220 
Psyche 
[Vol. 88 
Figure 1. Adult female of G. solani positioned at the exit axil during an alarm 
response. 
moved quickly to the axil of the leaf and oriented herself a little to 
one side of the nymphs’ path (Fig. 1). When she was in this position, 
the nymphs moved up the stem rather than down. 
As more of the nymphs left the leaf, the female sometimes moved 
about the axil and positioned herself along the side of the stem as 
the nymphs moved past her. When she was in these positions, she 
seemed to have little physical contact with the nymphs which filed 
past her unless they happened to bump into her in passing. Part way 
through an alarm response, the female moved quickly up the stem, 
usually to the axil of the first leaf above the previously occupied 
leaf. Many of the nymphs had already reached this axil and had 
moved down the petiole onto the new leaf. A few nymphs often 
proceeded above this axil and continued up the plant before 
returning to the group. The female oriented herself at the axil of the 
new leaf (Fig. 2) and waited there as more nymphs arrived. After 
most of the nymphs had passed along the petiole, the female joined 
the aggregation on the new leaf. 
