Rau—Longevity in Saturnuid Moths. 35 
of their eggs deposited. During 1911-12-13, the details 
of oviposition were recorded for 409 insects of the 24 
lots as enumerated in table 20.° 
Inspection of these figures shows that the mean per- 
centage of oviposition in Polyphemus varies from 81.9 
to 89.6%. There is only a slight difference in the mean 
per cents in the two lots from St. Louis, while a far more 
pronounced difference is at once apparent between the 
Fall River, Mass., and the Augusta, Ga., lots. Perceiv- 
ing that the mean per cent for all polyphemus combined 
is 86.5, and that 95 females of the 137 deposited from 91 
to 100% of their eggs, we must conclude that as a whole 
Polyphemus, even unfertilized, oviposit almost perfectly. 
In the Cynthias we have two lots, one from New York 
and one from Philadelphia, but here we have notes based 
on the mated and unmated condition, and the effects of 
this factor are at once apparent. In the New York 1913 
lot the mated ones give a mean per cent of oviposition 
of 76.9, while the unmated females give only 22.4%. To 
be sure the unmated females of the 1912 lot give a mean 
per cent of oviposition of 61.6, but these were the vig- 
orous individuals already referred to which survived 
out of 300 cocoons. The Philadelphia material showed 
practically the same relation as the first; the mated in- 
sects deposited 57.5% of their eggs and the unmated ones 
only 22.5%. 
The data for S. cecropia are self-explanatory, but we 
may call attention to the fact that here again the per- 
cents for the unmated insects were somewhat lower, 
while the Cecropias all taken together did not show such 
a well-perfected ability completely to oviposit as did the 
9 For instance, on the first line we read: Telea polyphemus, from 
New York, emerged 1912, and all remained unmated; 1 insect deposited 
from 61 to 70% of the total number of eggs she carried, 5 of them 81 
to 90%, and 5 of them 91 to 100%; total, 11 insects. The mean per cent 
deposited by the whole population of 11 females was 87.7%, while the 
maximum actual number of eggs deposited by any individual of the lot 
Was 327 and the minimum 89. 
