The Nuptial Flight 109 
recorded in other experiments, came in. There was hazy moon- 
light before midnight, and 7 moths came in during that time. 
All of these came from the northward; the wind was from the 
south. 
Exp. 49. June 3. The moon was hidden during the early 
hours of the night of June 2-3, but at 3 a. m., when I took my 
position on the roof, a half moon was shining. The first male 
arrived at 3:27 and the last at 4:25. There was a very slight 
breeze from the south, sometimes shifting to the southeast; all 
of the moths came from a northerly direction. There were 7 
young native moths and 5 marked ones already accounted for 
elsewhere. 
Exp. 50. June 4. The early hours of the night had been 
very dark; when I took my post on the roof at 3 a. m., a half 
moon was shining and the wind was blowing from the southeast. 
The first male flew in at 3:35, and the last one at 4:30. Only 6 
native and two marked moths flew to the cages during this 
Period. 
Exp. 51. June 4. Wind, south; station, 1% mile north. The 
65 males used in this experiment had accumulated from the 
following sources: 9 wild moths had come to the roof two days 
before; 18 wild moths had come to the roof one day before; 7 
wild males had come in at dawn that morning; 14 bred males 
had emerged from their cocoons three days before; 8 bred males 
had emerged that day; 9 bred males, two and three days old, had 
already mated. These were liberated 14 mile away, as nearly as 
Possible in the path of the wind, at 9:45 p. m. 
Of the first lot, only 1 of the 9 returned, and he came in at 
dawn, after an absence of six hours. Of the next lot of wild 
ones, 5 out of 18 came in, two of them in 35 and 65 minutes and 
the other three at dawn. The younger wild males distinguished 
themselves by making the best record; 4 of the 7 came back, one 
at 1:07 a. m., and the others at dawn. Whether this superior 
ability is to be explained by the probable youth of the con- 
testants, or by the fact that they had more recently made the 
flight to the roof (when they had come in of their own volition), 
and thus, in some way, profited by the experience, we shall not 
here presume to decide, but only take cognizance of the fact that 
this is the second time this condition has oceurred, where, in 
