18 
ULOBORUS QUADRI-TUBERCULATUS. Thor, 
Syn, : 1892. Ulohorus quadri'tuberculatus^ Thor. In MSS. 
Description of Plate lii % . — /i, figure of spider magnified ; natural size; spider 
in profile ; maxillae and labium ; epigyne ; j^, do. in profile ; cocoon magnified ; 
1', do, natural size, \%a. Web of spider in Pine Apple plant reduced. 
This spider is not uncomrnon in Singapore. It makes a curious snare in the 
centre of the Pine Apple plant [Brontelta ananas)^ which it forms peculiarly to suit 
the shape of the plant, and I have not found its snare elsewhere. The Pine Apple is 
a South American plant, and has only of late years been introduced into this part of 
the world. Was the spider introduced with it, or is it a native which has adapted its 
snare to the introduced plant ? The snare is horizontal, loosely made of rays on the 
top, in the centre of which on the lower side the spider sits. 24 top rays not adhesive. 
About 24 lower or side rays on which there is a 14 thread spiral. The snare is held 
open at the bottom so that the spider may drop through. When disturbed the spMer 
hangs on by a I inch thread from centre of web and swings itself violently to and fro. 
The little spiked cocoon is attached to the top rays, close to where the spider sits in 
the centre. 
