﻿710 
  rROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  Important 
  characters. 
  — 
  The 
  characters 
  in 
  the 
  Typhlocybiiiae 
  are 
  fewer 
  

   and 
  less 
  constant 
  than 
  those 
  of 
  higher 
  forms. 
  The 
  most 
  constant 
  seem 
  

   to 
  be 
  those 
  of 
  the 
  form 
  of 
  tlie 
  face 
  and 
  vertex 
  and 
  genital 
  pieces, 
  and 
  of 
  

   the 
  form 
  and 
  venation 
  of 
  the 
  wings 
  and 
  elytra, 
  

  

  Ackuoivledgments. 
  — 
  Althongh 
  I 
  shall 
  mention, 
  in 
  connection 
  with 
  

   each 
  species, 
  the 
  names 
  of 
  those 
  who 
  have 
  sent 
  me 
  specimens, 
  1 
  feel 
  

   that 
  special 
  mention 
  should 
  be 
  made 
  of 
  the 
  large 
  number 
  of 
  specimens 
  

   sent 
  me 
  for 
  study 
  by 
  the 
  United 
  States 
  National 
  Museum, 
  by 
  the 
  Illinois 
  

   State 
  Laboratory 
  of 
  Natural 
  History, 
  and 
  by 
  Cornell 
  University. 
  Special 
  

   acknowledgments 
  are 
  also 
  due 
  Mr, 
  E. 
  P. 
  Van 
  Duzee, 
  who 
  has 
  sent 
  me 
  

   much 
  American 
  material 
  and 
  who 
  kindly 
  loaned 
  me 
  his 
  private 
  collec- 
  

   ti(ni 
  of 
  European 
  species. 
  

  

  CllAKACTEES 
  DISTIXGl^I8HING 
  THE 
  TYPKLOCYBIXAE. 
  

  

  The 
  Typhlocybinae 
  are 
  readily 
  separated 
  from 
  all 
  other 
  Jassoidea 
  by 
  

   the 
  four 
  longitudinal 
  veins 
  or 
  sectors 
  of 
  the 
  elytra, 
  which 
  run 
  to 
  the 
  

   cross-nervures 
  forming 
  the 
  apical 
  cells 
  without 
  branching, 
  so 
  that 
  there 
  

   are 
  no 
  anteapical 
  cells, 
  and 
  by 
  the 
  lack 
  of 
  supernumerary 
  cells 
  in 
  the 
  

   posterior 
  wings. 
  

  

  AXAl.VTICAL 
  KEY 
  TO 
  TilK 
  AMKUICA.N 
  GEXERA 
  OF 
  TYPULOCYHIXAK. 
  

  

  A. 
  Sectors 
  of 
  posterior 
  wings 
  eudiuy 
  in 
  a 
  imirgiual 
  vein. 
  

  

  B. 
  Elytra 
  with 
  an 
  appendix, 
  beyond 
  the 
  clavus 
  Alebra. 
  

  

  BB. 
  Elytra 
  without 
  appendix. 
  

  

  C. 
  Two 
  apical 
  cells 
  in 
  posterior 
  wing 
  Dicraneura. 
  

  

  CC. 
  One 
  apical 
  cell 
  in 
  posterior 
  wing 
  Empoasca. 
  

  

  AA. 
  Sectors 
  of 
  posterior 
  wings 
  ending 
  in 
  wing 
  margin, 
  no 
  marginal 
  vein. 
  

  

  Sectors 
  1 
  and 
  2 
  uniting 
  so 
  that 
  onl 
  j' 
  three 
  veins 
  extend 
  to 
  the 
  margin 
  . 
  . 
  Ti/2)h 
  loci/ha. 
  

   All 
  four 
  sectors 
  extending 
  to 
  the 
  wing 
  margin 
  Eupttryx. 
  

  

  Genus 
  ALEBRA 
  Fieber. 
  

  

  AXAF-YTICAI. 
  KEY' 
  TO 
  THE 
  AMEltlCAN 
  SPECIES 
  OF 
  THE 
  OEXUS 
  ALEBKA. 
  

  

  A. 
  Vertex 
  broadly 
  rounded, 
  hardly 
  at 
  all 
  produced. 
  

  

  B. 
  Entirely 
  yellow, 
  or 
  whitish 
  and 
  yellow 
  nlhostrieUa. 
  

  

  BB. 
  Yellow, 
  with 
  a 
  broad 
  dorsal 
  stripe 
  blackish. 
  

  

  C. 
  Face 
  broader 
  than 
  long 
  dorsaHs. 
  

  

  CC. 
  Face 
  longer 
  than 
  broad 
  fiiiitidn. 
  

  

  BBB. 
  Elytra 
  deep 
  smoky, 
  marked 
  with 
  red 
  rohnstd. 
  

  

  AA. 
  Vertex 
  much 
  produced. 
  

  

  B. 
  Color 
  light 
  yellow; 
  three 
  dark 
  s])ots 
  on 
  inner 
  margins 
  of 
  elytra 
  trimarulatd. 
  

  

  BB. 
  Color 
  yellow, 
  two 
  broad 
  transverse 
  black 
  bands 
  on 
  elytra 
  bifasciald. 
  

  

  BBB. 
  Light 
  yellow, 
  marked 
  above 
  with 
  white 
  and 
  golden 
  yellow, 
  the 
  

  

  latter 
  margined 
  with 
  black 
  on 
  elytra 
  vurrilhwa. 
  

  

  ALEBRA 
  CURVILINEA. 
  new 
  species. 
  

  

  General 
  color 
  pale 
  yellow, 
  marked 
  above 
  with 
  white'and 
  golden, 
  the 
  

   latter, 
  upon 
  the 
  elytra, 
  margined 
  with 
  black. 
  Length, 
  3 
  mm. 
  

  

  Face 
  very 
  long 
  and 
  narrow, 
  one-third 
  longer 
  than 
  broad; 
  clypeus 
  

  

  