ARTHROPODA 



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Arthrogastres, in which the abdomen is segmented and including 

 the first five orders given below, and the Sphaerogastres, in which 

 it is unsegmented, comprising the last two orders. 



Order i. Scorpionida 



The Scorpionida (Lat. Scor- 

 pio, scorpion), or scorpions, 

 are animals inhabiting warm 

 countries, the largest species 

 being confined to the tropics, 

 where they attain a length of 

 fifteen centimeters and are of 

 a dark brown color. Most 

 scorpions are much smaller, 

 however, like 

 our light brown 

 Florida species, 

 which is usually 



only six or seven centimeters long. They are nocturnal ani- 

 mals, living under stones and in holes or other dark plai 

 during the day and seeking their prey at night ; they feed prin- 

 cipally on spiders and insects, which they sting to death and 



