30 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8l 



Lepidopterous larvae can smell, but they do not have the so-called 

 olfactory organs such as pegs, pore plates, pit pegs, or end pegs like 

 or even similar to those of adult insects. Therefore, it is onlv reason- 



^*^«;^^' 



c 



Fig. 6. — Cross sections of wings and proboscis of Lepidoptera, showing in- 

 ternal anatomy of wings and olfactory pores. A, Semidiagraminatic drawing 

 from an oblique section through front wing of cabbage butterfly, showing 

 groups 2, s, and 4, of pores, sense cells (Sc), nerve (A^), and trachea {Tr) ; 

 X 100. B, Pores from wing of codling moth; X 500. C, A pore from proboscis 

 of codling moth ; X 500. 



Fig. 7. — Schematic drawing of wing of a male Satuniia pyri L., showing 

 innervation of olfactory pores (P) and other sense organs, including scattered 

 pores and various types of sense hairs. The black dots represent those on the 

 dorsal surface, and the circles, those on the ventral side. (Copied from 

 Priiffer (77).) 



able to suppose that the pores, called olfactory by the writer, act as 

 smelling organs. 



The olfactory pores of five specimens of each larval instar were 

 counted. Little or no difference in position and number of the pores 



