CLASSIFICATION OF INSECTS. 



57 



often attract attention on account of their red color, 

 and other species are often found para- 

 sitic on insects. The annoying para- 

 sites that are known as ticks (Fig. 30), 

 and which are common in the warmer 

 parts of our country, are mites. The 

 sheep-tick, however, is a wingless fly. 



FIG. 30. The 

 cattle-tick, female. 



Class MYRIAPODA (Myr-i-ap'o-da). 

 The Myriapods (Myr'i-a-pods). 



This class includes the centipedes and the milli- 

 pedes, both of which are commonly called thousand- 

 lep-g-ed worms. The members of this class have a 



o o 



distinct head which bears a single pair of antennae. 



The body is long, and 

 consists of similar seg- 

 ments, which are not 

 grouped into regions, 

 and each segment of 

 the body bears one or 

 two pairs of legs. 

 The centipedes (Fig. 31) have only a single pair 



of legs to each segment. Representatives of many 



species of these are common. The poison glands 



open through the 



claws of the first 



pair of legs, which 



are bent forward 



FIG. 31. A centipede. 



FIG. 32. A millipede. 



so as to act with the mouth-parts. The centipedes 

 feed on insects. 



The millipedes (Fig. 32) differ from the centipedes 

 in having two pairs of legs on each of the body seg- 

 ments except the first three. The millipedes, as a 



