OLFACTORY ORGANS OF LEPIDOPTERA 



47 



insects. The nerve fibervS (fig. 5 A, NF) run directly to the 

 nerves which he surrounded by blood and the tracheae (Tr.) 

 The sense fibers (fig. 5 D and E, SF) are easily traced to the cones, 

 but seldom through them. Sometimes they are surrounded by 



B 



Fig. 6 Semidiagrammatic drawings of cross sections of wings of Bombyx 

 mori, showing internal anatomy at bases of wings and groups nos. 2, 4, 6 and 7 

 of olfactory pores, X 80. A, from front wing and B, from hind wing. BlSin, 

 blood sinus; C, costa; M, media; N, nerve; NF, nerve fiber; P, isolated olfactory 

 pore on costa; R, radius; SC, sense cell; Sc, subcosta ;.Tr, trachea. 



the hypodermal secretion (fig. 8 A, C and D, HypS) which has 

 formed the cones. 



To understand the anatomy of the wings at the position where 

 the olfactory pores are located, the reader is referred to figure 

 6 A and B, which are semidiagrammatic drawings taken from 

 sections across the bases of the wings, A being from the front 



