﻿332 
  Mr. 
  F. 
  Enock's 
  life-history 
  of 
  

  

  and 
  on 
  June 
  4th, 
  1888, 
  I 
  placed 
  an 
  impregnated 
  female 
  

   under 
  a 
  separate 
  cylinder 
  of 
  book-muslin, 
  a 
  foot 
  high 
  by 
  

   6 
  in. 
  in 
  diameter, 
  carefully 
  fitted 
  and 
  fixed 
  over 
  a 
  flower- 
  

   pot 
  containing 
  a 
  dozen 
  young 
  plants 
  of 
  barley 
  of 
  four 
  

   days' 
  growth 
  ; 
  in 
  a 
  few 
  moments 
  after 
  being 
  introduced, 
  

   the 
  female 
  settled 
  on 
  one 
  of 
  the 
  plants 
  about 
  2 
  in. 
  high, 
  

   and 
  commenced 
  ovipositing 
  as 
  fast 
  as 
  she 
  could 
  : 
  by 
  first 
  

   placing 
  three 
  eggs 
  side 
  by 
  side, 
  then 
  at 
  a 
  short 
  distance 
  

   three 
  more 
  close 
  together, 
  then 
  six 
  on 
  the 
  outside 
  of 
  the 
  

   sheath 
  of 
  the 
  stem, 
  and, 
  apparently 
  becoming 
  excited, 
  

   she 
  laid 
  clusters 
  of 
  three, 
  four, 
  and 
  six 
  ; 
  seven 
  more 
  on 
  

   the 
  outside, 
  and 
  five 
  at 
  the 
  tip 
  of 
  the 
  leaf: 
  thirty-seven 
  in 
  

   all 
  on 
  this 
  one 
  plant 
  ; 
  she 
  then 
  flew 
  to 
  No. 
  2, 
  laying 
  

  

  16 
  on 
  the 
  inside 
  of 
  the 
  leaf, 
  and 
  10 
  on 
  the 
  stem 
  

  

  No. 
  3. 
  4 
  outside, 
  and 
  11 
  on 
  the 
  inside 
  of 
  leaf 
  . 
  

  

  ,, 
  4. 
  24 
  on 
  the 
  inside 
  of 
  leaf, 
  some 
  in 
  clusters 
  

  

  >} 
  ^' 
  10 
  _ 
  )> 
  ,) 
  )f 
  

  

  „ 
  6. 
  6 
  outside 
  sheath, 
  close 
  together, 
  & 
  12 
  inside 
  

  

  J) 
  ' 
  • 
  -'•'^ 
  »« 
  i< 
  i< 
  -!-■* 
  11 
  

  

  Total 
  

  

  = 
  26 
  

   ^ 
  15 
  

   = 
  24 
  

   = 
  10 
  

  

  = 
  ]8 
  

   = 
  28 
  

  

  158 
  

  

  eggs 
  laid 
  by 
  this 
  one 
  female, 
  which 
  is 
  greatly 
  above 
  the 
  

   number 
  stated 
  by 
  most 
  writers, 
  Herr 
  Wagner 
  included 
  ; 
  

   he 
  gives 
  the 
  number 
  at 
  80 
  and 
  under 
  100.* 
  

  

  On 
  July 
  29th, 
  1888, 
  I 
  isolated 
  another 
  female 
  imme- 
  

   diately 
  after 
  impregnation 
  at 
  2 
  p.m., 
  when 
  she 
  commenced 
  

   to 
  oviposit 
  on 
  the 
  barley 
  plants, 
  continuing 
  to 
  do 
  so 
  until 
  

   7 
  p.m. 
  ; 
  on 
  examination 
  of 
  the 
  leaves, 
  I 
  found 
  she 
  had 
  

   laid 
  23 
  eggs 
  on 
  the 
  outside 
  of 
  12 
  leaves, 
  and 
  106 
  on 
  the 
  

   imide 
  of 
  27 
  leaves 
  ; 
  total, 
  129. 
  The 
  next 
  day 
  the 
  fly 
  

   ax)peared 
  to 
  be 
  laying 
  eggs 
  on 
  the 
  muslin, 
  but 
  I 
  could 
  

   not 
  get 
  my 
  lens 
  near 
  enough 
  to 
  detect 
  them. 
  

  

  Aug. 
  3rd, 
  1888. 
  I 
  put 
  six 
  females 
  under 
  a 
  cjdinder, 
  

   but, 
  as 
  I 
  went 
  to 
  Hertford 
  that 
  day, 
  I 
  had 
  not 
  an 
  oppor- 
  

   tunity 
  of 
  watching 
  them 
  or 
  examining 
  the 
  leaves 
  until 
  

   the 
  following 
  day, 
  when 
  I 
  found 
  38 
  eggs 
  had 
  been 
  laid 
  

   on 
  the 
  outside 
  of 
  10 
  leaves, 
  and 
  228 
  on 
  the 
  inside 
  of 
  

   21 
  leaves, 
  varying 
  in 
  number 
  from 
  1 
  to 
  as 
  man}" 
  as 
  44 
  

   on 
  a 
  single 
  leaf. 
  These 
  females 
  did 
  not 
  appear 
  to 
  have 
  

   completed 
  ovipositing, 
  and 
  for 
  some 
  reason 
  would 
  not 
  

   continue. 
  

  

  ''' 
  ' 
  U. 
  S. 
  A. 
  Third 
  Eeport.' 
  Appendix, 
  p. 
  15. 
  

  

  