2l6 



THE COMMON SPIDERS 



metatarsus of the fourth legs has the calamistrum more distinct 

 than in others of the family, and the metatarsus appears thicker 

 up and down than it is sidewise. The male has the legs longer, 

 particularly the first pair, of which the tibia and metatarsus are 

 more elongated than the other joints, and have many small 

 spines on the under side. The male palpi have the tarsus 



Fig. 495. Horizontal web of Uloborus near the ground, one side attached to a fallen 

 tree. The outer spiral is finished over only half the diameter of the web. A line of 

 loose silk runs across the web, and in the middle is a peculiar zigzag spiral. The 

 figure is about the real size. 



large and round, supported by a wide and very complicated 

 tibia. It lives under stones in the hottest and dryest places. 

 Uloborus plumipes. — Uloborus makes a round web, like those 

 of the Epeiridse, and when hanging in it resembles a Tetra- 

 gnatha. The adult female is about a quarter of an inch long, 

 and narrow like Tetragnatha. The cephalothorax is low in 

 front and extends forward, in the middle, beyond the mandibles, 

 and the back part is widened and swelled up on each side 



