﻿28 
  A. 
  K. 
  MORDVILKO. 
  

  

  22 
  (23). 
  On 
  8th 
  tergite 
  a 
  fairly 
  large 
  central 
  finger-shaped 
  process 
  directed 
  

  

  slantingly 
  backwards 
  and 
  upwards. 
  On 
  Horde 
  um, 
  Triticum 
  and 
  other 
  

   Graminaceae 
  ; 
  South 
  Russia, 
  Transcaucasia, 
  Turkestan 
  

  

  B. 
  noxius, 
  Mordv. 
  

  

  23 
  (22). 
  No 
  process 
  on 
  8th 
  tergite. 
  

  

  24 
  (27). 
  Antennae 
  of 
  apterous 
  viviparous 
  $? 
  two-sevenths 
  to 
  one-third 
  as 
  long 
  as 
  

  

  the 
  body 
  ; 
  spur 
  of 
  6th 
  joint 
  exceeding 
  base 
  of 
  that 
  joint 
  by 
  one-fourth 
  

   to 
  a 
  half 
  ; 
  4th 
  and 
  5th 
  joints 
  and 
  base 
  of 
  6th 
  almost 
  equal 
  to 
  each 
  

   other. 
  

  

  25 
  (26). 
  Antennal 
  tubercles 
  developed 
  ; 
  central 
  frontal 
  process 
  as 
  high 
  as 
  the 
  

  

  antennal 
  tubercles 
  and 
  separated 
  from 
  them 
  by 
  furrows 
  ; 
  body 
  of 
  

   apterous 
  viviparous 
  $$ 
  dark 
  greyish 
  green, 
  dusted 
  with 
  greyish 
  white. 
  

   On 
  Agropyrum 
  repens, 
  Lolium 
  and 
  some 
  other 
  Graminaceae 
  ; 
  N. 
  and 
  

   Middle 
  Europe 
  and 
  Russia 
  . 
  . 
  B 
  korotnewi, 
  Mordv. 
  (1901). 
  

  

  (= 
  B. 
  stellariae, 
  Schout., 
  v. 
  d. 
  Goot). 
  

  

  26 
  (25). 
  No 
  antennal 
  tubercles 
  (?) 
  ; 
  front 
  of 
  head 
  broad 
  and 
  slightly 
  convex 
  ; 
  

  

  body 
  of 
  apterous 
  viviparous 
  $$ 
  pale 
  green 
  to 
  pale 
  yellow, 
  dusted 
  with 
  

   white. 
  On 
  Agropyrum 
  glaucum 
  ; 
  N. 
  America, 
  Colorado 
  

  

  B. 
  tritici, 
  Gillette 
  (1911). 
  

  

  27 
  (24). 
  Antennae 
  in 
  apterous 
  viviparous 
  $$ 
  almost 
  half 
  as 
  long 
  as 
  the 
  body 
  ; 
  

  

  spur 
  of 
  6th 
  joint 
  almost 
  twice 
  as 
  long 
  as 
  the 
  base 
  of 
  that 
  joint 
  ; 
  3rd 
  

   joint 
  almost 
  twice 
  as 
  long 
  as 
  4th 
  ; 
  base 
  of 
  6th 
  joint 
  two-thirds 
  to 
  

   four-sevenths 
  the 
  length 
  of 
  5th 
  joint 
  ; 
  body 
  pale 
  green 
  or 
  yellowish 
  

   green, 
  not 
  pruinose. 
  North 
  Russia 
  ; 
  on 
  leaves 
  of 
  Dactylis 
  glomerata 
  

  

  B. 
  slavae, 
  sp. 
  n. 
  

  

  28 
  (1). 
  Of 
  the 
  marginal 
  tubercles 
  those 
  on 
  prothorax 
  and 
  1st 
  and 
  7th 
  abdominal 
  

  

  segments 
  are 
  the 
  most 
  developed 
  ; 
  front 
  of 
  head 
  broad 
  and 
  slightly 
  

   convex 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  Subtribe 
  Aphidina. 
  

  

  29 
  (52). 
  Antennae 
  in 
  summer 
  apterous 
  viviparous 
  $$, 
  as 
  well 
  as 
  in 
  alatae, 
  6-jointed 
  

  

  (the 
  fundatrices 
  only 
  of 
  some 
  species 
  have 
  5 
  joints). 
  

  

  30 
  (31). 
  Cornicles 
  one-half 
  to 
  two-thirds 
  the 
  length 
  of 
  cauda 
  ; 
  slightly 
  narrowed 
  

  

  towards 
  base 
  ; 
  front 
  of 
  head 
  slightly 
  convex 
  between 
  the 
  low 
  antennal 
  

   tubercles 
  ; 
  body 
  of 
  apterous 
  viviparous 
  $$ 
  elongate 
  ovate 
  or 
  fusiform, 
  

   green, 
  dusted 
  with 
  greyish 
  white 
  . 
  . 
  . 
  . 
  Genus 
  Hyalopterus, 
  Koch. 
  

  

  This 
  contains 
  only 
  H. 
  pruni, 
  F. 
  (= 
  arundinis, 
  F.). 
  The 
  primary 
  

   host-plants 
  are 
  Prunus 
  domestica, 
  P. 
  spinosa, 
  P. 
  insiticia 
  and 
  P. 
  

   armeniaca, 
  on 
  the 
  leaves 
  of 
  which 
  the 
  Aphids 
  can 
  multiply 
  all 
  the 
  

   summer 
  ; 
  the 
  secondary 
  plant 
  is 
  the 
  reed, 
  Phragmites 
  co»imunis. 
  

  

  31 
  (30). 
  Cornicles 
  longer 
  than 
  cauda, 
  seldom 
  ( 
  A. 
  donacis, 
  Pass.) 
  somewhat 
  shorter, 
  

  

  more 
  or 
  less 
  broadened 
  towards 
  the 
  base 
  ; 
  cauda 
  distinct, 
  elongate 
  or 
  

   short-triangular. 
  

  

  32 
  (37). 
  Antennal 
  tubercles 
  distinct 
  and 
  somewhat 
  higher 
  than 
  the 
  central 
  frontal 
  

  

  projection 
  ; 
  antennae 
  longer 
  than 
  half 
  the 
  body 
  ; 
  cauda 
  well 
  developed, 
  

   but 
  shorter 
  than 
  cornicles 
  ; 
  median 
  vein 
  of 
  front 
  wing 
  branching 
  only 
  

   once 
  in 
  alate 
  individuals 
  . 
  . 
  . 
  . 
  . 
  . 
  Genus 
  Toxoptera, 
  Koch. 
  

  

  33 
  (36). 
  Colour 
  pale 
  or 
  light 
  green 
  with 
  deeper 
  green 
  median 
  line, 
  cauda 
  light 
  

  

  green 
  ; 
  in 
  apterous 
  individuals 
  cornicles 
  also 
  green, 
  but 
  dark 
  at 
  apex 
  ; 
  

   first 
  two 
  joints 
  of 
  antennae 
  and 
  base 
  of 
  3rd 
  light 
  green. 
  

  

  34 
  (35). 
  Cornicles 
  of 
  apterous 
  viviparous 
  $$ 
  almost 
  twice 
  as 
  long 
  as 
  cauda; 
  

  

  third 
  joint 
  of 
  antennae 
  two-thirds 
  longer 
  than 
  the 
  4th 
  ; 
  males 
  alate. 
  

   South 
  Europe, 
  Transcaucasia, 
  Turkestan, 
  N. 
  America 
  

  

  T. 
  gratninum, 
  Rond. 
  

  

  