﻿91 
  

  

  ON 
  THE 
  OCCURRENCE 
  OF 
  STEGOMYIA 
  FASCIATA 
  IN 
  A 
  HOLE 
  IN 
  A 
  

  

  BEECH 
  TREE 
  IN 
  EPPING 
  FOREST. 
  

  

  By 
  Captain 
  M. 
  E. 
  MacGregor, 
  R.A.M.C., 
  

  

  Officer 
  in 
  charge 
  of 
  the 
  Entomological 
  Laboratory, 
  Sandwich, 
  Kent. 
  

  

  For 
  the 
  last 
  few 
  months 
  I 
  have 
  been 
  using 
  a 
  beech 
  tree-hole 
  in 
  Epping 
  Forest 
  

   as 
  a 
  source 
  of 
  supply 
  of 
  Anopheles 
  plumbeus 
  ; 
  and 
  it 
  has 
  been 
  our 
  custom 
  to 
  collect 
  

   larvae 
  from 
  the 
  hole 
  and 
  transfer 
  them 
  to 
  the 
  laboratory 
  at 
  Sandwich, 
  where 
  the 
  

   development 
  is 
  continued 
  under 
  artificial 
  conditions. 
  In 
  this 
  way 
  we 
  have 
  been 
  

   able 
  to 
  obtain 
  large 
  numbers 
  of 
  Anopheles 
  plumbeus 
  and 
  Ochlerotatus 
  geniculatus, 
  

   together 
  with 
  the 
  recently 
  discovered 
  Orthopodomyia 
  albionensis 
  * 
  as 
  an 
  associate. 
  

   Not 
  long 
  after 
  finding 
  the 
  Orthopodomyia, 
  I 
  was 
  surprised 
  to 
  find 
  yet 
  another 
  species 
  

   from 
  the 
  same 
  tree-hole, 
  two 
  male 
  Stegomyia 
  fasciata 
  emerging 
  from 
  the 
  tank 
  

   containing 
  the 
  mixed 
  larvae 
  from 
  Epping 
  Forest. 
  The 
  specimens 
  were 
  of 
  normal 
  

   size, 
  and 
  we 
  now 
  have 
  them 
  preserved 
  in 
  our 
  collection 
  here. 
  

  

  As 
  is 
  well 
  known, 
  Stegomyia 
  fasciata 
  has 
  been 
  brought 
  to 
  England 
  for 
  experimental 
  

   purposes, 
  and 
  has 
  been 
  kept 
  breeding 
  in 
  captivity 
  by 
  several 
  workers 
  for 
  some 
  

   years. 
  It 
  is 
  therefore 
  probably 
  accounted 
  for 
  in 
  nature 
  in 
  England 
  by 
  stray 
  

   individuals 
  which 
  have 
  accidentally 
  escaped 
  from 
  the 
  laboratories. 
  It 
  is, 
  however, 
  

   very 
  surprising 
  that 
  the 
  first 
  recorded 
  specimens 
  to 
  be 
  found 
  under 
  natural 
  conditions 
  

   in 
  England 
  should 
  have 
  occurred 
  in 
  a 
  forest 
  to 
  a 
  large 
  extent 
  removed 
  from 
  human 
  

   habitation, 
  since 
  Stegomyia 
  fasciata 
  abroad 
  is 
  essentially 
  a 
  domestic 
  mosquito. 
  The 
  

   insect 
  may 
  therefore 
  be 
  indigenous. 
  

  

  The 
  larvae 
  were 
  collected, 
  and 
  bred 
  out 
  in 
  the 
  laboratory, 
  under 
  my 
  personal 
  

   supervision, 
  so 
  that 
  I 
  can 
  vouch 
  for 
  the 
  absence 
  of 
  any 
  error 
  in 
  the 
  observation. 
  

  

  * 
  Jouraal 
  of 
  Royal 
  Army 
  Medical 
  Corps, 
  Nov., 
  1919. 
  

  

  