328 



N. E. McINDOO 



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Fig. 19 Cross section (6 microns thick) through the base of a front wing of a 

 19-day-old worker pupa, showing the olfactory pores and sense cells belonging to 

 groups 1 and 2. The longer row of pores belongs to group 1. All parts were drawn 

 with aid of a camera lucida, except the pores (Por), hairs (Hr) and hypodermal 

 cell walls (HypCW). The correct number of pores is represented; the hairs are 

 drawn as they appear in another similar section, and the hypodermal cell walls 

 are represented only by fine lines. X 465. 



Fig. 20 Semidiagrammatic drawing from two sections showing the innerva- 

 tion of the three groups of pores on the front wing of an adult worker bee. The 

 longest row of pores is from group 1 and the shortest row is from group 2. The 

 portion showing groups 1 and 2 is from the left front wing and the portion showing 

 group 3 is from the right front wing of the same imago worker. X 185. 



