur. The next morn- 

 ing revealed that he likewise had been eaten and an egg- 

 case had been made during the night. No new mate 

 could be supplied until the evening of the 27th, and he 

 very soon mounted. This time she carried him, without 

 attack or resistance, for about eighteen hours before 

 actual copulation occurred. In this respect the attitude 

 of the female seemed very different after oviposition 

 from just before. This copulation continued until some 

 time in the forenoon of the 29th, when the male severed 

 but did not dismount. He retained this position, with- 

 out resuming mating, for almost three days, when at 4 

 P. M. on Aug. 31 he dismounted without any display on 

 the part of either individual. This male was now re- 

 moved and a new one introduced which mated with this 



