﻿KEYS 
  FOR 
  THE 
  DETERMINATION 
  OF 
  APHIDS. 
  

  

  33 
  

  

  23 
  (26). 
  Anal 
  sternite 
  fairly 
  deeply 
  emarginate 
  behind 
  in 
  the 
  middle; 
  on 
  dorsal 
  

  

  surface 
  of 
  body 
  rows 
  of 
  grouped 
  glandular 
  pores, 
  secreting 
  a 
  delicate 
  

   waxy 
  down 
  (in 
  spirit 
  specimens, 
  groups 
  of 
  light 
  pores 
  visible) 
  ; 
  skin 
  

   of 
  body 
  and 
  antennae 
  more 
  or 
  less 
  smooth, 
  not 
  covered 
  with 
  spinules 
  ; 
  

   on 
  3rd 
  joint 
  of 
  antennae 
  small 
  hairs 
  ; 
  hairs 
  on 
  the 
  hind 
  part 
  of 
  body 
  

   delicate, 
  bent 
  A. 
  car 
  ids, 
  Movdv. 
  

  

  24 
  (25). 
  Antennae 
  of 
  apterous 
  viviparous 
  $2 
  five-sevenths 
  the 
  length 
  of 
  body; 
  

  

  spur 
  of 
  6th 
  joint 
  equal 
  to 
  two-thirds 
  of 
  length 
  of 
  basal 
  portion 
  of 
  that 
  

   joint. 
  At 
  Belovej 
  and 
  Petrograd 
  on 
  Car 
  ex 
  sp., 
  and 
  in 
  Jaroslav 
  

   province 
  on 
  ] 
  uncus 
  sp 
  A. 
  caricis 
  caricis, 
  Mordv. 
  

  

  25 
  (24). 
  Antennae 
  of 
  apterous 
  viviparous 
  $2 
  about 
  half 
  the 
  length 
  of 
  body, 
  even 
  

  

  in 
  the 
  alatae 
  slightly 
  less 
  than 
  three-quarters 
  the 
  length 
  of 
  body 
  ; 
  

   spur 
  of 
  6th 
  joint 
  only 
  slightly 
  shorter 
  than 
  base 
  of 
  same 
  joint, 
  equal 
  

   to 
  six-sevenths 
  to 
  nine-tenths 
  of 
  its 
  length. 
  On 
  the 
  island 
  Langr 
  at 
  

   mouth 
  of 
  Amur 
  River 
  . 
  . 
  A. 
  caricis 
  amurensis, 
  subsp. 
  n. 
  (= 
  

  

  Brachycolasballi, 
  GiYLette, 
  1908; 
  on 
  Carex 
  sp., 
  N.America, 
  Colorado). 
  

  

  26 
  (23). 
  Anal 
  sterniteonly 
  faintly 
  emarginate 
  behindin 
  the 
  middle; 
  no 
  pale 
  glandular 
  

  

  pores 
  on 
  dorsal 
  surface 
  of 
  body 
  ; 
  skin 
  with 
  spinules 
  like 
  shagreen 
  ; 
  

   small 
  spinules 
  on 
  joints 
  of 
  antennae 
  arranged 
  in 
  dense 
  transverse 
  

   rows 
  ; 
  hairs 
  on 
  the 
  hind 
  part 
  of 
  body 
  bristly 
  ; 
  no 
  hairs 
  visible 
  on 
  3rd 
  

   joint 
  'of 
  antennae 
  A. 
  caricicola, 
  Mordv., 
  1908. 
  

  

  27 
  (28). 
  Antennae 
  about 
  half 
  the 
  length 
  of 
  body 
  ; 
  spur 
  of 
  last 
  joint 
  almost 
  one- 
  

  

  third 
  of 
  the 
  3rd. 
  On 
  sedges 
  ; 
  Europe 
  • 
  • 
  

  

  A. 
  caricicola 
  caricicola, 
  Mordv. 
  

  

  28 
  (27). 
  Antennae 
  about 
  one-third 
  the 
  length 
  of 
  body 
  ; 
  spur 
  of 
  last 
  joint 
  about 
  

  

  half 
  the 
  3rd 
  joint. 
  On 
  Carex 
  nebraskensis 
  ; 
  N. 
  America, 
  Colorado 
  . 
  . 
  

  

  A. 
  caricicola 
  verrucosa, 
  Gillette, 
  1917. 
  

  

  29 
  (22). 
  Dorsal 
  surface 
  of 
  body 
  of 
  apterous 
  individuals 
  covered 
  with 
  four 
  rows 
  

  

  of 
  tubercles 
  bearing 
  hairs 
  : 
  spur 
  of 
  last 
  joint 
  of 
  antennae 
  not 
  shorter 
  

  

  than 
  base 
  Genus 
  Myzocallis, 
  Pass. 
  

  

  Body 
  of 
  apterous 
  viviparous 
  22 
  green, 
  tubercles 
  on 
  body 
  black 
  ; 
  antennae 
  

   two-thirds 
  the 
  length 
  of 
  body, 
  last 
  two 
  joints 
  black 
  ; 
  base 
  of 
  femora, 
  

   tibiae 
  and 
  tarsi 
  black. 
  Under 
  leaves 
  of 
  Cyperus 
  rotundus; 
  South 
  

   j 
  t£ 
  j 
  y 
  M. 
  cyperus, 
  Macchiati. 
  

  

  30 
  (21). 
  Antennae 
  longer 
  than 
  body, 
  or 
  at 
  least 
  of 
  the 
  same 
  length. 
  

  

  31 
  (32). 
  Head 
  elongato-rectangular 
  ; 
  front 
  of 
  head 
  between 
  base 
  of 
  antennae 
  

  

  almost 
  straight 
  ; 
  eyes 
  remote 
  from 
  base 
  of 
  antennae 
  ; 
  hairs 
  on 
  body 
  

   spatulate 
  or 
  tan-shaped 
  at 
  tip 
  . 
  . 
  . 
  • 
  Genus 
  Saltusaphis, 
  Theo. 
  

  

  * 
  (b) 
  Body 
  elongate, 
  yellowish 
  ; 
  on 
  the 
  head 
  a 
  dark 
  median 
  line 
  and 
  tw 
  

   lateral 
  ones 
  from 
  base 
  of 
  antennae 
  to 
  eyes 
  ; 
  antennae 
  in 
  apterou. 
  

   individuals 
  blackened 
  from 
  the 
  middle 
  of 
  the 
  3rd 
  joint 
  to 
  the 
  end 
  ; 
  

   cornicles 
  dark. 
  On 
  Scirpus 
  ; 
  Egypt, 
  Gezireh 
  . 
  . 
  5. 
  scirpus, 
  Theo. 
  

  

  b 
  (a). 
  On 
  Carex 
  sp. 
  ; 
  N. 
  America, 
  Colorado 
  . 
  . 
  . 
  . 
  . 
  . 
  • 
  • 
  • 
  • 
  • 
  • 
  

  

  Ki 
  S.flabella, 
  Sanb., 
  Gillette 
  (1909, 
  1917). 
  

  

  32 
  (31) 
  Head 
  of 
  the 
  usual 
  form, 
  scarcely 
  longer 
  than 
  broad, 
  or 
  even 
  shorter 
  ; 
  

  

  eyes 
  not 
  far 
  from 
  base 
  of 
  antennae 
  ; 
  antennae 
  longer 
  than 
  body 
  

  

  Genus 
  Callipterus, 
  Koch. 
  

  

  Antennae 
  If 
  times 
  as 
  long 
  as 
  the 
  body 
  ; 
  3rd 
  joint- 
  lf-2 
  times 
  as 
  long 
  as 
  

   4th 
  • 
  4th 
  slightly 
  shorter 
  than 
  5th 
  ; 
  base 
  and 
  spur 
  of 
  6th 
  joint 
  almost 
  

   equal 
  to 
  each 
  other 
  ; 
  cauda 
  wart-shaped 
  ; 
  apterous 
  individuals 
  lemon- 
  

   yellow 
  to 
  dark 
  yellow. 
  N. 
  America, 
  California 
  ; 
  on 
  lower 
  surface 
  of 
  

   leaves 
  of 
  bamboo 
  (Arundo 
  sp.) 
  .. 
  .. 
  C 
  arundicolens, 
  Clarke. 
  

  

  (6160) 
  

  

  