WHAT AN INSECT IS LIKE: OUTSIDE 



HEAD 



THORAX 



The head bears the eyes, the antennae and the mouth- 

 parts. The eyes are of two sorts: 



Compound eyes: a single large pair at the sides of the 

 head. If the surface of one of these be examined with a lens 

 it will be seen to be com- 

 posed of a multitude of 

 shining, transparent hex- 

 agonal facets. Each facet 

 bears a little lens through 

 which the light enters, 

 to reach the sensitive 

 nervous apparatus in- 

 side. Each unit of the 

 compound eye contri- 

 butes its own spot light, 

 giving inside what is 

 called a mosaic pattern. 

 This type of eye, so dif- 

 ferent from our own, is 

 believed to be especially 

 good for detecting mov- 

 ing objects. 



Simple eyes, or ocelli: 

 there are three of these 

 on the top of the head 

 between the compound 

 eyes, minute shining con- 

 vex spots, each with a single lenticular cornea; one ocellus 



ABDOMEN 



Fig. 2. 



-A diagram of the structure 

 of an insect. 



