Explanation of Plate XL 



Fig. 1. Amauris psyUalea. Section of brush near base of same 



showing " yellow " hairs, thick cu- 

 ticle and a few fine stifE hairs in 

 centre. 



2. „ „ Section at origin of dust hairs showing 



modification of cuticle where these 

 arise. 



3. „ „ More distal section, showing black 



hairs arising, and "yellow" hairs 

 surrounded by dense mass of dust 

 hairs. 



4. „ „ Portion of a section still nearer distal 



end. Black hairs are now more 

 numerous. 



5. „ „ Small area of a slide showing dust pro- 



duced by breaking up of dust hairs. 



(All X 50.) 



