86 



ANTBKNJS OF INSECTS. 



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

 the eyes, the antennas, 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 j and generally have the form of slender and 



FIG. 294 CAPRICORN BEETLE. 

 a, a, antennae. 



FIG. 295. PAUSSUS CORNU. 



flexible horns (Fig. 294, a a) ; but their conformation varies 

 much, especially amongst the males ; thus they sometimes 

 resemble feathers, sometimes saws ; at another time small bulbs 

 (Fig. 295) ; 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. 296. VARIOUSLY-FORMED ANTENNAE OF INSECTS. 



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

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



