﻿ART. 
  20 
  

  

  THE 
  APHID 
  GENUS 
  AMPHOROPHORA 
  MASON 
  

  

  25 
  

  

  No. 
  9155, 
  described 
  above, 
  was 
  taken 
  on 
  Sonchus 
  asper 
  January 
  

   24, 
  1900, 
  District 
  of 
  Columbia. 
  No. 
  5591, 
  3/2, 
  was 
  taken 
  at 
  Fair- 
  

   bury, 
  111., 
  on 
  Sonchus 
  oleracea 
  on 
  October 
  15, 
  1894, 
  along 
  with 
  alate 
  

   viviparous 
  females. 
  

  

  Apterous 
  oviparous 
  female. 
  — 
  Antennae 
  about 
  the 
  same 
  length 
  as 
  

   the 
  body; 
  on 
  some 
  specimens 
  a 
  little 
  longer 
  than 
  body, 
  light 
  colored, 
  

   faintly 
  imbricated, 
  III 
  with 
  a 
  row 
  of 
  2-9 
  sensoria. 
  Antennal 
  

   tubercles 
  prominent. 
  Beak 
  reaching 
  beyond 
  second 
  coxae. 
  No 
  

   thoracic 
  or 
  abdominal 
  tubercles 
  showing. 
  Hind 
  tibiae 
  with 
  numer- 
  

   ous 
  sensoria, 
  especially 
  on 
  basal 
  three-fourths. 
  Cornicles 
  plainly 
  

   swollen; 
  about 
  two 
  imbrications 
  at 
  tip. 
  Cauda 
  short, 
  plainly 
  con- 
  

   stricted, 
  three 
  sets 
  of 
  lateral 
  hairs. 
  Measurements 
  as 
  follows: 
  

  

  A 
  ntennal 
  measurements 
  

  

  Other 
  measurements 
  

  

  