ITS OUTER SKELETON. 



51 



closed they form an imperfect tube outside, the tongue, which, 

 according to Hermann Miiller, is probably suctorial. The labial 

 palps are protective and sensory. Lastly, the central part, or 

 tongue, is a split tube used for suction ; it is very long, so as to 



Fig. 23. Mouth-parts of Honey Bee. 



Fig. 23 A. Diagram of Mouth-parts of Honey Bee. 



