Explanation of Plate XVI. 



Fig. 1. Danaida chrysippus. Section of wing before emergence 



from pupa. On the right is the 

 diverticulum which, when invagi- 

 nated after emergence, forms the 

 scent pocket. (x75.) 



2. „ lotis. Section of brush near distal end. The dark 



spots here and there are particles of a 

 dried secretion. ( x 50.) 



3. „ ,, Section of wing pocket showing its spiral 



formation and deep glandular cells. 

 ( X 50.) 



4. Trepsichrois mulciber. Longitudinal section through ac- 



cessory vesicle of brush bag. 

 Note epithelium with many nuclei 

 and funnel -like sockets from which 

 arise delicate membranous tubes. 

 ( X 50.) 



5. „ „ Transverse section at base of brush 



bag. At lower right-hand side is 

 seen passage from same to acces- 

 4 sory vesicle. ( X 50.) 



6. „ ,, Longitudinal section at base of brush 



bag showing glandular cells and 

 funnel-shaped sockets of hairs. 

 ( X 50.) 



