﻿321 
  

  

  THE 
  COMPARATIVE 
  MORPHOLOGY 
  OF 
  THE 
  ANOPHELINES 
  

   NYSSOMYZOMYIA 
  LUDLOWI, 
  THEO., 
  AND 
  N. 
  ROSSI, 
  GILES. 
  

  

  By 
  C. 
  Strickland, 
  M.A., 
  B.C., 
  

   Travelling 
  Medical 
  Entomologist, 
  Federated 
  Malay 
  States. 
  

  

  (Plates 
  XXXII 
  and 
  XXXIII.) 
  

  

  As 
  some 
  confusion 
  exist 
  in 
  the 
  minds 
  of 
  medical 
  men 
  in 
  the 
  Malay 
  States 
  as 
  to 
  

   the 
  differentiation 
  of 
  the 
  Anophelines 
  ludlowi 
  and 
  rossi* 
  it 
  is 
  probably 
  worth 
  while 
  

   to 
  give 
  the 
  following 
  comparative 
  notes 
  of 
  the 
  two 
  species, 
  particularly 
  as 
  

   I 
  believe 
  that 
  the 
  larva 
  of 
  ludlowi 
  has 
  been 
  previously 
  held 
  to 
  be 
  indistinguishable 
  

   from 
  rossi, 
  whereas 
  it 
  is 
  in 
  reality 
  very 
  distinct. 
  

  

  The 
  material 
  was 
  taken 
  at 
  Morib, 
  Selangor, 
  to 
  which 
  place 
  I 
  was 
  sent 
  in 
  

   connection 
  with 
  an 
  outbreak 
  of 
  fever; 
  and 
  the 
  figures 
  have 
  been 
  drawn 
  with 
  the 
  

   aid 
  of 
  a 
  camera 
  lucida 
  attached 
  to 
  a 
  Zeiss 
  binocular 
  dissecting 
  microscope. 
  

  

  The 
  Egg. 
  

  

  The 
  egg 
  was 
  studied 
  in 
  specimens 
  both 
  laid 
  by 
  mosquitos, 
  and 
  taken 
  from 
  their 
  

   ovaries 
  when 
  ripe. 
  

  

  In 
  estimating 
  the 
  comparative 
  size 
  of 
  ova 
  it 
  must 
  be 
  borne 
  in 
  mind 
  that 
  when 
  

   using 
  the 
  microscope 
  optical 
  sections 
  at 
  the 
  same 
  plane 
  must 
  be 
  compared. 
  

  

  Fig. 
  1. 
  Eggs 
  of 
  : 
  a, 
  Nyssomyzomyia 
  ludlowi 
  ; 
  b, 
  N. 
  rossi. 
  

  

  Perhaps 
  the 
  best 
  way 
  to 
  effect 
  this 
  is 
  to 
  rack 
  the 
  focussing 
  adjustment 
  up-and-down 
  

   until 
  the 
  greatest 
  length 
  of 
  the 
  opaque 
  part 
  of 
  the 
  egg 
  is 
  seen 
  in 
  the 
  species 
  to 
  be 
  

   compared 
  ; 
  the 
  frilled 
  cuticle 
  can 
  be 
  disregarded 
  because 
  it 
  seems 
  to 
  be 
  variable 
  

  

  * 
  Our 
  so-called 
  rossi 
  may 
  prove 
  to 
  be 
  distinct 
  from 
  rossi, 
  Giles. 
  

  

  (C120) 
  

  

  