184 THE WOLF SPIDER 



out, by a special vibratory action set up in the 

 thread by the spider ! 



The original photo-micrograph (Fig. 60) 

 shows this foot amplified to 260 diameters. 

 The approximate focal length was 37 inches ; 

 an eye-piece of 7 diameters, and a 1-inch 

 objective were used. 



At the request of the editor of Knowledge 

 this appeared in a whole-plate illustration in 

 the July number of that magazine, 1904. 



The Wolf Spider. 



(Lycosa.) 



The Wolf Spiders usually pursue their prey 

 by running after them, hence their name. 

 There are some spiders that do not seem to be 

 able to run, but are good jumpers. Of these 

 Salticus tardigradus and Pelenes tripunctatus 

 are English examples. The former are usually 

 found in park overlapping palings, the latter 

 at the base of the underclifis near the seashore. 

 The Wolf Spiders are numerous, and are found 

 near most woods in England. 



