ANATOMY AND PHYSIOLOGY 



97 



very little glycerine had been mixed (though Muscidae did not 

 object to the glycerine) and Forel found that ants ate unsus- 



FIG. 126. 



tb 



sc 



FIG. 127. 



Section through tongue of wasp, Vespa vulgaris. c, cuticula; g, gland cell; h, 

 hypodermis; n, nerve; ob, gustatory bristle; ph, protecting hair; sc, sensory cell; tb, 

 tactile bristle. After WILL. 



pectingly a mixture of honey and phosphorus until some of 

 them were killed by it. Under the same circumstances, man 

 would be able to detect the phosphorus 

 but not the glycerine. 



Location of Gustatory Organs. As 

 would be expected, the end-organs of 

 taste are situated near the mouth, com- 

 monly on the hypopharynx (Fig. 126), 

 epipharynx and maxillary palpi. On the 

 tongue of the honey bee the taste organs 

 appear externally as short setae (Fig. 

 127) and on the maxillae of a wasp as 

 pits, each with a cone, or peg, projecting 

 from its base (Figs. 128, 129). Similar 



t t j t an( J p J^VC beetl f oun d by 



_ ^ 



Packard on the epipharynx in most of the 



1-11 r 



manchbulate orders of insects. 

 Histology. The end-organs of taste arise from special 

 hypodermis cells, as minute setae or, more commonly, pegs, 

 8 



Tongue of honey bee, 



Apis mellifera. p, pro 

 tectmg bristles; s, ter- 



minai spoon; t, taste 



setae. After WILL. 



