1969] 
Robinson — Predatory Behavior 
501 
Stage 5. Immobilization biting retained for some prey; other prey 
overcome by immobilization wrapping. Immobilization 
wrapping of large prey includes a new behavioral com- 
ponent — in the early stages swathes of silk are thrown 
over the prey from a distance. The spider may even turn 
to face away from the prey whilst throwing. Function 
of new type of throwing: the protection of the spider 
from the defensive armature of the prey. Found in Ar- 
giope spp. also Eriophora sp. Prey stored in the web. 
Figure 2 illustrates the additive nature of this scheme. 
Acknowledgements 
The authors are grateful to Drs. M. H. Moynihan and Wm. 
Eberhard for reading earlier drafts of this paper. The work of Miss 
H. Mirick was supported by an NSF undergraduate research par- 
ticipation grant. 
References 
Eberhard, W. 
1967. Attack behavior of Diguetid spiders and the origin of prey 
wrapping in spiders. Psyche 74: 173-181. 
Peters, H. M. 
1931. Die Fanghandlung der Kreuzspinne ( Epeira diademata L.) Ex- 
perimented Analysen des Verhaltens. Z. Vergl. Physiol. 15: 
693-748. 
1933a. Weitere Untersuchungen iiber die Fanghandlung der Kreuz- 
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1933b. Kleine Beitrage zur Biologie der Kreuzspinne Epeira diademata 
Cl. Z. Morph. Okol. Tiere. 26: 447-468. 
Robinson, M. H. 
1969. Predatory behavior of Argiope argentata (Fabricius). Am. Zool. 
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