﻿ART. 
  20 
  

  

  THE 
  APHID 
  GENUS 
  AMPHOROPHORA 
  MASON 
  

  

  45 
  

  

  Davidson 
  in 
  his 
  description 
  of 
  arbuti 
  says, 
  "Joint 
  III 
  has 
  about 
  20 
  

   small 
  sensoria, 
  joint 
  IV 
  about 
  8 
  smaller 
  ones." 
  I 
  have 
  been 
  unable 
  

   to 
  see 
  any 
  sensoria 
  on 
  IV 
  in 
  the 
  specimens 
  which 
  he 
  furnished 
  me. 
  

  

  Apterous 
  viviparous 
  female. 
  — 
  Small. 
  Antennae 
  nearly 
  twice 
  as 
  

   long 
  as 
  body, 
  light 
  colored, 
  the 
  tips 
  of 
  segments 
  and 
  all 
  of 
  VI 
  darker, 
  

   faintly 
  imbricated, 
  hairs 
  inconspicuous, 
  no 
  secondary 
  sensoria. 
  

   Antennal 
  sensoria 
  prominent. 
  Beak 
  reaching 
  third 
  coxae. 
  Cornicles 
  

   long, 
  slender, 
  slightly 
  but 
  distinctly 
  swollen, 
  imbricated, 
  not 
  reticu- 
  

   lated. 
  Cauda 
  very 
  broad, 
  scarcely 
  constricted, 
  with 
  two 
  sets 
  of 
  

   lateral 
  hairs. 
  

  

  Antennal 
  measurements 
  

  

  Other 
  measurements 
  

  

  