Rau—Longevity in Saturnid Moths. 3 
PHILOSAMIA CYNTHIA. 
THE MINIMUM DURATION OF MATING IN RELATION TO FERTILITY. 
THE PERIOD oF INCUBATION. 
SAMIA CECROPIA 
TELEA POLYPHEMUS. 
SAMIA CALIFORNICA. 
PHILOSAMIA CYNTHIA. 
MISCELLANEOUS Data on SATURNIID Bronoey. 
BASILONIA I 
Ss. 
PROBABLE TWO-BROODEDNESS OF T. POLYPHEMUS. 
INFERTILITY OF POLYPHEMUS EGGS. 
CROSSINGS. 
EATING OF EGG-SHELLS BY T. POLYPHEMUS. 
CALLOSAMIA PROMETHEA. 
FLUFFY COCOONS OF 8S. 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* we have reviewed fully the the- 
ories which have been formulated 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 
8 Journ. Exp. Zool., 12: 179-204, 1912. 
