114 Trans. Acad. Sci. of St. Louis 
by the cynthias, and the other three, twice. Perhaps they had 
been misled too often, for none came to the roof again; but the 
attraction was potent to the inexperienced young males, due 
either to their unsophistication or their youthful antennae, for 
at dawn 14 new wild male cecropias came in, when we had not 
a cecropia female on the place! But let us give them credit 
for the fine discrimination which they exhibited, for they were 
extremely active in their flight and not one actually alighted 
on the cages, but fluttered about for some minutes as if in con- 
fusion, and then wandered away. Only when they were escap- 
ing thus were they captured with the net. It should be empha- 
tically stated that this indicates a certain kinship between the 
two species. It denotes, in my opinion, that the parting of the 
ways of the two species has been comparatively recent; that 
the cecropias have not travelled far enough from cynthias, 
phylogenetically speaking, to have altogether lost the recogni- 
tion of the familiar odor. 
Exp. 68. June 20. I was up all night and captured about 
70 cynthias, but no cecropias came before 3:20; then only 5 
came in. These came, of course, in response to the cynthias’ 
lure, since all cecropia females had long since ceased to exist. 
Exp. 69. June 25. The last wild cecropia flew to the 
cynthia cage on the roof at 4 o’clock this morning. 
Summary. 
In reviewing the experimental work on cecropias, we find 
that when the females are placed in cages at the open windows 
or on the roof, the wild males and also those bred in confine- 
ment and liberated at various distances come to the cages dur- 
in the night. During the period of experimentation, May 7 to 
June 25, 961 males flew to the cages on the roof. Of this num- 
ber, 170 were marked moths which had been bred from New 
York cocoons and had been liberated at various points and di- 
rections in an attempt to learn what distance they can travel 
and what factors determine their guidance. During this 
period, 791 native wild males flew to these cages containing the 
New York females. Of course no females came in, and none 
were taken out on test flights. The age of these wild moths can 
be approximately estimated by the condition of the wings. of 
those which came in, 715 were obviously fresh, young ones, and 
76 appeared old and tattered. 
