LONGEVITY IN SATURNIID MOTHS 187 
The desire to test further the influence of temperature upon 
length of life led us to (1) the Incubator Experiments, and (2) 
the Ice-Box Experiments. 
Early emerging, long-lived Cecropias, 1910 
TABLE 3 
DAYs 
| ey 
CLASS | fo] ho 19! fe! he| 19 | 19| fol fe} pe} fe! fo] fo] ho {2 MEAN 
S| 0 ea eS Sa 
at A iu Vol 
Mated @s............ 1 Hs lal 2 | a {al 2tal | | | fal {ala} {asl 17.40 
Unmated o’s......... 1 21 | a 4 | | 3 3) 1) 1 4) 3) | 2 a 3 2) 2 a af | a) | 1182) 17.67 
Meiied @iete-ceseecceeee| f(t a21 ol] d) Bes inate} ay 2h | Al si a a | |26| 14.83 
Unmated 9’s......... 1 1} | 1 | 1) 2) 1) 2) 1 2) 3) 2 a2)" la} 2) 1) | 1/25) 16.80 
All mated insects ......| 1) 1} 1) 1) 3 1 1) 1 3} 3} | 3} 2} 1) 2 | 3} 1) 4} 2) 3) 1 | 1) 1) 41) 15.77 
All unmated insects... 1) | 1/ 1) | 3) 1 1) 3 2 2) 1) 3 3 3 4) 3) 3) | 3) 3 3 3 2) 1) 1) 2 2 2157] 17.29 
INE US ee } a) | a} | a} 3} a | aja] | 2a al aaa 14/3 3 2 2) 1 2) | 2/4) 147 17.59 
NOS Ee ae oe 1) 1} 4] 2} 2 1) 1] 2 5} 4] 2) 2) 2) a} 4! 3} 3} a) 3 1] 3} a) a) | | | 2 a) | 1151] 15.79 
Whole population .... 2| 1223 4 2) 2) 6) 5) 2) 4) 5) 4 5 4 6) 4) 4) 5) 6) 4) 3) 2) 1) 2) 2) 3) 1 2/98) 16.65 
TABLE 4 
Late emerging, short-lived Cecropias, 1910 
DAYS | 
GUNES ho} |rof aco 19| fo) fro) fro] fro] fre] fro) fo] fo) fro a [PES 
eee carRercrecesseeessseseses| 9 
es el ee RR 
| | | | 
Menace ree eh te | fa} fal | [aaa 4 [3 1| 18 | 10.62 
Wmmieated GUS. sstewcses ss ear ne 2 koi eLe 12 RS eaiesiieg| He e200 TORS 2 
Mattes Ocaae ai egies: 1) | 3i a} a} | taal at a ala) | of atal fal | 1} | 30| 9.46 
Wramated® Q’s\ ss tee. UES oe] | teat lee 1 1) | 12) 10.50 
All mated insects............... | 2} | 3) 2) 2) 1) 2) 4 5 5] 3 3} 1] | 6 2) 4) | 1 1| 1) 48) 9.90 
All unmated insects............ | | 2) | 5) 5 1) | 3) | 3) 1) 3) 43 1 1) | 32} 10.51 
J CR ee ee | 1 1) 1) 1) 2) 3) 3 2) 4 1) 3) | 7] 2 6 | 1) 38 | 10.56 
IIT Coli ie ae ee ee nee | 3) | 3) 1) 3) | 5] 6 3) 3) 2) 2) 1) 1) 2 4} a) | a) 2) | 42] 9.76 
Whole population...............| 2) 3 2 4| 1) 7] 9) 6 5) 6| 3) 4) 1) 9 67 1) 1 2} 1) 80} 10.14 
INCUBATOR EXPERIMENTS, CECROPIA 1911 
After the work of 1910 had given a clue that the climatic con- 
ditions may have been a factor in regulating the duration of life, 
it was thought that if by some method the cocoons could be con- 
trolled so that the imagines could be gotten in January or Febru- 
ary and subjected to the climatic conditions of that season, some 
interesting results would be obtained. 
Some 300 cocoons were placed in an incubator on September 
20, the temperature of which was regulated to about 70° F. 
