The Nuptial Flight 139 
males arrived during the night, at 11:10, 11:35 and 12:08 re- 
spectively. These arrivals seem to be correlated with the ap- 
pearance of the moon, and the details are discussed elsewhere. 
Exp. 5. May 26. Wind, east, station, 1 mile west. With 
half a dozen female polyphemus in cages at the window, I lib- 
erated 10 males (6 aged one day, 2 aged two days, 1 aged 
3 days and 1 aged 11 days) one mile west of the house. The 
wind was blowing from the house toward the males. Four of 
the 10 returned, one after 214 hours and 8 the next night, 
after an absence of 24, 25 and 28 hours. On this moonlit night 
their actual time of arrival was 11:38 p. m., 1:10, 1:50 and 4:10 
a.m.. During the period of dawn two native males also flew in. 
Exp. 6. May 27. Wind, east; station, 134 miles west. Five 
native males which had come to the roof were liberated at 10:50 
p.m. One came in at the following dawn. 
Exp. 7. May 27. Wind, east; station, 1% mile east. Three 
males, all one day old, were liberated in the park, in a most 
unfavorable position in regard to the wind. To our surprise, 
after an hour and forty minutes, one returned. Another was 
picked up by a schoolgirl next morning, two blocks south of the 
point of liberation. 
Exp. 8. May 27. Wind, east; station , 144 miles east. Two 
native males, one old and one young, which had recently come 
in, were set free at 11:10 p. m. One of these wandered in three 
nights later, during the dawn hour. 
Exp. 9. May 28. Wind, southeast; station, 3 miles north- 
west. When the cecropias were taken out for their long dis- 
tance test, 19 polyphemus were also liberated. Four were bred 
Moths 1144 days old, and 15 were captive wild males. Not one 
of these 19 ever returned. Of course the ceeropias did scarcely 
better; only one came back, and that tardily. : 
Exp. 10. May 29. The night was clear, with the wind 
blowing from the east; at 9:00, the moon arose and remained 
bright. At 11:20 three native polyphemus flew in. At mid- 
night the moon became hazy, and soon dark. Three more came 
in with the cecropias at dawn. This again shows that their 
flight is not confined to one brief period of the night, as the 
cecropias, but these flew for a short period before midnight and 
again during the dawn hour. Whether these periods are deter- 
