168 AROMATIC BUTTERFLIES 



and an erectile wliisp of hairs on the hind wings 

 of the male. This, he says, comes from a fluid 

 secreted by these scales or hairs, the only instance 

 in wliich such a secretion has been noted ; but 

 this pleasant odor, he adds, is so faint " as barely 

 to be perceptible in the presence of a much 

 stronger odor (resembling that of sable fresh 

 from the furrier's shop) which is common to the 

 two sexes," but which is not localized. In the 

 neighboring gi-oup of Brassolinae, spots of pe- 

 culiar scales are very often present on the hind 

 wings, and Miiller observed that very distinct 

 odors were emitted from these spots in several 

 different genera, particularly in Dasyophthalma. 

 So, too, he noted that a rather strong odor was 

 given off from a species of Ageronia, one of the 

 Nymphalinae, by two large brown spots situated 

 between the wings where they oppose each other, 

 though in other allied species of the same genus 

 neither the odor nor the patch could be detected. 

 A most curious instance is that of the species of 

 Didonis, already mentioned, where abdominal 

 glands occur in both sexes and even a second pair 

 in the male, one with agreeable and one with 

 disagreeable odor, a butterfly which is still further 

 beperfumed, since Miiller was able to detect a 



