154 SCORPIONS, SPIDERS, AND TICKS 



tiped that is often found in dwellings, especially in the 

 South, is shown in Figure 91. It has long, many-jointed 

 antennse and fifteen pairs of legs. Some centipeds that 

 live in tropical countries are said to be very poisonous. 

 The poison glands open through the claws of the front pair 

 of legs. The centipeds live on insects, snails, etc. The 

 common one, figured, is harmless to people and does much 

 good by killing cockroaches and other insects that are 

 troublesome. 



Millipeds. — These differ from the centipeds in having 

 short antennse and in having two pairs of legs on all the 



Fig. 92. — Milliped common mider decaying logs. 



segments of the body except the first three. In most of 

 them the body is more rounded than that of a centiped. 

 The millipeds frequent damp places and, for the most part, 

 feed upon decaying vegetable matter. A certain blind 

 species lives in the Mammoth Cave. Occasionally, some 

 species work injury by eating garden vegetables. Some 

 of them, when disturbed, emit a strong odor from glands 

 opening along the sides of the body. This is evidently 

 a means of defense. These animals are perfectly harm- 

 less to man. 



