OLFACTORY SENSE OF THE HONEY BEE 311 



Thus, for specimen No. 15, groups 1 to 6 are strictly definite 

 and constant. Group 7 is not always present, but it is definite 

 when found. Group 8 and groups 10 to 18 are always present, 

 and are scattered, groups 8, 14, and 15 being scattered most, 

 and they may vary slightly in position. Group 9 is found only 

 on the third leg, and it is scattered more than any other group. 



Variation 



The groups of pores differ in shape and size in the different 

 legs of the same individual, and different individuals show slight 

 variation in homologous groups. The following account gives, 

 the variations observed in the specimens examined. 



Wings of workers. Due to the wrinkled and folded condition 

 of many of the wings of all three castes, some of the groups were 

 not discernible and the pores of many groups could not all be 

 counted. For this reason the data for all the wings examined 

 can not be presented. However, all five groups are invariably 

 seen to be present when the preparations are good. These 

 groups vary considerably in number of pores. Group 1 varies 

 from 230 to 312, with an average of 260 for 10 wings. In three 

 cases this group had its broader ends divided into two branches. 

 Group 2 varies from 47 to 58, with an average of 53 for 13 wings. 

 Group 3 varies from 156 to 192, with an average of 172 for 15 

 wings. Group 4 varies from 76 to 86, with 81 as an average for 

 15 wings. Group 5 varies from 171 to 209, with 189 as an aver- 

 age for 9 wings. Thus on the front wing there is an average of 

 485 pores and on the hind wing 270, making 755 pores on both 

 wings of one side or 1510 on all four wings. 



Legs of workers. In examining nine legs of the third pair be- 

 longing to six workers, No. 6 is always present and it is double 

 in each case. In number of pores the smaller group varies from 

 8 to 10, and the larger group from 10 to 13, giving an average of 

 20 pores for No. 6. On the second leg this group is present on 

 only seven of the nine legs examined; it is single in each case, 

 but on three legs it is found on the inner instead of the outer 

 surface. Its pores vary from 6 to 20, with 18 as an average. 



