4i6 
Psyche 
[December 
might be considered more primitive, despite its apparent complexity, 
than the webs reported for other Hypochilidae. Following the scheme 
of Kaston (1964) the web of Plypochilus can easily be derived from 
a few capture lines extending from a silk-lined retreat. Possibly such 
capture lines, like those found in Ariadna (Segestriidae) webs, are 
homologous to the radial support lines of the lampshade of Hypochi- 
lus. The lampshade itself may represent an extension of an original 
silk-lined retreat. The primary function of the extensive lower tangle 
seems to be support of the lampshade. The more aerial webs of Hick- 
mania and Thaida are clearly derivative and point up the long history 
and relict nature of the hypochilids. One is tempted to speculate 
that hypochilomorph orbweavers may await discovery in some remote 
area ! 
Prey 2 hits lampshade 
Prey 2 larger than 
spider's abdomen, vigorous 
Prey 2 smaller, passive 
Feeding on prey 
Rocking, "testing" 
with prey l in jaws 
Prey I dropped, predatory 
sequence on prey 2 starts 
Prey 2 ignored, feeding 
continues on prey l 
Fig. 10. Response of H. gertschi to a second prey. 
Eberhard (1967) discussed the evolution of the use of silk as an 
offensive weapon, relying primarily on observations on Diguetia , a 
primitive, six-eyed, ecribellate spider. He postulated a series of steps 
through which spiders have come to use silk to subdue prey: 
1. No web is spun, prey subdued by biting. 
2. Ground webs spun, prey subdued by biting. 
3. Aerial webs spun, prey subdued by biting, wrapped to prevent 
loss during subsequent attacks. 
