INSECT STRUCTURE. 



3 



If we take a caterpillar and examine it we find the following parts : 



The head is rounded, broadly attached to the body ; the mouth is 



situated on the lower side with a complex arrangement of jaws ; small 



FIG. 5. 

 Caterpillar. 



eyes are set in a half circle on each side of the head ; and we may dis- 

 cern a pair of small feelers called antenna. Behind the head are three 

 segments (a ring and the contents are called a segment), each having a 

 pair of small jointed legs below : there are short or long 1 hairs on each 

 segment, and the first segment often has a small oval shield just behind the 

 upper part of the head. These three segments together form the thorax. 

 Behind the thorax are eight segments (which form the abdomen), 



EYES. 



HEAD 



THORAX. ' 



ABDOMEN. 



MOUTH 



SPIRACLE. 



.SPIRACLE 



SUCKER FEET 



FIG. 6. 

 Diagram of Caterpillar, 



