1977] 
Tietjen — Dragline- Following by Spiders 
167 
Figure 1. Diagrammatic summary of a typical trail including attachment disks 
(D) and female aerial lines (A). Female ground lines (G) and imitation draglines 
are laid contiguously (C) and discontiguously (DC) with the female dragline. Small 
strips of masking tape (T) attach imitation dragline to the wall of the arena and to 
5-mm diameter glass rods (R). Glass rods were usually parallel and 9-11 cm apart. 
When artificial “plants” (P) were incorporated into the experiment, female trails up 
to 236 cm in length were constructed. 
dopteran silk or conspecific male or female silk. Male L. punctu- 
lata were also exposed to female L. rabida silk. Clean cage cards 
were used as controls. A positive response by males to the silk 
consisted of exploring the silk and initiating courtship behavior 
within 5 min. 
Statistical analyses of data were performed according to the 
methods of Conover (1971) and Sokal and Rohlf (1969). All means 
are accompanied by their standard errors. 
Results 
COMPARISONS OF YEARLY SAMPLES 
No difference was found in trail-following behavior between 1974 
and 1976. Unprimed male L. rabida showed no difference in fre- 
quency of following-behavior (\ 2 = 0.0, df = 1, P > .50) and in 
