212 



THE COMIMON SPIDERS 



than the body. In the females the mandibles are a little thick- 

 ened in the middle. In the male they are elongated and turned 

 forward at the ends and curved apart in the middle, and have a 

 small tooth on the front near the base. The palpi of the males 



Fig. 48S. Web of Amaurobius sylvestiis on a rough conglomerate rock. 

 The spider had a nest in a crack at one side. 



(figs. 485, 486) are short, with the patella as wide as it is long 

 and wider than the femur and tibia. The tarsus is half longer 

 than wide and pointed at the end. In the tibia there is a little 

 difference between the species that can be seen by looking at 

 the palpi from the side ; in volucripcs there is a stout process 



