CHAP. J. INTRODUCTION. 



11 



Flour-mites, Ticks, etc., which are provided with eight legs, as 

 the Red Spider (Fig. 5), 



III. CRUSTACEANS (Crustacea), such as Crabs, Lobsters, 

 Shrimps, etc., which have from ten to fourteen legs. 



IV. MYRIAPODS (Myriapoda), such as Centipedes, Milli- 

 pedes, etc., have more than fourteen legs, as the Julus (Fig. 6). 



V. WORMS (Annelida), such as Earth-worms (Fig. 7), 

 Leeches, etc., which are entirely destitute of legs. 



The greater number of 

 TRUE INSECTS (Insecta), 

 have the body divided 

 into three distinct regions 

 (Fig. 8, Daddy- Long - 

 legs ) ,which have received 

 the same names as the 

 corresponding parts in 

 the higher animals; thus, 

 the first region, or part, 

 is called the head (A); 

 the second part, the tho- 

 rax or chest (B); and the 

 hindermost division is 

 .termed the abdomen or hind bodv 



Fig. 8. 



It is among the true 



Fig. 10. 



insects alone that winged individuals occur, although all in- 

 sects are not provided with these organs. 



