Explanation of Plate XIII. 



Fig. 1. Amauris hecate. Section of brush near base. Central 

 bodies, surrounded by " yellow "' hairs, 

 are seen. 



2. „ „ More distal section. Central bodies have 



almost disappeared. At upper right 

 side are seen rather indistinct structures. 

 These are the hairs which ultimately 

 form the dust. 



3, 4, 5. „ „ Further sections showing the arising of 



the black hairs and the development of 

 the dust hairs, many of which, in figs. 4 

 and 5, show a renif orm section. 

 6. „ „ Longitudinal section of cuticle of brush 



bag at origin of black hairs. 



(All X 50.) 



