﻿18 
  

  

  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  

  

  vol. 
  67 
  

  

  Amphorophora 
  and 
  the 
  Macrosiphum 
  as 
  Passerini 
  and 
  Sanderson 
  

   have 
  pointed 
  out. 
  He 
  described 
  two 
  or 
  more 
  species 
  with 
  both 
  

   swollen 
  and 
  slender 
  cornicles 
  as 
  varieties, 
  calling 
  the 
  species 
  Aphis 
  

   lactucae 
  Linnaeus 
  and 
  cited 
  both 
  Linnaeus 
  and 
  Kaltenbach. 
  

  

  Koch 
  under 
  the 
  name 
  of 
  Rhopalosiphum 
  ribis 
  Linnaeus 
  seems 
  to 
  

   confuse 
  two 
  species 
  on 
  Ribis, 
  describing 
  and 
  figuring 
  one 
  with 
  swollen 
  

   cornicles 
  and 
  also 
  speaking 
  of 
  the 
  pseudogalls 
  of 
  Myzus 
  ribis 
  Linnaeus. 
  

  

  Buckton 
  follows 
  Koch 
  in 
  calling 
  the 
  winter 
  form 
  Rhopalosiphum 
  

   ribis 
  Linnaeus 
  but 
  figures 
  the 
  typical 
  pseudogalls 
  of 
  Myzus 
  ribis 
  

   Linnaeus. 
  He 
  calls 
  the 
  summer 
  form 
  Rhopalosiphum 
  lactucae 
  

   Kaltenbach. 
  

  

  Van 
  der 
  Goot 
  refers 
  the 
  species 
  to 
  Rhopalosiphum 
  ribis 
  Linnaeus. 
  

   Both 
  he 
  and 
  Buckton 
  also 
  have 
  Myzus 
  ribis 
  Linnaeus. 
  

  

  Three 
  names 
  have 
  then 
  been 
  applied 
  to 
  this 
  species 
  — 
  ribis 
  Lin- 
  

   naeus, 
  lactucae 
  Linnaeus, 
  and 
  lactucae 
  Kaltenbach. 
  Aphis 
  ribis 
  

   Linnaeus 
  is 
  accepted 
  to 
  be 
  Myzus 
  ribis 
  Linnaeus. 
  Aphis 
  lactucae 
  

   Linnaeus 
  is 
  a 
  Macrosiphum. 
  Aphis 
  lactucae 
  Kaltenbach 
  is 
  a 
  

   homonym 
  of 
  Aphis 
  lactucae 
  Linnaeus, 
  and 
  can 
  not 
  be 
  used. 
  A 
  new 
  

   name 
  is 
  therefore 
  necessary 
  and 
  the 
  name 
  cosmopolitana 
  is 
  here 
  

   proposed. 
  

  

  This 
  species 
  seems 
  to 
  have 
  very 
  close 
  relatives, 
  both 
  on 
  currant 
  

   and 
  on 
  its 
  summer 
  hosts. 
  On 
  currant 
  I 
  am 
  describing 
  in 
  this 
  paper 
  

   pergandei, 
  new 
  species. 
  On 
  Sonchus 
  there 
  are 
  several 
  forms 
  as 
  

   discussed 
  on 
  page 
  4. 
  

  

  Apterous 
  spring 
  form 
  on 
  Ribes. 
  — 
  Antennae 
  shorter 
  than 
  body, 
  

   light 
  colored, 
  not 
  conspicuously 
  imbricated, 
  hairs 
  inconspicuous, 
  

   much 
  shorter 
  than 
  width 
  of 
  segment, 
  III 
  with 
  1-3 
  small 
  sensoria 
  at 
  

   base. 
  Antennal 
  tubercles 
  of 
  moderate 
  size. 
  Beak 
  reaching 
  between 
  

   second 
  and 
  third 
  coxae. 
  Cornicles 
  short, 
  thick, 
  plainly 
  swollen, 
  the 
  

   tips 
  darker 
  and 
  imbricated. 
  The 
  cauda 
  narrow, 
  strongly 
  constricted 
  

   in 
  some 
  specimens, 
  less 
  so 
  in 
  others, 
  three 
  sets 
  of 
  lateral 
  hairs. 
  

  

  