58 



TEXT-BOOK OF ENTOMOLOGY 



while in Otiocerus, two long processes arise from the base, giving it 

 a trifid shape. In dragon-flies and cicadas, they are minute and 

 hair-like, though jointed, while in the larvae of many metabolous 



Fi<;. 43. Different forms of antennae of beetles : 1, serrate ; 2, pectinate ; 3, capitate (and also 

 geniculate) ; 4-7, clavate ; 8, 9, lamellate ; 10, serrate (Dorcatoma) ; 11, irregular (Gyrinus) : VI. t\vu- 

 jointed antenna of Adranes ccecus. After LeConte. a, first joint of flagellum of antenna of Tract tat 

 silvarum ; b, of T. divinatorius, After Kolbe. 



insects they are reduced to minute three-jointed tubercles. In 

 aquatic beetles, bugs, etc.. the antennas are short, and often, when 

 at rest, bent close to the body, as long antennas would impede 

 their progress. 



While usually more or less sensorial in function, 

 Graber states that the longicorn beetles in walking 

 along a slender twig use their antennas as a rope- 

 dancer does his balancing pole. 



Eecent examination of the sense-organs in the 

 antennae of an ant, 

 wasp, or bee enables 

 us, he says, to realize 

 what wonderful or- 

 gans the antennas are. 

 In such insects we 

 have a rod-like tube 

 which can be folded 

 up or extended out 



FIG. 44. Tripec- . 



tinalr antenna ..I an lllto Space, Containing 

 Australian moth. 



the antennai nerve, 

 which arises directly from the brain and sends a branch to each of 

 the thousands of olfactory pits or pegs which stud its surface. The 

 antenna is thus a wonderfully complex organ, and the insect must 



Fl<;. 4"). Antenna of Tulnrm-era ui- 

 its, tf. After WIliMon. 



