SPIDERS AND THEIR IVEB-MAKING 19S 



A large one may be found, perhaps, dragging after it a 

 dirty white silken ball (fig. 153). This is the egg-sac, 

 which is strongly attached to the spinnerets of the female, 

 being carried about by her until the spiderlings hatch. 

 Issuing from the egg-sac they climb on the back of the 

 mother, and are thus further carried and protected by her 

 until they are able to care for themselves. 



Upon fences, the sides of out-buildings, on the bark of 

 trees, or fallen logs, may be found certain small, robust, 

 short-legged spiders which move chiefly by sudden leaps. 

 These are the jumping spiders (fig. I 54). They are usually 

 black, with red or other striking color-markings, and two 

 of the eight shining black eyes are much larger and more 



Fig. 154. Fig 155. 



Fig. 154. — A jumping spider (Attidae). (From Jenkins und Kellogg.) 

 Fig. 155. — A crab-spider (Thomisida;;. (From Jenkins and Kellogg.) 



conspicuous than the others — much larger, indeed, than 

 the eyes of any other spiders of equal size, and they give 

 the jumping spiders a peculiarly threatening appearance. 

 These can walk sidewise or backwards with facility, but 

 are readily distinguished by their leaping and their big 

 eyes from the true crab-spiders described in the ne.xt 

 paragraph. 



In the cracks and crevices of fence and bark, and on 

 plants, may be found certain short, broad, flattish, usually 

 greyish spiders, which can run sidewise or backward 

 more readily than forward. These are known as crab- 



