AROMATIC BUTTERFLIES 165 



the thortix, and with the two beautiful yellow anal 

 tufts of long hair distended to their fullest extent 

 at right angles to the body." So, too, in the 

 Heliconinae similar organs exist, and that in both 

 sexes, and the odor is described as of a disgusting 

 nature. The females of Melete and Callidryas, 

 genera of Pierinae, have similar organs in the 

 female, possessing a peculiar odor, and the males 

 of some species of Morphinae "are able to pro- 

 trude from the end of the abdomen a pair of 

 hemispherical bodies covered with short hairs 

 which produce a very distinct odor." So, again, 

 both sexes of a species of Didonis, one of the 

 Nymphalinae, protrude from the dorsal side of 

 the abdomen, between the fourth and fifth seg- 

 ments, hemispherical protuberances which have 

 a rather disagreeable and strong odor; and what 

 is the more remarkable, in addition to this, the 

 male of the same species has a second pair of 

 similar protuberances, between the fifth and sixth 

 segments, which are white and "emit an agreeable 

 odor, comparable to that of heliotrope." 



With the second group, where the odors have 

 their origin in tufts or pencils of hairs, the odors 

 at once change in general from a disagreeable to 

 a pleasant nature. In the Ithomyini, Fritz Miil- 



