Rau — Longevity in Saturniid Moths. 3 



philosamia cynthia. 



telea polyphemus. 



samia californica. 



the minimum duration of mating in gelation to fertility. 



The Period of Incubation, 

 samia cecropia. 

 telea polyphemus, 

 samia californica. 

 philosamia cynthia. 



Miscellaneous Data on Saturniid Biology, 

 basilonia imperialis. 



probable two-broodedness of t. polyphemus, 

 infertility of polyphemus eggs, 

 crossings. 



eating of egg-shells by t. polyphemus, 

 callosamia promethea. 

 fluffy cocoons of s. cecropia. 

 duration of pupal stage in s. cecropia. 

 duration of the period of copulation in t. luna, 

 cocoon spinning. 



Summary. 



General Considerations and Conclusions. 



In a previous paper 3 we have reviewed fully the the- 

 ories which have been f ormnlated to account for the dura- 

 tion of life. Finding the existing theories inadequate to 

 account for the results of our experiments, we made 

 some suggestions as to what observations should be car- 

 ried on before one can philosophize on the meaning of 

 the duration of life. 



In the present work we have followed out some of the 

 courses of investigation mentioned there. The material 

 is similar, but in far greater numbers, and from a variety 

 of localities. The technique is essentially the same. We 

 must once more urge the reader to bear in mind that the 

 Saturniid moths have aborted mouth parts, and at no 

 time in the adult existence do they require or can they 

 assimilate food. This factor renders these moths ideal 

 material for such observations in so far as the duration 



3 Journ. Exp. Zool., 12: 179-204, 1912. 



