﻿274 
  PROCEEDINGS 
  OF 
  THE 
  FOURTH 
  ENTOMOLOGICAL 
  MEETING 
  

  

  hours 
  and 
  then 
  supplied 
  with 
  a 
  small 
  piece 
  of 
  moist 
  blotting 
  paper 
  

   will 
  be 
  found 
  (at 
  least 
  in 
  about 
  50 
  per 
  cent, 
  of 
  cases) 
  to 
  lay 
  eggs 
  readily 
  

   in 
  confinement 
  within 
  two 
  to 
  three 
  days 
  after 
  the 
  introduction 
  of 
  mois- 
  

   ture. 
  After 
  oviposition 
  females 
  do 
  not 
  seem 
  to 
  have 
  suffered 
  very 
  

   much 
  if 
  care 
  is 
  taken 
  in 
  supplying 
  the 
  requisite 
  amount 
  of 
  moisture. 
  

   Excess 
  of 
  moisture 
  causes 
  the 
  fly 
  to 
  stick 
  to 
  the 
  tube. 
  After 
  oviposi- 
  

   tion 
  the 
  female 
  looks 
  quite 
  healthy 
  and 
  if 
  allowed 
  to 
  bite 
  will 
  do 
  so 
  

   readily, 
  so 
  much 
  so, 
  that 
  in 
  certain 
  cases 
  they 
  have 
  been 
  observed 
  to 
  

   bite 
  twice 
  within 
  an 
  hour. 
  Eggs 
  can 
  be 
  hatched 
  quite 
  easily 
  in 
  the 
  tube 
  

   they 
  are 
  laid 
  in 
  provided 
  it 
  is 
  kept 
  wet. 
  The 
  eggs 
  are 
  capable 
  of 
  tolera- 
  

   ting 
  any 
  amount 
  of 
  moisture, 
  even 
  submergence, 
  but 
  they 
  are 
  unable 
  

   to 
  survive 
  in 
  the 
  absence 
  of 
  moisture. 
  Eggs 
  of 
  oxystoma 
  and 
  other 
  

   species 
  including 
  C. 
  kiefferi* 
  are 
  elongate, 
  cylindrical, 
  and 
  sometimes 
  

   a 
  little 
  curved. 
  The 
  amount 
  of 
  curvature 
  varies 
  and 
  at 
  times 
  examples 
  

   of 
  straight 
  ones 
  are 
  also 
  met 
  with. 
  Each 
  egg 
  very 
  slightly 
  tapers 
  towards 
  

   both 
  the 
  ends. 
  The 
  anterior 
  end 
  is 
  marked 
  with 
  micropylar 
  cap. 
  When 
  

   freshly 
  laid 
  the 
  egg 
  is 
  white 
  in 
  colour, 
  but 
  it 
  soon 
  begins 
  to 
  change 
  to 
  

   dark 
  brown. 
  The 
  chorion 
  is 
  smooth 
  and 
  exhibits 
  no 
  sign 
  of 
  sculpturing. 
  

   The 
  egg 
  of 
  C. 
  oxif 
  stoma 
  is 
  characteristic 
  in 
  appearance, 
  being 
  surrounded 
  

   by 
  a 
  fringe 
  of 
  very 
  minute 
  curled 
  scale-like 
  spines, 
  the 
  function 
  of 
  which 
  

   is 
  not 
  yet 
  understood 
  but 
  perhaps 
  it 
  may 
  be 
  of 
  the 
  nature 
  of 
  floats 
  as 
  

   in 
  Anopheline 
  eggs. 
  In 
  confinement 
  eggs 
  are 
  generally 
  laid 
  in 
  several 
  

   batches, 
  each 
  batch 
  consisting 
  of 
  7 
  to 
  10 
  eggs 
  which 
  are 
  arranged 
  regularly 
  

   in 
  a 
  line. 
  The 
  number 
  of 
  eggs 
  laid 
  by 
  a 
  single 
  female 
  varies 
  according 
  

   to 
  the 
  physique 
  of 
  the 
  mother 
  fly 
  but 
  a 
  maximum 
  number 
  of 
  156 
  has" 
  

   been 
  counted. 
  A 
  single 
  egg 
  measures 
  | 
  mm. 
  in 
  length 
  and 
  one-twelfth 
  

   mm. 
  in 
  breadth. 
  The 
  incubation 
  period 
  is 
  governed 
  by 
  the 
  tempera- 
  

   ture. 
  LarvjB 
  were 
  obtained 
  in 
  the 
  month 
  of 
  May 
  in 
  about 
  three 
  to 
  

   four 
  days 
  from 
  the 
  date 
  of 
  deposition, 
  while 
  in 
  November 
  seven 
  days 
  

   were 
  necessary 
  for 
  the 
  eggs 
  to 
  hatch. 
  The 
  longest 
  period 
  recorded 
  

   was 
  eleven 
  days 
  between 
  December 
  and 
  January 
  1918. 
  

  

  The 
  young 
  larva 
  comes 
  out 
  of 
  the 
  egg 
  through 
  a 
  longitudinal 
  aperture 
  

   from 
  the 
  micropylar 
  end 
  ; 
  after 
  hatching 
  the 
  chorion 
  does 
  not 
  collapse. 
  

  

  The 
  larva 
  when 
  empty 
  of 
  food 
  is 
  similar 
  in 
  its 
  general 
  appearance 
  

   to 
  a 
  snake. 
  It 
  is 
  3| 
  to 
  4 
  mm. 
  or 
  even 
  a 
  little 
  more 
  in 
  length 
  when 
  adult, 
  

   ochre 
  white, 
  translucent, 
  smooth, 
  with 
  yellowish-brown 
  head. 
  The 
  

   head, 
  which 
  is 
  chitinous 
  from 
  the 
  beginning, 
  is 
  provided 
  with 
  a 
  number 
  

   of 
  small 
  bristles. 
  The 
  body 
  consists 
  of 
  12 
  segments 
  which 
  are 
  almost 
  

   devoid 
  of 
  bristles 
  or 
  hairs 
  when 
  the 
  larva 
  is 
  young, 
  but 
  the 
  adult 
  larva 
  

   develops 
  a 
  series 
  of 
  small 
  hairs 
  on 
  its 
  lateral 
  margins 
  which 
  are 
  arranged 
  

  

  * 
  This 
  species 
  is 
  now 
  known 
  as 
  C. 
  pattoni, 
  Kieffer, 
  {Bull. 
  Soc. 
  Ent. 
  France 
  1921, 
  

   p. 
  7) 
  — 
  Editor. 
  

  

  