﻿Explanation 
  of 
  Plate. 
  

  

  Fig. 
  20. 
  Hydroptila 
  madachlani. 
  A 
  scent-scale 
  from 
  lobe. 
  Length 
  

   •015 
  mm. 
  

  

  21. 
  Hydroptila 
  femoraUs. 
  Head 
  with 
  brushes 
  partly 
  expanded. 
  

  

  Width 
  across 
  eyas 
  '473 
  mm. 
  

  

  22. 
  Part 
  of 
  a 
  brush 
  hair. 
  Width 
  across 
  points 
  -003 
  mm. 
  

  

  23. 
  Hydroptila 
  madachlani. 
  Section 
  through 
  lobe, 
  etc., 
  show- 
  

  

  ing 
  glandular 
  base. 
  Length 
  from 
  point 
  of 
  membrane 
  to 
  

   point 
  of 
  lobe 
  -105 
  mm. 
  

  

  24. 
  Hydroptila 
  femoralis. 
  Transverse 
  section 
  of 
  hair. 
  Diameter 
  

  

  •0015 
  mm. 
  to 
  -0037 
  mm. 
  

  

  25. 
  Section 
  through 
  head. 
  Width 
  across 
  eyes 
  -55 
  mm. 
  

  

  26. 
  Diagrammatic 
  figure 
  representing 
  about 
  the 
  natural 
  size 
  of 
  

  

  H. 
  femoralis. 
  

  

  