50 



N. E. McINDOO 



(N), runs to the hypodermis (figs. 7 and 9 B), and then divides 

 into nerve fibers which unite with the sense cells. 



Figure 9 C is similar to figure 6 A, but represents a section 

 cut obliquely through the base of the front wing of a butterfly, 



mm^ 



Fig. 9 Cross sections of wing and leg of cabbage butterfly, Pontia (Pieris) 

 rapae, showing internal anatomy of these appendages at positions where olfac- 

 tory pores are located. A, from front wing and B, from trochanter, X 506. 

 C is a semidiagrammatic drawing from an oblique section cut in direction of line 

 a in figure lA and B, showing groups nos. 2, 3 and 4, of olfactory pores, X 106. 

 C, costa; D, dome; HrSk, hair socket; Hyp, hypodermis; M, media; N, nerve: 

 NB, nerve branch; R, radius; SC, sense cell; Sc, subcosta; Tr, trachea. 



Pontia, in the direction of the line a in figure 1 A and B. The 

 section passed through groups nos. 2, 3 and 4 and longitudinally 

 through the nerve (N) for a short distance. 



THE ANTENNAE ORGANS 



Several investigators have studied the morphology of the 

 antennal organs in Lepidoptera, but since Schenk's work ('02) 



