﻿196 
  

  

  PROCEEDINGS 
  OF 
  THE 
  FOURTH 
  ENTOMOLOGICAL 
  MEETING 
  

  

  With 
  regard 
  to 
  the 
  results 
  obtained 
  by 
  an 
  alteration 
  in 
  the 
  surface- 
  

   tension 
  (Series 
  7) 
  (Plate 
  XXXV), 
  an 
  addition 
  of 
  NaCl 
  was 
  made 
  in 
  two 
  

   cases 
  in 
  order 
  to 
  stimulate 
  oviposition, 
  it 
  having 
  been 
  previously 
  found 
  

   that, 
  generally 
  speaking, 
  mosquitos 
  readily 
  oviposit 
  in 
  a 
  salt 
  solution 
  of 
  

   low 
  strength, 
  sometimes 
  in 
  preference 
  even 
  to 
  distilled 
  water 
  [e.g., 
  in 
  

   series 
  2(a)]. 
  As 
  will 
  be 
  seen 
  Sodium 
  taurocholate 
  appeared 
  to 
  be 
  dis- 
  

   tinctly 
  better 
  than 
  Saponin 
  and 
  even 
  than 
  distilled 
  water. 
  

  

  With 
  regard 
  to 
  the 
  results 
  obtained 
  in 
  a 
  varying 
  temperature 
  (Series 
  

   8) 
  (Plate 
  XXXV) 
  it 
  is 
  open 
  to 
  question 
  how 
  far 
  they 
  have 
  been 
  

   correctly 
  represented 
  in 
  the 
  curves, 
  if 
  it 
  is 
  assumed 
  that 
  the 
  act 
  of 
  

   oviposition 
  is 
  more 
  or 
  less 
  dependent 
  on 
  a 
  differential 
  thermal 
  stimulus, 
  

   as 
  generally 
  no 
  three 
  temperatures 
  remained 
  constant 
  for 
  more 
  than 
  a 
  

   day. 
  It 
  would 
  appear, 
  however, 
  that 
  in 
  a 
  temperature 
  variable 
  between 
  

   23° 
  and 
  35°C, 
  almost 
  all 
  the 
  species 
  of 
  mosquitos 
  experimented 
  with 
  

   (the 
  notable 
  exception 
  being 
  Anopheles 
  rossi) 
  preferred 
  the 
  hottest 
  of 
  

   the 
  three 
  temperatures, 
  the 
  results 
  being 
  summarized 
  in 
  the 
  following 
  

   statement 
  : 
  — 
  

  

  The 
  oviposition 
  results 
  recorded 
  in 
  this 
  paper 
  may 
  be 
  correlated 
  

   with 
  the 
  observations 
  made 
  by 
  one 
  of 
  the 
  present 
  writers 
  on 
  the 
  effects 
  of 
  

   certain 
  of 
  these 
  substances 
  on 
  the 
  development 
  of 
  the 
  young 
  stages 
  of 
  

   Cidex 
  jatigans.* 
  P)ut 
  in 
  doing 
  so 
  it 
  should 
  be 
  remembered 
  that 
  as 
  the 
  

   layings 
  in 
  the 
  case 
  of 
  Culex 
  fatigans 
  were 
  exceedingly 
  few, 
  the 
  correlation 
  

   of 
  the 
  two 
  sets 
  of 
  observations 
  is 
  likely 
  to 
  leave 
  a 
  large 
  margin 
  of 
  error 
  

  

  