122 



THB BEB-KBEPBR'S GtriDE ', 



rapid vibration of their large, heavy wings. lyandois showed 

 many years since, that the hum of bees and other insects, was 

 due first to vibrations of wings, secondly to vibrations of the 

 abdominal rings, and, thirdly, to what he styled true voice in 

 the thoracic spiracles, where there are cavities which he 

 thought were voice cavities. He thought the humming tone of 

 bees and other insects came from the spiracles. The drone's 

 flight is more heavy and lumbering than that of the workers. 

 Their ligula (Fig. 49), labial palpi and maxillae — like the same 



Fig. 46. 



(OrigiuaJ.) 

 Fig. 47. 



Drone-Bees, magnified, from 

 Xewman, 



Fig. 48. 



in the queen-bee — are short, while their jaws (Fig. 65, a) pos- 

 sess the rudimentary tooth, and are much the same in form as 

 those of the queen, but are heavier, though not so strong as 

 those of the workers. Their eyes (Figs. 3, 47) are very promi- 

 nent, meet above, and thus the simple eyes are thrown for- 



