Rau—O bservations on Samia Cecropia, Linn. 29 
following the morning when copulation began, which goes 
to show that if we add to this the length of time spent in 
copulo, which averages over twenty-one hours, we find 
that the greater number of females began ovipositing on 
the same day that copulation terminated, only four begin- 
ning one day later. 
(j) The number of days which elapsed in the life of the 
fertilized female from the day when the last eggs 
were deposited until death. 
Notes derived from observations in five instances. 
KNOWN AS DAYS 
A 4 3 
AT 1 
A 5 1 
A 3 0 
A 15 0 
In four out of five observations we find that death over- 
took the insect on the same day or one day after oviposi- 
tion. In one case, A 4, we found the female, after deposit- 
ing 217 eggs, spending the last three days of its life with- 
out ovipositing, while, upon dissection after death, 91 
egos were found in the abdomen. The pair A 4 were 
accidentally severed while they were in copulo 8 hours 
and 30 minutes, and a connection was never again re- 
sumed. Perhaps this was the direct cause of the three 
days’ duration of life between egg laying and death with- 
out further oviposition, while in the other cases death 
overtook the individuals, as it were, almost in the midst 
of the egg laying. 
IIL. OssEeRvATIONS ON COPULATION AND OVIPOSITION. 
(a) The length of time each pair remained in copulo. 
Notes derived from observations in twelve instances. 
KNOWN AS DAYS HOURS 
A 4 1 5:15 
1 0:30 
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