Rau — Observations on Samia Cecropia, Linn. 39 



16. My notes on the lapse of time between hatching 

 and egg laying are too insufficient to make any conclu- 

 sions as to whether the unfertilized female holds off 

 oviposition in the "hope" of mating. 



17. In all the cases observed the eggs were deposited 

 on the same day, or not more than one day after, the pair 

 had severed. 



18. In all but one case the time which intervened be- 

 tween the last egg laying and death was 1 day or less than 

 one day. The females, so to speak, were overtaken by 

 death in the act of ovipositing. 



19. In the one case referred to above the time which 

 intervened between the last egg laying and death was 3 

 days. After death this body contained 91 eggs. This in- 

 dividual was accidentally separated while in copulo only 

 8 hours and 30 minutes. Perhaps this is the direct cause 

 of a 3 days' duration of life without oviposition. 



20. The greatest length of time that any pair remained 

 in copulo was 1 day 5 hours and 30 minutes. The short- 

 est was 8 hours and 30 minutes. The average time spent 

 in copulo for the eleven cases observed was 21 hours and 

 20 5/11 minutes. 



21. The greatest number of eggs deposited by any one 

 fertilized female was 317. The smallest number was 159. 

 The average number for the eleven cases was 263 3/11. 



22. The greatest number of eggs deposited by two 

 unfertilized females was 380 ; the smallest 113. The aver- 

 age number for the four cases was 157. 



23. The average number of eggs deposited by the fer- 

 tilized female was greater than the average number of 

 eggs deposited by the unfertilized female by 104 3/11. 



24. The greatest number of eggs remaining in the body 

 of the fertilized female after death was 125, and in three 



