CLASS INSECTS. 



407 



The head is formed of a single segment, and carries the 

 eyes, antennae, and appendages of the mouth. The antennae 

 constitute the first pair of the members or appendages of 

 insects, and are composed of a number of joints placed one 

 before the other. They arise from the anterior or superior 



Fig. 417. Capricorn of the Alps. 



Fig. 418. Horny Paussus. 



part of the head, and affect in general the form of flexible 

 slender horns (# , Fig. 417) ; but their conformation varies, 

 especially in the males. In some they resemble feathers 

 (Fig. 419) ; sometimes saws and little clubs (Fig. 418); and 

 occasionally they are formed of little lamellae, like the leaves 



Fig. 419. Small Bombyx (Paon de Nuit} ; Emperor Moth. 



of a book (Fig. 421). Their length is sometimes very con- 

 siderable. Of their use nothing is known for certain ; but 

 they may serve for feeling or even hearing. 



Three pairs of other appendages arise from the lower part 



