OLFACTORY SENSE OF THE HONEY BEE 309 



Groups 16 and 17 (figs. 2, 13, D and E) are similar to groups 

 10 and 11 except that they are on the inner side of the proximal 

 end of the tibia. 



Group 18 consists of two or three pores as large as those on 

 the tibia, which are found on the ventral side of the second and 

 third tarsal joints (fig. 2). These two pores and three hairs are 

 represented in figure 13, F, although in the drawing the relative 

 distance between the pores is reduced one-half. 



Group 19 is located on the shaft of the sting (fig. 14, A) and 

 its pores are greatly scattered, but most of them occur about 

 midway between the two ends. A few are present on the tip end 

 of the shaft (fig. 14, A, a), while three are located at the other 

 extreme end (fig. 14, A, 6) . This group contains 44 pores. Fig- 

 ure 14, B, shows the pores on the tip of the shaft with a high 

 magnification. The canal {PorCl) passes from the apertures 

 into the body cavity {BC) of the shaft. Snodgrass ('10) pre- 

 sents a similar drawing, although he represents too many pores 

 near the tip end of the shaft. Figure 14, C, represents a pore 

 from the tip end of the shaft at a and figure 14, D, two pores 

 from the point marked e in figure 14, A, with a still higher mag- 

 nification. Figure 14, E, represents five pores from the point 

 marked c. 



Group 20 occurs on the tip end of each lancet (fig. 14, A, Brh). 

 Here there are 10 pores and an equal number of barbs, the open- 

 ing of each pore being found at the base of a barb. With the 

 highest magnification it is plainly 'seen that the canal of the pore 

 runs into the body cavity of the lancet (fig. 14, F, BC). 



Group 21 lies on each lancet just behind the lowermost part 

 of the bulb of the shaft (fig. 14, A, d). It has 10 pores,^ which 

 vary considerably in size (fig. 14, G). 



The following differences were found in the various groups of 

 pores on the first and second legs of specimen No. 15: On each 

 of these two legs group 6 is a single group and has only 18 pores. 

 It does not lie quite so close to the posterior edge as on the third 

 leg. Group 7 is not found on the second leg, but on the first it 



2 The drawing (fig. 14, G) shows only eight of these pores. 



