OLFACTORY SENSE OF THE HONEY BEE 



327 



Fig. 18 Semidiagrammatic drawing reconstructed from fourteen consecutive 

 sections through the third leg of a 19-day-old worker pupa. The trochanter and 

 femur were bent at their articulation (ArtM) so that they formed an angle of 

 70 degrees; the sections pass obliquely through this articulation. The smaller 

 portion at the top is the trochanter, only the inner side of which is represented. 

 On this surface are shown groups 12, 13 and 15. The lower portion shows both 

 the inner and outer sides of the femur, group 6 being located on the outer side. 

 The internal parts show the innervation of the olfactory pores and the anatomy 

 of the leg at this place. Cross sections of muscle bundles (MB) are shown with 

 lines radiating from the muscle bundle nuclei {MBNuc), while longitudinal sec- 

 tions are represented by transverse lines. On account of the bend in the leg the 

 nerve (iV) is cut transversely in two places. 



In the wings of adult bees the nerve is easily traced from the 

 sense cells to the thorax. In one of the sections the innervation 

 is very plain. Here the sense fibers run from the pores to the 

 sense cells from which a nerve (fig. 22, N) proceeds all the way 

 to the thorax. 



The wing (fig. 22) arises at the bottom of a comparatively 

 large niche in the side of the thorax, then for a short distance it 



