132 



ARTHROPODA 



The scorpions, usually with an elongated abdomen at the 

 end of which is a sting and the opening of a poison gland, 

 dwell in the warmer parts of our country and other tropical 

 regions. 



Myriapoda 



The members of this class are characterized by an 

 elongated body consisting of only two regions, the head 



FIG. 152. Scutigera forceps, a harmless centiped. Natural size. After Marlatt. 



and trunk. The latter bears one or two pairs of jointed 

 feet on each segment. They are divided into two groups, 



FIG. 153. A poisonous centiped from Texas. Half natural size. 



one of which, the centipeds, includes those forms having 

 a single pair of legs to each body segment, while the other ? 

 the millepeds, have two pairs of legs to each segment. 



