1979] 
O’Neill — Behavior of Philanthus psyche 
33 
Figure 4. The weaving flight of the male. The solid arrow indicates the wind 
direction. The dashed line indicates the flight path of the male. 
to the perch, respectively. Even when plants downwind of the 
perch were marked, the male often flew downwind of the plants 
before dragging his abdomen. 
When wind direction reverses, perches moved to the opposite side 
of the territory and different plants were marked (Figure 5). In 
another area when vegetation was more sparse, males often had 
only one plant per territory and would always perch on the 
downwind side. The relative position of the perch to the plants on 
which the male drags his abdomen, as determined by wind direc¬ 
tion, may be related to the same reason that the weaving flight 
occurs (i.e., he is in a position to detect the pheromone). Since he 
faces or is lateral to over 95% of the plants which he has marked the 
male is also in position to detect any females which have landed 
upon or near them. 
