92 Trans. Acad. Sct. of St. Louis 
tween 50 and 55 during the night, only two native males flew in 
at the window. 
Exp. 11. May 17. Wind, south until 7 p. m., then shifted 
to east ; station, 250 yards east. The two native males which had 
come in during the night, and two bred males, aged 44 hours 
and 6 days respectively, were liberated in the park east of the 
house at 6:30 p. m. None of these moths returned that night, 
but three mornings later the youngest one was with native males 
that flew to the laboratory. It would be interesting, indeed, to 
know where and how he at last ‘‘hit the trail.’’ 
Exp. 12. The night of May 17-18 was chill and stormy; the 
temperature was about 56°, and almost an inch of rain fell be- 
tween 7 p. m. and 7 a. m., while a strong wind blew from the 
east, through the upstairs windows. The two laboratory rooms 
had five windows, two opening directly to the east and three to 
the west. The two eastern windows contained 7 cecropia and 3 
polyphemus females, and the western windows had 4 cecropia 
(1 dead) and 3 polyphemus females; all these had been in this 
position for two days, giving ample exposure for the dissemina- 
tion of odors or any other means of communication which he- 
trayed their presence. But the two nights preceding had brought 
in none, and even the cocoons on hand were yielding no moths; 
the beating rain foretold disappointment again, so, being dead 
for sleep, I retired at midnight. 
At 4 a. m. I was startled awake by the beating of wings on 
the window-shade in my second floor bedroom, and the rasping 
rustle of many wings in the laboratory. Going to the third floor, 
three steps at a jump, I was met by dozens of excited cecropias 
flying about the cages on the west windows, and looking out I 
saw many more fluttering in my direction and making their way 
erookedly to the windows, all through the pouring rain. The 
females in the cages, heretofore always sluggishly quiet, showed 
great agitation, beating their wings against their cages. This 
shows that the females, too, join in the activity, or, as later ex- 
periments will show, by flapping their wings they disseminate the 
odor from their bodies. Excitement ran high as other members 
of the family, brought thither by their curiosity regarding the 
unwonted commotion at such an hour, forgot their sleepiness — 
