32 Trans. Acad. Sci. of St. Louis. 



None other could be found to succeed him. On the morn- 

 ing of the oOth, two new egg-cases were found. It seems 

 probable, though uncertain, that each female had de- 

 posited one, for further observations proved that usually 

 an interval, with copulation, occurs betw^een the making 

 of the first and second egg-case. 



On Sept. 1 another male was secured and placed with 

 them. No observations could be made until the evening 

 of the 3d, by which time he had been eaten. On the next 

 morning the green female was also dead, but the death 

 had been a natural one as no marks of violence could be 

 found on the body. From this time forth no males 

 whatever could be secured, and the gray female alone 

 remained. Ten days later a newly-made egg-case was 

 discovered. This female was not observed in copulo 

 between the first and second egg-laying, although this 

 may have occurred during my absence from the experi- 

 ments during the first of September. This new ootheca 

 was placed flush with one of the first ones, slightly over- 

 lapping it, as if intended for its continuation. Did the 

 insect recognize its first effort and attempt to enlarge 

 upon it, or was the choice of location purely accidental? 

 This insect was observed daily until its death Oct. 8, 

 and fed occasionally, but it required less food from day 

 to day as old age came on. After the chilly nights she 

 would be found stretched upon the w^ires of the cage 

 quite as if dead, but with the warm rays of sunshine she 

 would soon revive. 



Experiment 3. Aug. 13. A male and a gray female 

 were caught in the garden and placed in a cage. Soon 

 the female was observed to be carrying the male, and so 

 they walked about during the entire day, the female for 

 diversion devouring many flies; not until sunset did 

 actual copulation take place. This mating continued for 

 an unusually long time, until between midnight and 

 morning of Aug. 15, or more than eighteen hours. They 

 mated again on the 17th, from early morning until late 



