﻿724 
  PROCEEDINGS 
  OF 
  THE 
  XATIONAL 
  MUSEUM. 
  vor..xx 
  

  

  Type.—^o. 
  3418, 
  U.S.N.M. 
  

  

  Described 
  from 
  a 
  single 
  male 
  from 
  the 
  l^. 
  S. 
  Xatioual 
  

   Museum 
  labeled 
  " 
  L. 
  J. 
  Bah, 
  4/1, 
  1879, 
  Schwarz.'' 
  

  

  Genus 
  EMPOASCA 
  Walsh. 
  

  

  40 
  On 
  account 
  of 
  feeble 
  structural 
  characters, 
  a 
  large 
  number 
  

  

  of 
  simihir 
  species 
  and 
  many 
  inadequate 
  

   descriptions, 
  I 
  have 
  found 
  the 
  genus 
  Em- 
  

   poasca 
  a 
  difficult 
  one 
  to 
  work 
  with. 
  Many 
  

   ^^ 
  of 
  the 
  species 
  are 
  extremely 
  abundant 
  

  

  in 
  individuals 
  and 
  are 
  widely 
  spread 
  geo- 
  

   graphically. 
  It 
  is 
  a 
  genus 
  containing 
  

   mauy 
  species 
  in 
  both 
  North 
  and 
  South 
  

   42 
  America. 
  Several 
  species 
  are 
  reduced 
  to 
  

   Figs. 
  40, 
  41, 
  an,! 
  42 
  -Vertex 
  and 
  pro- 
  gynonyms 
  in 
  this 
  paper, 
  and 
  a 
  further 
  

  

  NOTUM, 
  ELYTKOX. 
  AND 
  WING 
  OF 
  DICKA- 
  . 
  ■• 
  it 
  t 
  ., 
  

  

  NEUKA 
  QUADEiviTTATA. 
  study 
  Will 
  probably 
  reduce 
  others. 
  

  

  ANALYTICAL 
  KEY 
  TO 
  THE 
  AMEIUCAN 
  SPECIES 
  OF 
  THE 
  GENUS 
  EMPOASCA. 
  

  

  'A. 
  Vertex 
  not 
  produced, 
  or 
  very 
  slightly 
  so. 
  

   B. 
  Elytra 
  Avitli 
  smoky 
  or 
  l)lack 
  coloration 
  only. 
  

   C. 
  Prevailing 
  color 
  green. 
  

  

  D. 
  Dark 
  dorsal 
  stripe 
  on 
  thorax 
  and 
  elytra 
  smarafjchda. 
  

  

  DD. 
  Elytra 
  with 
  two 
  and 
  pionotum 
  with 
  one 
  transverse 
  dark 
  stripe 
  . 
  . 
  trifasciala. 
  

   C. 
  General 
  color 
  yellow. 
  

  

  D. 
  Unicolorous 
  smoky 
  yellow 
  cliipcata. 
  

  

  DD. 
  Mostly 
  smoky 
  to 
  entirely 
  hlue-black 
  above. 
  

  

  E. 
  Yellow 
  beneath, 
  length 
  about 
  5 
  mm 
  Hvingnioi! 
  ii. 
  

  

  EE. 
  Black 
  beneath, 
  length 
  3 
  mm 
  nujra. 
  

  

  BB. 
  Elytra 
  tinged 
  with 
  smoky 
  and 
  with 
  narrow 
  orange 
  lines, 
  vertex 
  yellow, 
  

  

  length 
  o 
  mm 
  piildiella. 
  

  

  BBB. 
  Elytra 
  without 
  distinct 
  dark 
  coloration. 
  

   C. 
  Sides 
  of 
  last 
  ventral 
  segment 
  of 
  female 
  incised. 
  

  

  D. 
  Length 
  5 
  mm 
  aiirroviriilis. 
  

  

  DD. 
  Length 
  4.25 
  mm 
  smaragdiila. 
  

  

  CC. 
  Last 
  ventral 
  segment 
  of 
  female 
  produced 
  but 
  entire 
  on 
  the 
  posterior 
  and 
  

   lateral 
  margins. 
  

   D. 
  Claval 
  suture 
  of 
  elytra 
  blue, 
  a 
  black 
  spot 
  before 
  the 
  cross- 
  veins, 
  .splendida. 
  

  

  DD. 
  Claval 
  suture 
  of 
  elytra 
  pale, 
  deep 
  yelloAV 
  each 
  side 
  albolinea. 
  

  

  DDD. 
  Unicolorous, 
  no 
  line 
  on 
  claval 
  suture 
  ohtnsa. 
  

  

  CCC. 
  Last 
  ventral 
  segment 
  of 
  the 
  female 
  notched 
  at 
  the 
  tip. 
  

  

  D. 
  A 
  broad 
  U-shaped 
  notch 
  pcrgaudU. 
  

  

  DD. 
  Notch 
  otherwise 
  formed. 
  

  

  E. 
  Length 
  over 
  1 
  mm 
  indsd. 
  

  

  EE. 
  Length 
  under 
  4 
  mm. 
  

  

  F. 
  Notch 
  broad, 
  but 
  shallow, 
  basal 
  margin 
  straight 
  deniiciiht. 
  

  

  FF. 
  Like 
  the 
  preceding, 
  except 
  that 
  the 
  notch 
  has 
  a 
  broad, 
  blunt 
  tooth 
  

   extendijig 
  into 
  it 
  from 
  the 
  base. 
  

  

  G. 
  Tooth 
  very 
  short, 
  vertex 
  slightly 
  produced 
  atrolahes. 
  

  

  GG, 
  Tooth 
  reaching 
  nearly 
  to 
  posterior 
  margin 
  of 
  the 
  notch 
  without 
  

   black 
  spot 
  on 
  elytra 
  luiicolor. 
  

  

  ' 
  The 
  description 
  of 
  Empoasca 
  saUnarum 
  Berg, 
  does 
  not 
  enable 
  me 
  to 
  include 
  this 
  

   species 
  in 
  the 
  table. 
  I 
  have 
  copied 
  the 
  description 
  in 
  full 
  and 
  placed 
  the 
  species 
  last. 
  

  

  