The Nuptial Flight 128 
Exp. 6. June 14. During the afternoon, two male eynthias 
escaped while being handled, and promptly fled; at 12:20 and 
12:30 a. m. they came back. 
Exp. 7. June 15. Wind, not perceptible; station, 4% mile 
west. Twenty male cynthias, all less than one day old, were 
liberated at 11:10 p.m. Just one half of these, or ten returned; 
nine came in between 11:20 p. m. and 1:40 a. m., and one at 
dawn. I have not yet discovered a reason why these should be 
so much more agile in returning than were their brothers in 
apparently comparable tests. 
Exp. 8. June 15. Wind, imperceptible; station, 1 mile 
west. Eighteen unmated cynthia males, all two days old, were 
liberated. It is interesting to find that while in the last test 
50 per cent returned from 1% mile west, here 22 per cent re- 
turned from one mile in the same direction under the same con- 
ditions. The four returned at 11 35, 1:15, 2:05 and 3:40, the 
first one making the mile in 29 minutes. 
xp. 9. June 15. Time, place and weather, same as Exp. 
8. Five males that had already mated, four of them once and 
One of them twice, were also liberated one mile west, to see if 
mated males are less or more responsive to the lure. Only one 
returned, at 3:45. The numbers are too small to show anything 
excepting that the mated males appear in no way different, in 
ability or inclination, from the unmated individuals. 
Exp. 10. June 15. Wind, imperceptible; station, 1% mile 
north. On the same night of the eminently successful experi- 
ments just preceding, we tried liberating moths in the other 
directions of the compass. Twenty-four males one-half day old 
were set free 4 mile north at 10:58. Only one returned that 
night, at 12:45; two more came in the following night. 
Exp. 11. June 15. Wind, imperceptible; station, % mile 
east. These 22 young males, % to 34 day old, were set free in 
the park east of the house at 11:25. While 4 eventually re- 
ed, only one came in the same night, at 1:40, and can be 
Considered as really significant. Thus the returns from both 
of these last two directions were really negligable; in both ex- 
Periments the individuals were out long enough to come upon 
the trail by aimless wandering. i 
Exp. 12. June 15. Wind, imperceptible; station, 2 mile 
South. Under exactly the same conditions, 22 males were liber- 
