130 
Psyche 
[Vol. 91 
burrow construction. They may also give the spider a foraging 
advantage by providing an ambush location. Evidence of the 
importance of surface cracks is given by the unfed G. micanopy 
which were provided with cracks. That group constructed nearly as 
many burrows as the fed group. 
Summary 
The relationship between the establishment of a burrow and 
presence of prey, availability of vegetation and the presence of a 
crevice in the burrowing surface was investigated in newly- 
dispersing Geolycosa turricola (Treat) and G. micanopy Wallace. 
The establishment of a burrow by G. turricola was dependent on the 
presence of vegetation within a feeding group. Establishment of 
burrows by G. micanopy was dependent on the presence of a crevice 
(not tested for G. turricola). Burrow establishment was found to be 
dependent on prey availability for any level of the other variables. 
The dependence on vegetation for burrow establishment in G. 
turricola is attributed to a greater tendency to build turrets in that 
species. The higher burrowing frequency in the groups that received 
food during the experiment is thought to be related to nutrition 
and/or prey availability. The tendency to build new burrows in 
crevices is known from field studies and may be related to 
advantages of protection from predators, thermoregulation, or 
foraging position imparted by the crevice. 
Acknowledgments 
I appreciate the thoughtful comments of J. Rovner, G. Baker, M. 
LaSalle, R. Altig, M. Morris, P. Ramey-Miller and several 
anonymous reviewers on various drafts of this paper. 
Literature Cited 
Brach, v. 
1976. Subsocial behavior in the funnel-web wolf spider Sosippus floridanus 
(Araneae:Lycosidae). Fla. Ent. 59(3):225-229. 
Eberhard, W. G. 
1971. The ecology of the web of Uloborus diversus (Araneae: Uloboridae). 
Oceologia 6(4):328-342. 
Enders, F. 
1975. The influence of hunting manner on prey size, particularly in spiders 
with long attack distances (Araneidae, Linyphiidae, and Salticidae). 
Amer. Natur. 901(970):737-763. 
