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. Early 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. 14 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 cut 

 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. 



* — Eggs were deposited on this day, but were included in the next 

 day's count. 



i* In the Cynthia eggs this mass was dark brown. 



