﻿art. 
  20 
  THE 
  APHID 
  GENUS 
  AMPHOROPHORA 
  MASON 
  3 
  

  

  being 
  very 
  prominently 
  swollen, 
  others 
  being 
  very 
  slender, 
  but 
  at 
  

   the 
  same 
  time, 
  plainly 
  dilated. 
  There 
  is 
  a 
  distinet 
  distal 
  flange 
  in 
  

   all 
  species. 
  One 
  group 
  of 
  species 
  has 
  the 
  tip 
  of 
  the 
  cornicles 
  very 
  

   conspicuously 
  reticulated. 
  Another 
  group 
  has 
  no 
  reticulations, 
  but 
  

   often 
  two 
  or 
  more 
  lines 
  or 
  imbrications. 
  Certain 
  species 
  are 
  inter- 
  

   mediate 
  between 
  the 
  reticulated 
  and 
  imbricated 
  ones. 
  Some 
  have 
  

   small 
  scales 
  or 
  imbrications 
  over 
  most 
  of 
  the 
  length 
  of 
  the 
  cornicle, 
  

   while 
  in 
  others 
  these 
  organs 
  have 
  an 
  almost 
  smooth 
  surface. 
  

  

  The 
  shape 
  of 
  the 
  cauda 
  varies 
  from 
  those 
  that 
  are 
  strongly 
  con- 
  

   stricted 
  to 
  those 
  that 
  are 
  conical. 
  The 
  number 
  of 
  hairs 
  on 
  the 
  cauda 
  

   differs 
  in 
  the 
  different 
  species, 
  but, 
  as 
  a 
  rule, 
  there 
  are 
  2 
  to 
  4 
  sets 
  of 
  

   lateral 
  ones. 
  

  

  Tubercles 
  are 
  not 
  conspicuous 
  in 
  the 
  genus 
  as 
  a 
  whole, 
  but 
  several 
  

   species 
  show 
  prothoracic, 
  lateral 
  ones. 
  A 
  few 
  species 
  have 
  them 
  on 
  

   the 
  lateral 
  margins 
  of 
  the 
  abdominal 
  segments. 
  One 
  species 
  has 
  two 
  

   dorsal 
  ones 
  on 
  the 
  head 
  and 
  two 
  on 
  the 
  dorsum 
  of 
  the 
  prothorax. 
  

  

  Intermediates 
  between 
  the 
  alate 
  and 
  apterous 
  forms 
  appear 
  to 
  be 
  

   fairly 
  common 
  in 
  the 
  genus 
  as 
  I 
  have 
  seen 
  them 
  in 
  three 
  species, 
  

   nabali 
  Oestlund, 
  sensoriata 
  Mason, 
  and 
  essigwanai, 
  new 
  name. 
  

  

  The 
  type 
  of 
  the 
  genus 
  is 
  Amphorophora 
  ampullata 
  Buckton, 
  which 
  

   is 
  described 
  in 
  British 
  Aphides. 
  3 
  It 
  was 
  taken 
  on 
  the 
  fronds 
  of 
  

   Cystopteris 
  montana. 
  The 
  type 
  slide 
  still 
  exists 
  in 
  the 
  British 
  Museum 
  

   and 
  contains 
  three 
  apterous 
  viviparous 
  females. 
  A 
  very 
  similar 
  

   species 
  was 
  taken 
  from 
  ferns 
  on 
  the 
  American 
  continent, 
  and 
  drawings 
  

   of 
  it 
  were 
  sent 
  to 
  Frederick 
  Laing 
  for 
  comparison. 
  He 
  says 
  in 
  private 
  

   correspondence 
  that 
  in 
  all 
  of 
  the 
  type 
  specimens 
  of 
  ampullata 
  "the 
  

   sensoria 
  reach 
  nearly 
  the 
  length 
  of 
  Segment 
  III 
  and 
  number 
  from 
  

   30-34." 
  The 
  species 
  from 
  this 
  continent, 
  he 
  says, 
  seems 
  to 
  be 
  the 
  same 
  

   as 
  one 
  which 
  he 
  reared 
  in 
  England 
  from 
  a 
  fern 
  and 
  the 
  same 
  as 
  Van 
  

   der 
  Goot 
  described 
  as 
  ampullata 
  Buckton. 
  4 
  I 
  learn 
  from 
  correspond- 
  

   ence 
  with 
  Professor 
  Oestlund 
  that 
  his 
  1887 
  description 
  of 
  ampullata 
  

   Buckton 
  is 
  of 
  the 
  same 
  species. 
  William's 
  ampullata 
  Buckton? 
  

   (1910) 
  is 
  very 
  probably 
  the 
  same, 
  but 
  I 
  can 
  not 
  tell 
  from 
  his 
  descrip- 
  

   tion, 
  and 
  his 
  specimens 
  seem 
  to 
  be 
  lost. 
  There 
  is 
  also 
  in 
  the 
  National 
  

   Collection 
  the 
  same 
  form 
  from 
  Takahashi. 
  It 
  is 
  probable 
  that 
  all 
  

   references 
  in 
  literature 
  to 
  ampullata 
  Buckton, 
  except 
  those 
  cataloguing 
  

   the 
  original 
  description, 
  refer 
  to 
  this 
  new 
  form. 
  Laing 
  writes 
  that 
  

   he 
  had 
  given 
  to 
  this 
  new 
  form 
  a 
  provisional 
  varietal 
  name, 
  but 
  sug- 
  

   gests 
  that 
  the 
  writer 
  fix 
  the 
  status 
  as 
  he 
  thinks 
  best. 
  In 
  view 
  of 
  the 
  

   differences 
  in 
  the 
  number 
  and 
  position 
  of 
  the 
  sensoria 
  on 
  Segment 
  III 
  

   of 
  the 
  apterous 
  viviparous 
  female, 
  it 
  is 
  my 
  opinion 
  that 
  it 
  is 
  entitled 
  

   to 
  standing 
  as 
  a 
  distinct 
  species, 
  and 
  it 
  is 
  described 
  in 
  this 
  paper 
  as 
  

   A. 
  laingi, 
  new 
  species. 
  A. 
  ampullata 
  Buckton, 
  therefore, 
  at 
  present 
  is 
  

   known 
  only 
  from 
  the 
  type 
  slide. 
  

  

  3 
  Vol 
  1, 
  p. 
  187. 
  

  

  <Beit. 
  Z. 
  Kennt. 
  der 
  Holland, 
  Blattlause 
  (191:0. 
  

  

  