140 PHYSIOLOGY OF INSECTS. 



1. Caput or head A B 



2. Prothorax C D 



3. Mesothorax E F 



4. Melathorax G H 



5. Propodeon I J 



6. Podeon K L 



7. Melapodeon M N 



8. Octoon , O P 



9. Ennaton Q R 



10. Decaton S T 



11. Protelnm U F 



12. Paratelum WX 



13. Telum Y Z 



Propedes or forelegs a 



Proalae or fore wings e 



Mesopedes or middle legs i 



Metalae or hind wings o 



Metapedes or hind legs u 



Antennae y 



In each of the segments the Roman capital letter refers 

 to the upper surface, and the Italic letter to the lower. 

 With the exception of the first the segments have no 

 English names, the Latin ones are therefore universally 

 employed, and this is preferable to burthening the mind 

 with two names for the same part. 



The first segment is the head; it consists of a skull in 

 which are situated two feelers or antennae, two eyes and a 

 mouth, and frequently three additional eyes or ocelli. The 

 use of eyes and mouth are too obvious to require comment, 

 but that of the feelers is not fully known ; it is very cer- 

 tain that in the majority of insects they are organs of 

 touch, but in some large tribes, for instance the moths, 

 we never see them used for such a purpose, and yet their 

 very perfect organization in this tribe would lead us to 

 believe that they answer some important purpose in the 



