344 THE SENSORIAL FUNCTIONS. 



being superseded by the palpi, which are situated 

 near the mouth. When insects are walking, the 

 palpi are incessantly applied to the surface on 

 which they advance, as if these organs were em- 

 ployed to feel their way.* There can be little doubt, 

 however, that, in most insects, the principal organs 

 of touch are the Antennce, also denominated, from 

 their supposed office, the/eelers.^ 



Some idea of the great variety in the forms of 

 the antennae of insects may be obtained from the 

 specimens delineated in Fig. 381, which shows a 

 few of the most remarkable.f 



The universality of these organs among every 

 species of this extensive class of animals, their 

 great flexibility, arising from their jointed struc- 



* The more special function of the palpi is to examine the sub- 

 stances used for food, before they are taken into the mouth. 



t The German name for them, fiihlhorner, or the feeling horns, 

 is founded on the same notion. 



I In this figure, A represents the form of an ten nee, technically 

 denominated Anten7ia capitulo uncinato, as exemplified in the 

 Pausus. 



B. is the A. piloso-verticillata, as in the Psychoda ocellaris. 



C. .A. biclavata ( Claviger longicornis ) . 

 D..A. triangularis, (Lophosia). 

 E..A. clavata, ( Masaris). 



F..A. capit lamellato, ( Melolontha mas). 

 G..A. capit. fissile, ( Aphodius fossor ) . 

 H..A. fusiformis, (Zygcena). 

 I, .A. capitata, (Ascalaphus). 

 K..A. furcata, ( Schizocerus furcatus ) : 

 L. .A. bipectinata, (Ctenophora). 

 M..A. irregularis, ( Agaon paradoxum). 

 N. . A. cordata, ( Diaperis boleti). 

 O. .A. bipectinata, ( Bombyx). 

 P.. A. palmata, (Nepa cinerea). 

 Q..A. ensiformis, (Truxalis). 

 R..A. setacea, (Cerambyx). 



I 



