128 Trans. Acad. Sci. of St. Louis 
These 21 male cynthias were unmated and from 1% to 34 day 
old. They were liberated in Tower Grove Park at 10 p. m. The 
results were practically the same as in the last test, wherein the 
conditions were similar; none returned the first night, and two 
arrived about 11 o’clock the second night. 
Exp. 27. June 22. Wind, southeast; station, north and 
slightly west, 4% mile. The 35 males were 1 to 114 days old, 
and 21 of them had already mated. They were liberated at 
10:08 p. m. in a large vacant lot 14 mile north, and a few rods 
west of the house. When I arrived home at 11 p. m., after 
attending to another experiment en route, I found the children 
in high excitement catching the moths; they had captured 12 
which had arrived before I did, so I have not the exact time of 
their arrival; 7 more came in before midnight, and 2 more came 
at 12:40, making a total of 21 which returned with speed the 
first night; none came on later evenings. The deductions are 
self-evident. This series of four experiments, 25 to 28, shows 
clearly that when the moths are liberated in the path of the wind, 
many return promptly for a distance of %4 mile; if out of the 
path, they are lost. When we compare the flight of the mated 
and the unmated males, both-of the same age, we find them prac- 
tically equal; 64 per cent of the mated individuals came in and 
57 per cent of the unmated ones. 
Exp. 28. June 22. Wind, southwest; station, 14 mile west. 
These male cynthias, 22 in number, unmated, aged 14 to 34 day, 
were set free at 10:35 p. m., to complete the series of tests from 
all directions being carried out this evening. For the third 
time we find that none came in the first night, 4 returned the 
second and 2 the third night, all during the usual period of 
flight of this species. 
Could anyone imagine experiments to behave so obligingly— 
to warm the cockles of the heart of even an entomologist—as 
does this series! Of the 70 moths liberated in the three direc- 
tions where the wind was unfavorable, not one returned that 
night, while of the 35 liberated near the path of the wind, 21, 
or exactly 60 per cent, came scurrying back, and more than 
half of them beat me home! 
Exp. 29. June 22. Wind, southeast; station, 1 mile west. 
This test was the same as the last, excepting the distance was 
