LONGEVITY IN SATURNIID MOTHS 183 
OBSERVATIONS 
In 1909 notes were made upon the duration of life in the Cecro- 
pia moth. The observations were made upon only a small 
number however, so it was decided to carry the work on during 
1910, on a much larger scale. New factors of much interest were 
discovered entering into the work of that year, so it was deemed 
best to continue an experimental investigation through a third 
year in order to get adequate and conclusive data on some of 
the phenomena appearing. 
These three consecutive years of observations on the Cecropia 
were made upon material gathered from the same locality, River 
des Peres, St. Louis. The parallel work was carried on upon the 
Cecropia moths from Long Island, New York, in order to ascer- 
tain whether there were any unusual phenomena in the St. Louis 
material due to purely local conditions. 
TABLE 1 
Mean duration of life 
| 
| 
| 
| 
| 
2 ne) 8 3 
D D a) & A 5 5 
i} 
| 3 Ce S ae 28 an a BUA 
LOT a 40 zo cS ano) 
a < a < a ee se) S ne 
5 a a = < 
< g 2 S| ge | 36 3 3 za 
= p = p < < 4 4 2 
| 
| 
S. cecropia. 1910. | | | 
St. Louis (early). .| 17.40 17.67) 14.83 16.80) 15.77) 17.29) 17.59) 15.79} 16.65 
S. cecropia. 1910. | | | 
St. Louis (late)... .| 10.62) 10.52) 9.46 10.50. 9.90 10.51 10.56 9.76} 10.14 
S. cecropia. 1911. — | | | | 
Sty lowiss.)...9.- 7. 52\) 7.738) 6:96) -7.90| 7-20) 787-70) 7, 71) 771 
S. cecropia. 1911. | | | | 
ING wa Orkerr sete 7.90| 8.54) 6.62] 8.25) 7.25 8.42) 8.37) 7.65) 8.06 
S. cecropia. 1911. | | 
Ineubatoneces. 2-4) 8.16) Sad) (7.03 8.80 7.40 8.48 SA BW S00 
S. cecropia. 1911. | | | 
ees Boxe scenes. 4 | | 17.58} 19.39] 18.60 
C. promethea. 1911.) 3.74) 4.21| 5.18} 6.54) 4.51} 4.91) 4.13) 6.21] 4.82 
T. luna. 1911........| 4.60) 6.07] 6.60] 5.80] 5.60, 5.96 5.86, 5.96/ 5.90 
T. polyphemus. 1911. | | | 5.33] 9.29] 6.79 
Table 1 brings together the means of all the lots of material, and will be referred to frequently 
for comparison. 
2 Trans. Acad. Sci. St. Louis, vol. 19, pp. 21-48, 1910. 
