Rau—Longevity in Saturniid Moths. 47 
The individuals were isolated immediately upon leav- 
ing the cocoon, and placed one pair in a cage. Frequently 
some eggs were dropped ere mating began, but these 
were in all cases vigilantly removed and not taken into 
account. Karly each morning the eggs from each cage 
were counted and placed in a vial with a cotton stopper 
and labeled; this comprised the oviposition of the pre- 
ceding 24 hours. The emerging caterpillars all died in 
their vials. Later, these as well as the empty egg-shells 
were counted, and all of the eggs from which nothing had 
hatched were dissected, to find whether they contained an 
embryo or were infertile. In all of this material, as in the 
former lot, all of the eggs that were shriveled proved in- 
fertile and contained only a dried mass of yellowish sub- 
stance.!4+ It also sometimes happened that the smooth, 
round eggs of the Cecropia contained a fully-formed in- 
sect which had been unable to bite its way out. There 
were, however, a few exceptions in each class, and the 
external appearance was not relied upon, but each egg 
was cut open and the contents examined. The small 
number of fertile eggs which had the opening partly eut 
by the caterpillar in attempting to emerge were in every 
case counted with those which normally emerged. 
The tables give the number of hours spent by each fe- 
male in copulo. The letter ‘‘N’’ signifies a normal, free 
mating, which means that mating began in the early 
morning hours and continued throughout the day until 
evening. Each day’s deposit is recorded separately, and 
separated into the following four classes: 
T—Total number of eggs deposited that day. 
F H—The number in this day’s deposit that were fertile and 
hatched. 
F U—The number fertile but unhatched. 
Inf—Infertile. 
*—Hggs ae a on this day, but were included in the next 
day’s c 
14In the Cynthia eggs this mass was dark brown. 
