THE CEPHALO-8TEBNUM. 95 



such insects as the male Kentish Glory moth to its female, 

 which may be miles away, their power of appreciating odors 

 would be little adapted for an insect when in the near vicinity 

 of putrid carrion. The palpi, as has been already remarked, 

 are probably gustatory organs, whilst I think it very probable 

 that the frontal sac, the nerve supply of which is far more 

 limited, and the structure of which is far coarser, is 

 especially adapted for the appreciation of more powerful 

 odors. 



Section XVII. The Gephalo-Stcrnum. 

 PLATE V., FIGS. 89, AND PLATE VIII., Fio. 16. 



The relations and position of this organ have been suffi- 

 ciently described.* Its blades are covered with numerous 

 sharp hairs or seta3. I can suggest no function which it is 

 likely this remarkable organ subserves. Its blades are not 

 more than l-200th of an inch in diameter, so that it can hardly 

 be concerned in the sound emitted by the insect when the head 

 is rubbed against the thorax, nor does its position seem adapted 

 to such a purpose. The only evidence that it is an organ of 

 special sense is that its inner surface is covered with nerve 

 cells. 



* Section VI., page 60. 



