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Psyche 
[Vol. 94 
5 6 7 8 9 10 
LENGTH OF MALE ELYTRA 
Fig. 6. The size-frequency distribution of males with (solid bars) and without 
elytral holes in one sample. 
of most days as males ascended the vine from roosts under low and 
intemediate height leaves. 
I first became aware of the intensity of competition at these sites 
when I observed a male-male chase which ended with one male 
flipping the other from a tip leaf. A few minutes later, I observed 
two males near the tip of a nearby plant with elytra locked firmly 
together. After several minutes the two separated and spent some 
minutes antennating one another. This was followed by maneuver- 
ing in which one male attempted to run around the other which 
pivoted in place. Eventually one male was chased down the petiole 
where it lost its grip and fell from the plant. The male that remained 
walked to the female on the first unfolded tip leaf and immediately 
copulated. Within three to four minutes, the male that had fallen 
from the plant had climbed back and approached to within two 
inches of the pair. Antennating began again and the mounted male 
withdrew his aedeagus but remained on top of the female to con- 
front the intruding male. After two minutes the mated pair sepa- 
rated and the two males again clasped elytra and tugged against the 
