THE OLFACTORY ORGANS OF LEPIDOPTERA 



N. E. McINDOO 

 Bureau of Entomology, Washington D. C. 



TEN FIGURES 



CONTENTS 



Introduction and methods 33 



The olfactory pores 35 



Disposition 35 



a. Bombyx mori 9 35 



b. Other species 38 



c. Generic, specific and sexual variations 41 



Structure 44 



a. External structure 44 



b. Internal structure 44 



The antennal organs 50 



Disposition 51 



Structure 52 



Summary 54 



Literature cited 54 



INTRODUCTION AND METHODS 



In the investigation herein recorded a careful study of the 

 morphology of the olfactory pores of Lepidoptera has been made 

 in order to determine whether these organs are better adapted 

 anatomically than the antennal organs to receive olfactory 

 stimuli. 



The investigators who have performed experiments on but- 

 terflies and moths with mutilated antennae have concluded 

 that these appendages bear the olfactory organs, regardless of 

 whether or not the antennal organs are anatomically fitted to 

 receive olfactory stimuli. Since these investigators failed to 

 study sufficiently the behavior of the insects investigated, it is 

 possible that the responses observed misled them in determining 

 the seat of the olfactory organs (see the author's paper, '14 c). 



33 



JOURNAL OF MORPHOLOGY, VOL. 29, NO. 1 



