The Nuptial Flight 143 
11:00 to 12:00 11 
12:00 to 1:00 4 
1:00 to 2:00 2 
2:00 to 3:00 : 
Dawn, 3:20 to 4.30 21 
Total 39 
Thus the two periods of activity are apparent at a glance at 
the figures. In certain experiments there was evidence that the 
activity of these moths was correlated also with the moonlight, 
and that perhaps these moths are more susceptible to the moon- 
beams than are their sister species. Further tests and reactions 
in this line will be discussed in later pages. 
Experiments on Callosamia promethea. 
Because I could not always be on the roof in the late after- 
noons to study the flight of promethea, my notes are fragmen- 
tary, but are sufficient to get the time of flight and to show the 
trend of activities in these moths. The cages containing the 
females were placed both on the roof and down in the back yard. 
Exp. 1. June 1. Wind, southwest; station, 1 mile north- 
west. The 9 male prometheas (4 bred and 5 native) were liber- 
ated in Forest Park at 5:05 p. m., in or near the path of the 
Wind from the house. Four of the 9 returned promptly, making 
the distance in 10, 11 and 12 minutes and 1% hours. The first 
3 were native ones which had voluntarily flown to the roof be- 
fore, and the last had emerged in the laboratory. 
. 2. June 10. The day was rainy and without wind. 
At 9 o’clock a fog formed, which was very dense by 11 :30 p. m. 
Oceasionally there was a trace of breeze from the east or north- 
east. At 9:14 3 marked males one day old were liberated % 
mile southwest of the house. None returned. 
. 3. June 10. Wind conditions same as m Exp. 1. 
Seven males were liberated in the park 225 yards east of the 
house. Five of these were aged 1 day, one 4 days and one 5 days. 
One, aged one day, came in with the cecropias at dawn. Let 
Me state here, before the reader formulates fascinating theories 
about the moth that came in at dawn, instead of its usual time 
