NO. 14 SENSE ORGANS ON MOUTH-PARTS OF BEE — McINDOO 



27 



the nerve are given off now and then which run toward the sense cells, 

 but the actual connection of them with the cells was not observed. 

 The internal anatomy of the tongue is best understood by referring 

 to the semidiagrammatic figure 3 A and B. Figure 3 A is through the 

 middle of the tongue, while 3 B is through the tip. 



(b) PEGLIKE HAIRS 



Two varieties of peg-shaped hairs occur on the maxillae and labial 

 palpi. To compare them with those found on the antennas, two of the 

 latter have been drawn. 



Variety d. Figure 4 A and B represent the smallest and largest 

 pegs seen on the flagellum of a worker bee. The chitin at the tips is 

 about as thick as elsewhere. Other observers state that the chitin at 

 the tips of these hairs is much thinner than elsewhere. This is ap-- 



Fig. 4. — Internal anatomy of varieties d, e and / of peglike, innervated hairs 

 of worker honey bees, x 580. A, smallest and B, largest of pegs on flagella of 

 antennae ; C from maxilla ; D from labial palpus ; E from outer surface near 

 tip of maxilla. These hairs, except di and dz, may be located by referring to 

 figures 7 and 8. 



parently true when a bright light is used, for the chitin is so nearly 

 transparent at the tip that it appears thinner than where it is darker. 

 When these hairs are carefully observed through the highest lenses 

 and with less light, it seen that the chitin at their tips is about as thick 

 as at their bases. 



Variety e. The peglike hairs on the maxillae (figs. 4 C, 7 and 8, e^) 

 and labial palpi (4 D and 8, e 2 ) are similar in structure to those on 

 the antennae. The following slight differences may be pointed out. 

 Those on the mouth-parts are never so large as those on the antennae. 

 Their tips are less blunt and their sockets project slightly above the 

 surface of the chitin, while the sockets of those on the antennae lie a 

 little below the external surface of the chitin. 



Variety f. These are found on the distal ends of the maxillae and 

 labial palpi (figs. 7 and 8, /). They are long and slender, usually 



