SCORPIONS, SPIDEKS, AND TICKS 



147 



reputation, but, with one exception, tliey are harmless and 

 among tlie most interesting animals in the world. 



Spiders have four pairs of legs and two pairs of jaws. At 

 the tip of each one of the larger jaws is a smaU hole, — 

 the opening of a poison gland through which the poison is 



Fig. 85. — Running spider : P, ]:talpi ; H, cephalothorax ; .4, abdomen. 



injected into the pre}' of the spider. Each member of the 

 small pair of jaws has attached to it a long, slender ap- 

 pendage called a palpus fplural, palpi) (Fig. 85). The 

 bodies of spiders consist of two parts, the cephalothorax 

 and the abdomen. They may have one, two, three, or 

 four pairs of single eyes, while certain ones living in caves 

 are blind. 



