86 



ANTENNJE OF INSECTS. 



662. The head is formed only by a single piece ; and bears 

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

 antennce constitute the first pair of members or appendages of 

 Insects; and are composed of a considerable number of small 

 joints placed end to end ; they arise from the anterior or superior 

 part of the head ; and generally have the form of slender and 



FIG. 394. CAPRICORN BEETLE. 

 a, a, antenna?. 



FIG. 395. PAUSSUS CORNU. 



flexible horns (Fig. 394, a a) ; but their conformation varies 

 much, especially amongst the males ; thus they sometimes 

 resemble feathers, sometimes saws ; at another time small bulbs 

 (Fig. 395) ; and in other instances they are terminated by an 

 enlarged part composed of layers placed like the leaves of a book. 

 Their length is sometimes very considerable. "We know nothing 

 positive regarding their use; but it is supposed that they are 



FIG 396. VAKIOUSLY-HORMKD ANTKNNJE OF INSECTS. 



organs of feeling, and perhaps also of hearing (ANIM. PHYSIOL. 

 498). Other appendages, to the number of three pairs, spring 





