CLASSIFICATION OF INSECTS. 



57 



Fig 



The 



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. cattie-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- 

 legged worms. The members of this class have a 

 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 



, , , 1 Fig. 32.— a millipede. 



are bent forward 



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 



\X 



Fig. 31. — A centipede. 



