﻿ART. 
  20 
  

  

  THE 
  APHID 
  GENUS 
  AMPHOROPHORA 
  MASON 
  

  

  43 
  

  

  It 
  is 
  probable 
  that 
  Pergande 
  referred 
  to 
  the 
  intermediate 
  when 
  he 
  

   said 
  "antennae 
  dusky 
  to 
  black" 
  as 
  the 
  second 
  part 
  of 
  his 
  description, 
  

   "pale, 
  the 
  apex 
  of 
  jts. 
  3-5 
  and 
  the 
  6th 
  with 
  spur 
  black," 
  seems 
  to 
  

   apply 
  better 
  to 
  the 
  apterous 
  forms. 
  

  

  Intermediate. 
  — 
  The 
  one 
  specimen 
  available 
  (metatype 
  specimen) 
  

   has 
  antennae 
  which 
  are 
  intermediate 
  in 
  color 
  between 
  the 
  black 
  

   ones 
  of 
  the 
  alates 
  and 
  the 
  lighter 
  ones 
  of 
  the 
  apterous 
  forms. 
  Both 
  

   antennae 
  are 
  abortive, 
  one 
  having 
  only 
  a 
  very 
  short 
  fifth 
  segment 
  and 
  

   no 
  sixth, 
  while 
  the 
  other 
  has 
  the 
  fifth, 
  base 
  of 
  sixth 
  and 
  a 
  very 
  short 
  

   unguis. 
  Ill 
  and 
  IV 
  are 
  thickly 
  covered 
  with 
  rather 
  small 
  sensoria. 
  

   V 
  of 
  the 
  one 
  antenna 
  has 
  six 
  small 
  inconspicuous 
  sensoria. 
  No 
  

   ocelli 
  showing. 
  Wings 
  very 
  small 
  and 
  abortive, 
  about 
  equally 
  

   developed 
  on 
  each 
  side, 
  hooks 
  showing 
  on 
  both 
  hind 
  wings. 
  Corni- 
  

   cles 
  and 
  cauda 
  appearing 
  about 
  as 
  in 
  the 
  alate 
  and 
  apterous 
  forms. 
  

   Measurements 
  as 
  follows: 
  

  

  Oestlund 
  reported 
  this 
  species 
  as 
  "very 
  numerous 
  on 
  the 
  upper 
  

   stalk 
  and 
  flower 
  heads 
  of 
  Nabalus 
  albus." 
  Pergande 
  took 
  them 
  on 
  

   the 
  stem 
  and 
  under 
  side 
  of 
  leaves. 
  Miss 
  Patch 
  says 
  it 
  is 
  not 
  uncom- 
  

   mon 
  in 
  the 
  east. 
  

  

  The 
  only 
  dates 
  recorded 
  are 
  September 
  28, 
  1897, 
  at 
  Zoological 
  

   Park, 
  D. 
  C, 
  and 
  July 
  11, 
  1903, 
  at 
  Minneapolis, 
  Minn., 
  both 
  by 
  

   Pergande. 
  

  

  Host. 
  — 
  Nabalus 
  albus. 
  

  

  Distribution. 
  — 
  Minnesota, 
  District 
  of 
  Columbia, 
  Connecticut. 
  

  

  Metatype. 
  — 
  Deposited 
  in 
  U. 
  S. 
  National 
  Museum. 
  

  

  AMPHOROPHORA 
  NERVATA 
  (Gillette) 
  

  

  Figs. 
  130-138 
  

  

  Rhopalosiphum 
  nervatum 
  Gillette, 
  Canad. 
  Ent., 
  vol. 
  40, 
  1908, 
  p. 
  63.— 
  David- 
  

   son, 
  Journ. 
  Ec. 
  Ent., 
  vol. 
  7, 
  1914, 
  p. 
  134.— 
  Essig, 
  Univ. 
  Cal. 
  Pub. 
  Tech. 
  

   Bull. 
  Agr. 
  Exp. 
  Sta. 
  Ent., 
  vol. 
  1, 
  no. 
  7, 
  1917, 
  p. 
  331.— 
  Swain, 
  Univ. 
  Cal. 
  

   Pub. 
  Tech. 
  Bulls. 
  Agr. 
  Exp. 
  Sta. 
  Ent., 
  vol. 
  3, 
  no. 
  1, 
  1919, 
  p. 
  84.— 
  Patch, 
  

   Maine 
  Agr. 
  Exp. 
  Sta. 
  Bull. 
  282, 
  1919, 
  p. 
  220. 
  

  

  Rhopalosiphum 
  arbuti 
  Davidson, 
  Journ. 
  Econ. 
  Ent., 
  vol. 
  3, 
  1910, 
  p. 
  378. 
  — 
  

   Essig, 
  Univ. 
  Cal. 
  Pub. 
  Tech. 
  Bulls. 
  Agr. 
  Exp. 
  Sta. 
  Ent., 
  vol. 
  1, 
  no. 
  7, 
  

   1917, 
  p.331. 
  

  

  The 
  writer 
  has 
  had 
  the 
  privilege 
  of 
  examining 
  the 
  cotype 
  specimens 
  

   of 
  nervatum 
  Gill, 
  from 
  rose 
  and 
  of 
  arbuti 
  Davisdon 
  from 
  Arbutus 
  and 
  

   considers 
  them 
  to 
  be 
  the 
  same 
  as 
  has 
  already 
  been 
  pointed 
  out 
  by 
  

  

  