﻿AliT. 
  20 
  

  

  THE 
  APHID 
  GENUS 
  AMPHOROPHORA 
  MASON 
  

  

  19 
  

  

  Spring 
  Migrant 
  on 
  Ribes. 
  — 
  Antennae 
  dark 
  colored, 
  somewhat 
  

   longer 
  than 
  body, 
  tuberculate, 
  hairs 
  inconspicuous, 
  shorter 
  than 
  

   width 
  of 
  segment, 
  I 
  gibbous 
  on 
  inner 
  side. 
  Antennal 
  tubercles 
  very 
  

   small. 
  Beak 
  short, 
  not 
  reaching 
  second 
  coxae. 
  Prothoracic 
  tubercles 
  

   showing. 
  Abdominal 
  segments 
  with 
  lateral 
  dark 
  patches. 
  Cornicles 
  

   rather 
  short, 
  moderately 
  swollen, 
  slightly 
  imbricated 
  at 
  tips. 
  Cauda 
  

   long, 
  strongly 
  constricted, 
  with 
  three 
  sets 
  of 
  lateral 
  hairs. 
  

  

  Antennal 
  measurements 
  

  

  Other 
  me 
  astir 
  ements 
  

  

  Mate 
  viviparous 
  female 
  (on 
  Sonchus). 
  — 
  Antennae 
  about 
  one-quarter 
  

   longer 
  than 
  body, 
  dark 
  colored, 
  imbricated, 
  numerous 
  sensoria, 
  hairs 
  

   shorter 
  than 
  width 
  of 
  segment, 
  somewhat 
  capitate. 
  Antennal 
  tuber- 
  

   cles 
  very 
  small. 
  Prothoracic 
  lateral 
  tubercles 
  present, 
  a 
  hair 
  in 
  front 
  

   of 
  each. 
  Abdominal 
  segments 
  with 
  lateral 
  dark 
  spots, 
  each 
  spot 
  

   imbricated 
  and 
  having 
  several 
  hairs 
  and 
  usually 
  a 
  tubercle. 
  The 
  

   spiracle 
  shows 
  either 
  on 
  or 
  near 
  this 
  dark 
  spot. 
  A 
  large 
  dorsal 
  dark 
  

   area 
  above 
  and 
  between 
  base 
  of 
  cornicles. 
  Cornicles 
  short, 
  distinctly 
  

   swollen, 
  the 
  tip 
  with 
  about 
  two 
  imbrications. 
  Cauda 
  long, 
  slender, 
  

   strongly 
  constricted, 
  the 
  lateral 
  edges 
  above 
  constriction 
  showing 
  as 
  

   dark 
  colored. 
  An 
  occasional 
  specimen 
  has 
  the 
  cauda 
  much 
  broader 
  

   and 
  not 
  strongly 
  constricted. 
  Three 
  sets 
  of 
  lateral 
  hairs 
  on 
  cauda. 
  

  

  