38 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 65 



are insignificant, but the caste variations are sufficiently large to 

 indicate that queens and drones do not have as strong likes and 

 dislikes for foods as do workers. As an average for workers, there 

 are 48 pores on each tongue ; for queens, 32 pores ; and for drones, 

 31 pores. 



On the inner surface of each labial palpus (fig. 7, LbPlp) a group 

 of olfactory pores (Por)* extends entirely across the base of this 

 appendage. These groups are always present and the individual 

 variations are slight. As an average for workers, there are 34 pores 

 on each labial palpus ; for queens, 24 pores ; and for drones, 23 pores. 



On the inner surface of each maxilla (fig. 8, Mx) near the max- 

 illary palpus (MxPlp) there is a group of olfactory pores (Por). 

 This group is never absent and the individual variations in number 

 of pores in it are slight. As an average for workers, there are 28 

 pores on each maxilla ; for queens, 20 pores ; and for drones, 20 pores. 



A group of olfactory pores (figs. 9 C and 10, Por) is always 

 present on the cervical plate (CvPl). As an average for workers, this 

 group contains 26 pores ; for queens, 24 pores ; and for drones, 23 

 pores. 



A few olfactory pores were seen in each of the following places : 

 just inside the buccal cavity, on each side of the head, and on the base 

 of the scape of each antenna. 



Table IX is a tabulated summary of the disposition of the olfac- 

 tory pores herein discussed and those previously found elsewhere 

 on the honey bee by the writer. The plus sign, " +," means that 

 there were more than the number recorded. The single question 

 mark, " ?," means that the pores were estimated ; and the double ques- 

 tion mark, " ? ?," means that the numbers recorded were computed by 

 using the ratios of the total number of pores on the other mouth-parts 

 as a basis. 



It is thus seen that drones as an average have a few more than 

 2,948 olfactory pores ; workers a few more than 2,766, and queens a 

 few more than 2214 olfactory pores. 



In various papers the writer has shown experimentally that the 

 olfactory pores on the legs and wings of hymenopterous and coleop- 

 terous insects receive odor stimuli, and it is only reasonable to sup- 

 pose that the same organs on the mouth-parts perform the same or a 

 similar function, although we have no way of knowing whether 

 the sensation produced is that of smell or that of taste. Judging 

 from the anatomy of the organs, we are inclined to call the sensation 

 smell, but judging merely from the experiments to determine whether 



