EXPLANATION OF PLATE XX. 
Fic. 1. Genital armature viewed from above with brushes in sttw: 
x 10. 
2. Diagram of hind-wing showing position of glandular patch. 
x1. 
3. Ordinary scales of wing. x 160. 
4. Scales on patch. x 160. 
5. Diagram of relative position of chitinous projections and 
their covering scales. x 300. 
Large hairs of brush with elongated cells attached. x 300. 
7. Transverse section of large hairs. x 750. 
. Longitudinal section of brush showing hairs arising from 
sockets. At left is shown a small portion of retractor 
muscle. x 135. 
Filamentous hairs breaking into fragments. x 750. 
10. Section of glandular wing patch parallel to plane of wing. 
x 450. 
11. Cells of central portion of brush bag producing filaments. 
x 300. 
12. Transverse section of wing patch at right angles to direction 
of nervure. x 300. 
13. Ditto in way of nervure showing accumulation of secretion. 
x 50. 
> 
oo 
52) 
