FINAL SUMMARY. 
A few outstanding facts may be gleaned from the foregoing 
pages, as follows: 
1. The sex life of the various species of Saturniid moths is 
very definitely interlocked with rhythmic periodicity, and that 
rhythmie periodicity is affected by conditions of light. 
2. During the period of their flight, recurring once in each 
cycle of twenty-four hours, the males fly to the females from 
different distances, varying from a few yards to a maximum 
distance of three miles. (No greater flights were attempted.) 
3. The various distractions encountered en route, city street 
and automobile lights, house-tops, street odors, city smoke anc 
beating rains offer no hindrance to males responding to the at 
traction of the females. 
The work shows that the number of marked males that fly 
to the females is in inverse ratio to the distance from the point 
of liberation. 
5. Evidence throughout the experiments proves that the 
males reach the females by odor perception, and that wind is 
the agent by which the odor is carried. When the males are 
liberated elsewhere than in a current of air blowing direct from 
the females, few or none find the female. 
6. The general term ‘‘night fliers’’ should not be applied 
to these moths, for each species has its own brief period of flight 
during the cycle of twenty-four hours. The moonlight some- 
times influences the period of flight in some species. 
7. While odor is the influencing medium inducing the nup- 
tial flight, the attraction cannot be termed chemotropism, 
since trial and error method play an enormous part in locating 
and finding the female. 
8. The male is an ardent lover, and while the females are 
often inactive, not all are mere bundles of inactive, odoriferous 
matter, but some females strongly display sex emotions. 
9. Each species regularly has its short period of activity. 
This rhythmie periodicity can be changed to a considerable de- 
gree in Cecropia by simulating dawn conditions at high noon. 
In Cynthia, the hour of activity is more deeply set and cannot 
be changed so readily ; therefore we think Cynthia is phylogenet- 
ically the older of the two species. The fact that the various 
