OLFACTORY SENSE OF THE HONEY BEE 



329 



Fig. 21 Semidiagrammatic drawing from two consecutive sections of the hind 

 wing of an adult worker bee, showing the innervation of groups 4 and 5. The 

 longer row of pores is from group 5. The two groups of sense cells (SC) are drawn 

 only approximately in their proper places, for they actually lie slightly one above 

 the other; the trachea (Tra) is also shown slightly out of its normal position. 

 X 185. 



runs parallel with the side of the thorax to the top of the niche, 

 where it turns at tight angles away from the body. Since the 

 muscles that move the wing are attached only to the sides of the 

 thorax at the lowest part of the wing, muscular tissue is never 

 seen in sections of the wings. The large tracheal branch (fig. 

 22, Tra) in the wing is also easily traced from the thorax to the 

 sense cells, although a short distance from the thorax it is cut 

 obliquely into small pieces. Its small branches near the sense 

 cell groups are usually cut transversely but sometimes obliquely. 

 These branches do not follow a straight path and do not extend 

 farther into the wing than the sense cells. Tracheal branches 

 do not persist in any of the veins or even between the articular 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 16, NO. 3 



