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Beekeeping 



(9) mouth cavity, (10) epipharynx, (11) palpi, (12) antennae, 

 (13) various structures on the antennae, (14) caudal styles, 

 (15) organs on base of wings and on legs, and (16) on different 

 organs for different orders of insects. Notwithstanding this 

 assortment of theories, it is probably correct to state that 

 until recently it was the consensus of opinion that the ol- 

 factory organs are located on the 

 antennae. However, Mclndoo* 

 shows that if the antenna of the 

 honeybee are removed, the insect 

 still reacts to odor stimuli. It 

 is impossible to go into the de- 

 tails of this work here, but, in 

 brief, this author concludes that 

 certain sense organs located at 

 the bases of the wings, on the legs 

 and on the stings of females are 

 olfactory organs, named by him 

 olfactory pores. His work covers 

 not only a study of the structure 

 and distribution of these organs 

 but is supported by experimental 

 evidence, which is usually omitted 

 in other papers on this subject. 



The location of these organs is 



indicated on the diagrams from 



Diagram of dorsal Mclndoo's paper (Figs. 88 and 



view of worker, showing loca- gQ)^ the organs being indicated 



tion of groups of olfactory ^ ^j^^j^ ^^.^^ ^^^ ^^^ different 



groups being numbered (zi 

 groups in all, Nos. 19, 20, and 21 being on the sting and 

 not shown in the diagrams). The structure of a typical 

 olfactory pore is shown in Fig. 90. From the sense cell 

 {SC), a nerve fiber (SF) extends to the surface of the 

 body through the pore aperture {PorA'p), this aperture being 



Fig. 



' Mclndoo, N. E., 1914. The olfactory sense of the honey bee. 

 exp. zool., XVI, pp. 265-346. 



Jr. 



