LONGEVITY IN SATURNIID MOTHS 197 
TABLE 16 
Days 
(CGO WOO Sl tinge olin Dale ole Geter Oke RIT ce te MCE iano eee ee 1.02 
(CECT.O ial ON Mera re ees NeE Biro nye Caen we, MAS cf a 3.85 
GECTOM LAU CUD AbOs dari varee- Replies ede POLE Le EMO lees oT sues Cote Best 4.51 
ISGCLOPIAMEN GWRCOLK wrath ok ps er P eae atate Selene teks Mepacthe) o Alters 2 Sis deste 2.20 
TRIORTIE UIA as utce vacate PaacGeke is cneeerel tae R RS ere hh Brau CEE CT ecey teat Hatt tor eee nea 2.68 
Oly DMN Se mene cache ert ee gcc eR Ban SRS open Merce, Aare A Ang Saye 2.60 
EAD UA pecrey cle voit Busco a Sle Rees baa Scene Sota AE Pe ORONO Resa Recents crea Catena ete 1.33 
significant. Solid lines are for the males; dotted lines are for the 
females, and the dash and dot lines represent temperature. 
The figures on the base line are the dates when emergence 
occurred, the small numerals on the left are for the number of 
individuals, and the large figures are degrees of temperature in 
Fahrenheit. One can see at a glance how the males throughout 
keep slightly in advance of the females. 
An attempt was made to find whether any correlation exists 
between temperature and rate of emergence. No absolute state- 
ment will be ventured upon this point—the data are submitted 
for the readers’ own judgment—but to us it seems highly improb- 
able that such a close agreement as appears in a large part of the 
data should be no more than coincidence. <A careful inspection 
will reveal a closer agreement than might at first be thought, for 
of course it must not be expected that at the extremes of the sea- 
son, when very few individuals emerge, there will be a marked 
appearance of such a correlation. 
In justice to the evidence, however, attention should be called 
to the fact in the case of those which began to emerge about May 
8, 1911, that although the temperature was then only 71°, yet 
that was a decided leap above the temperature of the preceding 
week, which was below 55, or about the same as April. The 
temperature for the balance of the month of May continued abnor- 
mally high. 
Darwin mentions!” that this male priority is true of frogs, 
toads and the majority of salmon, ‘‘and throughout the class 
of insects the males are almost always the first to emerge from 
the pupal stage.” Whether or not this holds throughout the 
17 Descent of Man, p. 240. A. L. Burt’s reprint from 2 ed. n. d. 
THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 12, NO. 2 
