Rau—O bservations 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 
