Rau—Longevity in Saturniid Moths. Bas 
LONGEVITY. 
In 1910-11, observations were made on the longevity 
of about 900 of these moths, and the mean duration of 
life of the different lots were assembled in Table 1 (loc. 
cit., p. 183). In the present work more than twice this 
number were employed in the continued search for new 
factors influencing the length of life. In like manner we 
have brought together in the table below the means for 
all of the lots of material herein considered. This table 
will frequently be referred to. (See Table 1.) 
PHILOSAMIA CYNTHIA. 
Two lots of Cynthia cocoons were obtained for this 
purpose, one lot from Philadelphia, which yielded 208 
insects, and the other from New York City, which gave 
forth 151 adults in good condition for these observa- 
tions. Table 2 below gives the details of the duration of 
life of the Philadelphia lot. The cocoons were shipped 
to St. Louis during the winter and kept out of doors un- 
til spring when they emerged between June 7 and 28. 
(See Table 2.) 
Table 3 presents the details of the longevity of the 
New York lot. The cocoons arrived here during the 
winter, were likewise kept out of doors in the trees until 
Spring, and 151 imagines emerged between May 30 and 
June 25. (See Table 3.) 
In comparing Tables 2 and 3 we find the New York 
lot to be slightly the longer lived throughout. In these 
two tables we find practically no difference between the 
mated and unmated males, showing that here at least 
mating does not perceptibly alter the life of the male. 
Among the females, however, the unmated individuals 
lived longer than the mated ones. A comparison of all 
males with all females shows the females as a class to 
be longer lived. 
