66 The Structure and Habits of Spiders. 



The web of Nepkila plumipcs, described by 

 Wilder, consists also of loops running round 

 about quarter of a circle, Fig. 30 ; and in this 

 web the smooth cross-lines which are first 

 spun are not removed, but remain after it is 

 finished. Fig. 31 shows part of one side of a 

 web ; the arrows marking the smooth thread, 

 and the direction in which it was spun. 



Fig. 30. 



Argiopc, the large black and yellow autumn 

 spiders, cross the middle of the web with a zig- 

 zag band of white silk, which, as the web is 

 obliquely hung, partly conceals the spider under 



