308 



N. E. McINDOO 



B 



Q 



% 



Q) 



Por/lpHr 



Fig. 13 External view of olfactory pores and some spinelike hairs as they 

 appear on the third leg of a worker bee, X 465. A, from group 13; B, from 

 group 14; C, from group 15; D and E from groups 16 and 17 respectively; F, 

 from group 18, the two pores are drawn twice too close together. 



the largest of all and they do not vary greatly in size. They 

 are oblong and the long diameters are in some cases oblique 

 and in others transverse to the long axis of the tibia (fig. 12, E 

 and F). They lie in rather straight rows, along the long axis 

 of the leg. 



Groups 12 to 15 lie on the inner side of the trochanter (fig. 2). 

 Groups 12 and 13 are located at the distal end, with group 12 

 near the posterior edge and group 13 near the anterior. Group 

 14 lies on the inner side in a position near the anterior edge simi- 

 lar to that of group 8 on the outer side. Group 15 lies near 

 the posterior margin extending the full length of the trochanter 

 (figs. 12, G and 13, C). In these preparations occasionally one 

 end of the slits extends outside the pore wall {ForW). This 

 may be due to the treatment with caustic potash. 



