2 2 The Honey-Makers 



Beneath the maxillae lies the lower hp. This is composed 

 in part of two four-jointed organs, the labial palpi {LP). 

 Like the maxillse the palpi have two large horny joints (i, 2), 

 but they also have two short joints (3, 4), which possess 

 sensitive hairs, and, in short, are " feelers." 



The two palpi he side by side, their inner edges overlap- 

 ping underneath the tongue, so that, like the maxilte, they 

 form a partial tube. 



Thus, where the proboscis is let down but not lengthened 

 it is a short tube, closed above by the maxilte, below by 



the palpi. When by a remarkable contrivance the labial 

 palpi are extended beyond the maxillce, the proboscis is 

 lengthened but is no longer a complete tube, since, de- 

 prived of the roof formed by the maxillae, it is open above. 



