Keno : Snares or Snap-nets of Triangle Spiders. 195 



angles with the original thread and each other and lie in the same vertical 

 plane. These four threads form the radii of the web ; over them are laid 

 concentric cross-threads, 16-22 in number, and tolerably wide apart. The 

 loose net thus constructed forms a circular sector of about 45 degrees with 

 a radius of a foot or more. It is therefore very large in proportion to the 

 spider itself. The animal does not build itself any shelter or nest near 

 the web, but hangs on the first-named horizontal thread that bears the 

 web, near one of the twigs to which it is fastened, and at a considerable 

 distance from the common point of intersection of the radii. 



Next we have 

 a note, in 1867, 

 by Ausserer, who 

 found the spider 

 plentifully in the 

 dry pine-woods 

 of the Tyrol. It 

 spins, he says, 

 on coniferous 

 trees, an incom- 

 plete orb - web, 

 consisting- of but 

 3-4 radii, and pre- 

 senting - , there- 

 fore, the form 

 of an isosceles 

 triangle;* the 

 author is pro- 

 bably mistaken, 

 however, in 

 speaking- of 3-4 

 radii, the number 

 apparently being- 

 always four. 



In 1S72, Sor- 

 delli, who does 

 not appear to 

 have been ac- 

 quainted with 

 Th o r e 1 1' s ac- 

 count, published 

 another descrip- 



F'K' 1.— The snare of Hyptioies Paradoxus; from a 

 tch taken at Milan in 1871. After Sordelli. Atti della 

 :iet;V italiana di Scienze Naturali in Milano, XV. 



I.. F 



Red 



teauci 



Aw- 



tsserer, Die Arachniden Tirols nach ihrer horizontalen und verticalen 

 Verbreitungr, Verhandlungen dor k. k. zoolo^isch-botanischen Geseilschafl 

 "i Wien, XVII. (1867), P- '5o. 



1900 July 2. 



