XYIII. 



AROMATIC BUTTERFLIES 



Fritz Muller, a naturalist who has done 

 much by his researches in various fiekls to bring- 

 new evidence in support of Darwin's theory, as- 

 tonished the entomological world some years ago 

 with a long list of odors emitted by butterflies 

 and moths. It had been known for a long time 

 that certain butterflies had peculiar odors, but 

 no one imagined the extent and variety of this 

 peculiarity. And indeed this is not altogether 

 strange, since the cases known up to the present 

 time are largely drawn from tropical butterflies, 

 and the odor is always lost after death, and in 

 many cases is exceedingly faint and fleeting. The 

 study of the apparatus through which the odors 

 are emitted shows that three classes of organs are 

 involved in their production, and the variation in 

 intensity of odor in diiferent creatures leads to 

 the very reasonable belief that the identical organs 

 found in an immense number of butterflies where 



