166 AROMATIC BUTTERFLIES 



ler found a pencil or tuft of long hairs near the 

 front margin of the hind wings of the males which 

 emits a distinct and agreeable vanilla-like odor. 

 The same organs with the same odor are occasion- 

 ally found in some of the females, but the organs 

 are never so large nor the odor so strong. In 

 Prepona, one of the Nymphalinae, there is a tuft 

 of black hairs on the hind wings of the males 

 which possesses a distinct odor. The same odor 

 of vanilla comes, according to Wood-Mason, from 

 the scent-fans of a species of Thaumantis, a genus 

 of Morphinae, where they are situated in various 

 positions upon the upper surface of the hind 

 wings near the base. Similar tufts of hairs on 

 the wings of the males of a species of Catopsilia 

 are said by the same writer to smell like jasmine ; 

 while Mliller reports that in some of the higher 

 Hesperini he perceived a very faint odor issuing 

 from certain pencils of hairs which are found on 

 the hind tibiae of the males when they were ex- 

 panding, the pencil being ordinarily hidden in a 

 furrow on the ventral side of the body between 

 the thorax and abdomen. So, too, he found in 

 the males of a species of Melete, one of the Pi- 

 erinae, already referred to, a pencil of hairs not 

 retractile, protruding from the ventral side of the 



