﻿PROCEEDINGS 
  OF 
  THE 
  FOURTH 
  ENTOMOLOGICAL 
  MEETING 
  213 
  

  

  the 
  primitive 
  species 
  of 
  each 
  region 
  occur, 
  these 
  being 
  much 
  more 
  like 
  

   each 
  other 
  than 
  are 
  those 
  occurring 
  in 
  geographical 
  proximity. 
  There 
  

   appears 
  therefore 
  to 
  have 
  been 
  a 
  pushing 
  out 
  from 
  a 
  centre 
  of 
  distribution 
  

   towards 
  the 
  middle 
  of 
  the 
  Malayan 
  Archipelago, 
  whose 
  luxuriant 
  jungles 
  

   are 
  noted 
  for 
  their 
  great 
  wealth 
  of 
  different 
  species. 
  There 
  have 
  been 
  

   some 
  barriers 
  to 
  distribution 
  which 
  have 
  checked 
  this 
  centrifugal 
  ten- 
  

   dency 
  at 
  various 
  points, 
  such 
  as 
  Palk 
  Straits, 
  the 
  Gangetic 
  plains 
  and 
  the 
  

   Isthmus 
  of 
  Kra. 
  Certain 
  groups 
  of 
  Arachnida 
  follow 
  in 
  the 
  main 
  this 
  

   distribution 
  but 
  often 
  their 
  case 
  is 
  very 
  complex. 
  Certain 
  Malaysian 
  

   spiders 
  extend 
  into 
  the 
  Eastern 
  Himalayas 
  but 
  not 
  into 
  Peninsular 
  

   India. 
  Others 
  of 
  the 
  genus 
  may 
  occur 
  in 
  Peninsular 
  India 
  but 
  not 
  in 
  ' 
  

   the 
  Himalayas. 
  

  

  I 
  do 
  not, 
  of 
  course, 
  ascribe 
  distribution 
  in 
  all 
  cases 
  to 
  air 
  currents, 
  Mr. 
  Fletcher, 
  

   which 
  cannot 
  have 
  much 
  effect 
  on 
  heavy 
  insects 
  such 
  as 
  the 
  Passalids, 
  

   but 
  certainly 
  they 
  play 
  a 
  large 
  part 
  generally. 
  Even 
  neglecting 
  trans- 
  

   port 
  across 
  wide 
  stretches 
  of 
  ocean 
  by 
  the 
  upper 
  air 
  currents, 
  many 
  

   insects 
  can 
  fly, 
  or 
  are 
  carried 
  by 
  the 
  wind, 
  to 
  quite 
  unexpectedly 
  long 
  

   distances. 
  When 
  I 
  was 
  in 
  a 
  Survey 
  Ship 
  off 
  the 
  coast 
  of 
  Ceylon, 
  we 
  

   were 
  running 
  lines 
  of 
  soundings 
  every 
  quarter 
  of 
  a 
  mile 
  along 
  the 
  

   coast 
  out 
  from 
  the 
  beach 
  to 
  the 
  100 
  fathom 
  limit 
  and 
  each 
  night 
  we 
  

   anchored 
  wherever 
  we 
  happened 
  to 
  be 
  on 
  our 
  line 
  when 
  it 
  became 
  

   too 
  dark 
  to 
  see 
  our 
  shore 
  marks 
  ; 
  often 
  we 
  were 
  10 
  to 
  12 
  miles 
  from 
  

   the 
  coast. 
  It 
  was 
  surprising 
  to 
  note 
  how 
  many 
  insects 
  came 
  to 
  the 
  

   lights 
  of 
  the 
  ship, 
  and 
  these 
  included 
  many 
  small 
  things, 
  which 
  one 
  

   would 
  think 
  could 
  not 
  fly 
  half-a-mile. 
  In 
  America 
  experiments 
  have 
  

   been 
  done 
  by 
  exposing 
  sticky 
  screens 
  at 
  light-houses 
  off 
  shore 
  and 
  it 
  

   has 
  been 
  found 
  that 
  young 
  Coccids, 
  caterpillars, 
  etc., 
  are 
  carried 
  to 
  

   unexpectedly 
  great 
  distances 
  by 
  the 
  wind, 
  — 
  something 
  like 
  27 
  miles, 
  

   I 
  think. 
  

  

  Is 
  there 
  any 
  indication 
  of 
  the 
  distribution 
  of 
  Anophelines 
  being 
  Mr. 
  Sen. 
  

   correlated 
  with 
  mammalian 
  feeding 
  habits 
  ? 
  

  

  General 
  experience 
  shows 
  that 
  Anopheline 
  distribution 
  is 
  affected 
  Major 
  Christo- 
  

   primarily 
  by 
  the 
  presence 
  of 
  suitable 
  breeding 
  places. 
  With 
  the 
  excep- 
  

   tion 
  of 
  certain 
  species, 
  e.g., 
  Stom.yia 
  fasciata, 
  which 
  is 
  definitely 
  associated 
  

   with 
  man, 
  mosquitos 
  are 
  not 
  usually 
  specific 
  in 
  their 
  choice 
  of 
  a 
  mam- 
  

   malian 
  host. 
  

  

  Whilst 
  collecting 
  on 
  a 
  tame 
  bull 
  at 
  Coonoor 
  I 
  found 
  that 
  several 
  Mr. 
  White, 
  

   persons 
  standing 
  around 
  the 
  animal 
  were 
  not 
  bitten 
  by 
  Ano'pheles 
  gigas, 
  

   A. 
  aitJceni, 
  Stegomijia 
  frilmeata, 
  a 
  Simidium 
  and 
  a 
  CuUcoides. 
  Neither 
  

   were 
  we 
  bitten 
  by 
  these 
  insects 
  whilst 
  collecting 
  around 
  the 
  garden, 
  wait- 
  

   ing 
  for 
  the 
  bull 
  to 
  be 
  brought 
  up. 
  I 
  know 
  two 
  rest 
  houses 
  in 
  Ceylon 
  

   both 
  situated 
  deep 
  in 
  the 
  same 
  jungle, 
  near 
  one 
  of 
  which 
  there 
  is 
  a 
  

  

  