1970] 
Eberhard — TV asps 
251 
cryptic coloration and posture when it lands below. Both of these 
tactics may help explain why some orb weavers such as Zygiella 
litterata (Kaston 1948) and Singa haemata (Nielson 1931) build 
retreats with two open ends, and why some such as A. cornutus are 
crytically colored even though they are normally hidden during the 
day. The behavior of A. hu?nilis and S. caemeniarium indicate that 
while there may be selective pressure on orb weavers to hide them- 
selves, there is probably little or no pressure to hide their webs, at 
least from these species. 
References 
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