108 
Psyche 
[Vol. 92 
a b 
Fig. 2. Building behavior of an adult Eustala sp. (thicker lines are sticky thread), 
a) As the spider laid sticky line, it moved inward (upward in the diagram) along a 
radial line until it reached the temporary spiral where it attached the sticky line. 
Then it moved across the temporary spiral to the next radius, and then outward to 
the frame. Here it moved back partway toward the original radius, and attached the 
sticky line again, b) the spider then retraced its steps along the frame and went 
inward along the next radius, repeating the cycle of behavior shown in a. 
Without making further attachments, it moved on along the tem- 
porary spiral to the next radius and outward along this radius until 
it reached the frame. I was not able to observe temporary spiral 
destruction directly, but since temporary spirals were absent in 
completed webs and this was the only time during web building 
when spiders passed near this area, I assume that the spiders 
removed the spiral lines as they moved across them as do other 
araneids. On reaching the frame the spider performed a behavior 
never to my knowledge observed in any orb weaving araneid: it 
moved contrary to the circular direction in which it had been mov- 
ing (i.e. if it had moved clockwise along the temporary spiral, it 
moved counterclockwise along the frame - Fig. 2.) before attaching 
the sticky line; then it reversed direction once again until it encount- 
