﻿KEYS 
  FOR 
  THE 
  DETERMINATION 
  OF 
  APHIDS. 
  35 
  

  

  6 
  (13). 
  Body 
  of 
  apterous 
  viviparous 
  £$ 
  yellowish 
  white 
  or 
  pale 
  white, 
  broadly 
  

  

  oval 
  or 
  oval, 
  inflated, 
  its 
  width 
  equal 
  to 
  five-ninths 
  to 
  two-thirds 
  of 
  

   the 
  length 
  ; 
  antennae 
  two-sevenths 
  to 
  one-third 
  the 
  length 
  of 
  body, 
  

   usually 
  6- 
  jointed 
  ; 
  hind 
  legs 
  about 
  one-half 
  to 
  two-thirds 
  the 
  length 
  

   of 
  body 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  Group 
  Paracletini. 
  

  

  7 
  (10). 
  Hairs 
  on 
  body 
  little 
  noticeable, 
  only 
  antennae 
  and 
  legs 
  hairy 
  ; 
  hind 
  legs 
  

  

  about 
  half 
  length 
  of 
  body 
  ; 
  hind 
  tarsus 
  two-ninths 
  to 
  one-quarter 
  

   the 
  length 
  of 
  tibia, 
  but 
  its 
  first 
  joint 
  equal 
  to 
  about 
  one-quarter 
  length 
  

   of 
  2nd 
  .. 
  .. 
  ..' 
  .. 
  .. 
  .. 
  Genus 
  Paracletus, 
  Heyd. 
  

  

  8 
  (9). 
  Eyes 
  in 
  apterous 
  viviparous 
  9$ 
  with 
  numerous 
  facets 
  ; 
  body 
  surface 
  

  

  with 
  minute 
  alveolar 
  sculpture 
  ; 
  hairs 
  short, 
  on 
  3rd 
  joint 
  of 
  antennae 
  

   about 
  one-third 
  to 
  two-fifths 
  the 
  diameter 
  of 
  that 
  joint, 
  and 
  on 
  hind 
  

   tibia 
  only 
  one-third 
  to 
  one-quarter 
  the 
  diameter 
  of 
  tibia 
  ; 
  hind 
  femora 
  

   and 
  tibiae 
  thick, 
  thickness 
  of 
  femur 
  0- 
  14-0- 
  16 
  mm. 
  ; 
  body 
  fairly 
  

   inflated, 
  length 
  3-3-9 
  mm. 
  South 
  Europe, 
  Crimea, 
  Transcaucasia, 
  

   Turkestan 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  P. 
  portshinskyi 
  , 
  sp. 
  n. 
  

  

  9 
  (8). 
  Eyes 
  of 
  apterous 
  viviparous 
  $$ 
  with 
  three 
  facets 
  ; 
  body 
  with 
  fine 
  spinules, 
  

  

  especially 
  on 
  fore 
  part 
  ; 
  hairs 
  fairly 
  long, 
  on 
  3rd 
  joint 
  of 
  antennae 
  

   subequal 
  to 
  diameter 
  of 
  that 
  joint, 
  and 
  on 
  hind 
  tibia 
  one-half 
  to 
  five 
  

   eighths 
  of 
  its 
  diameter 
  ; 
  hind 
  legs 
  more 
  slender, 
  femora 
  only 
  about 
  

   0-10 
  mm. 
  in 
  diameter 
  ; 
  length 
  of 
  body, 
  2-67-3 
  mm. 
  Central 
  Europe, 
  

   Poland 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  P. 
  cimiciformis 
  , 
  Heyd. 
  

  

  10 
  (7). 
  Body 
  and 
  legs 
  hairy, 
  hairs 
  fairly 
  dense. 
  

  

  11 
  (12). 
  Legs 
  relatively 
  short, 
  hind 
  ones 
  differing 
  little 
  from 
  middle 
  ones 
  ; 
  3rd 
  

  

  joint 
  of 
  antennae 
  longer 
  than 
  4th 
  and 
  5th 
  together 
  ; 
  antennae 
  about 
  

   half 
  length 
  of 
  body 
  ; 
  rostrum 
  fairly 
  short, 
  not 
  reaching 
  bej'ond 
  first 
  

   pair 
  of 
  legs 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  Genus 
  Schontedenia, 
  n. 
  

  

  Here 
  belongs 
  so 
  far 
  one 
  species, 
  living 
  on 
  roots 
  of 
  Cyperus. 
  Belgium 
  

  

  S. 
  cyperi, 
  Schout. 
  

  

  12 
  (11). 
  Hind 
  legs 
  longer 
  than 
  middle 
  ones, 
  about 
  two-thirds 
  to 
  five-sevenths 
  

  

  the 
  length 
  of 
  body, 
  not 
  thick, 
  hind 
  tibiae 
  somewhat 
  bent 
  ; 
  hind 
  tarsi 
  

   long, 
  about 
  two-sevenths 
  the 
  length 
  of 
  tibia 
  or 
  somewhat 
  shorter, 
  

   almost 
  1| 
  times 
  as 
  long 
  as 
  the 
  middle 
  ones, 
  and 
  their 
  1st 
  joint 
  equal 
  

   to 
  about 
  one-seventh 
  to 
  one-sixth 
  length 
  of 
  2nd 
  

  

  Genus 
  Hemitrama, 
  n. 
  

  

  Here 
  belongs 
  one 
  species, 
  found 
  in 
  Transcaucasia 
  on 
  roots 
  of 
  

   Setaria 
  and 
  other 
  Graminaceae. 
  Third 
  joint 
  of 
  antennae 
  almost 
  

   equal 
  to 
  the 
  two 
  last 
  together 
  ; 
  skin 
  with 
  small 
  denticles 
  and 
  

   spinules, 
  especially 
  on 
  front 
  of 
  body 
  ; 
  hairs 
  on 
  3rd 
  joint 
  of 
  antennae 
  

   almost 
  as 
  long 
  as 
  half 
  the 
  diameter 
  of 
  this 
  joint 
  ; 
  eyes 
  with 
  three 
  

   facets: 
  length 
  2 
  • 
  70-2 
  ■ 
  75 
  mm 
  H. 
  bykovi, 
  sp. 
  n. 
  

  

  13 
  (6). 
  Body 
  of 
  apterous 
  viviparous 
  $$ 
  lemon-, 
  orange-, 
  or 
  ochre- 
  yellow, 
  or 
  else 
  

  

  white 
  or 
  pale 
  green 
  or 
  greenish 
  ; 
  ovally 
  inflated, 
  with 
  fairly 
  short 
  

   legs 
  ; 
  antennae 
  5-jointed 
  Group 
  Fordini. 
  

  

  Here 
  belongs 
  one 
  genus 
  Forda. 
  Heyd.* 
  

  

  14 
  (15). 
  Third 
  joint 
  of 
  antennae 
  of 
  apterous 
  viviparous 
  ?$ 
  distinctly 
  longer 
  than 
  

  

  4th 
  and 
  5th 
  together 
  ; 
  4th 
  joint 
  almost 
  equal 
  to 
  5th 
  ; 
  antennae 
  in 
  

  

  apterous 
  viviparous 
  $5 
  one-third 
  to 
  three-sevenths 
  the 
  length 
  of 
  body 
  

  

  F. 
  formicaria, 
  Heyd. 
  (= 
  ? 
  Tychea 
  amycli, 
  Koch, 
  

  

  -- 
  ? 
  F. 
  occidcnialis, 
  Hart). 
  

  

  * 
  T. 
  D. 
  A. 
  Cockcrell 
  has 
  described 
  from 
  Colorado 
  (N. 
  America) 
  several 
  species 
  of 
  Forda, 
  found 
  

   in 
  ants' 
  nests 
  (Psyche, 
  x, 
  1903, 
  pp. 
  216-21S), 
  but 
  the 
  descriptions 
  are 
  insufficient 
  to 
  enable 
  the 
  

   species 
  to 
  be 
  included 
  in 
  this 
  key. 
  

  

  (6160) 
  

  

  c2 
  

  

  