THE MYRIAPODS AND ARACHNIDS 



8l 



ing and some fatal ones have resulted from its bites. As 

 a rule spiders are not only harmless, but useful creatures. 

 The scorpions are arachnids which may very easily 

 be recognized by their large pincers or claws, and their 

 long jointed tail which ends in a sting. What corresponds 

 to the mandibles of the spiders are small, short pincers, 

 the large ones corresponding to the spider's maxillae. 



PIG. 67. A scorpion, Vejovis boreus. (After Essig.) 



The scorpions are predatory animals and live under rocks 

 and in other protected situations, commonly in warm 

 climates. 



The ticks and mites form a more or less degenerate 

 group which contains many parasites oh both animals 

 and plants. The. ticks live upon the blood of various 

 animals and not infrequently attack man. They have a 



