﻿amekican 
  leaf-hoppers 
  of 
  the 
  subfamily 
  

   typhlocybi:n^ae. 
  

  

  By 
  Clarence 
  P. 
  Gillette, 
  

  

  I'ro/tssor 
  of 
  Zoolofiii 
  and 
  Eiilomolofiij, 
  Colorado 
  Jc/ricxUnnd 
  (ollef/e. 
  

  

  This 
  snbfixmily 
  comprises 
  the 
  lowest, 
  and 
  also 
  the 
  most 
  beautiful 
  aud 
  

   fragile, 
  of 
  tbe 
  species 
  included 
  in 
  the 
  family 
  Jassidae 
  of 
  the 
  order 
  

   Hemiptera. 
  On 
  account 
  of 
  the 
  very 
  small 
  size 
  of 
  most 
  of 
  the 
  species 
  

   aud 
  the 
  difficulty 
  with 
  which 
  they 
  are 
  preserved 
  in 
  suitable 
  couditiou 
  

   for 
  study, 
  the 
  group 
  has 
  been 
  much 
  neglected 
  bj" 
  students 
  of 
  entomology 
  

   in 
  this 
  country. 
  Mr. 
  Van 
  Duzee, 
  in 
  his 
  Catalogue 
  of 
  the 
  Described 
  Jas- 
  

   soidea 
  of 
  Xorth 
  America, 
  lists 
  thirty-five 
  species 
  in 
  this 
  subfamily, 
  and 
  

   Berg, 
  in 
  Hemiptera 
  Argentina, 
  described 
  three 
  species 
  from 
  South 
  

   America, 
  while 
  Doctor 
  L. 
  Melichar, 
  in 
  Oicadinen 
  von 
  ^littel-Europa, 
  

   lists 
  seventy-three 
  species. 
  Although 
  the 
  present 
  paper 
  fully 
  doubles 
  

   the 
  number 
  of 
  species 
  known 
  to 
  occur 
  in 
  the 
  Americas, 
  it 
  is 
  evident 
  

   that 
  the 
  study 
  of 
  the 
  Typhlocybiuae 
  on 
  this 
  side 
  of 
  the 
  Atlantic 
  is 
  only 
  

   fairly 
  begun. 
  

  

  The 
  attempt 
  is 
  here 
  made 
  to 
  get 
  together 
  the 
  scattered 
  descriptions 
  

   of 
  American 
  species, 
  to 
  give 
  a 
  fairly 
  complete 
  bibliography 
  of 
  American 
  

   literature 
  on 
  the 
  group, 
  to 
  straighten 
  out 
  the 
  synonymy 
  among 
  the 
  

   species, 
  and 
  to 
  describe 
  such 
  new 
  foruis 
  as 
  have 
  come 
  to 
  hand, 
  so 
  that 
  

   others 
  may 
  be 
  helped 
  in 
  working 
  up 
  such 
  material 
  as 
  they 
  possess. 
  INo 
  

   attempt 
  has 
  been 
  made 
  to 
  give 
  a 
  complete 
  bibliography 
  of 
  other 
  than 
  

   American 
  writings, 
  but 
  in 
  every 
  case 
  all 
  references 
  are 
  given 
  that 
  have 
  

   come 
  to 
  my 
  notice. 
  

  

  Classijicntion. 
  — 
  It 
  will 
  be 
  noticed 
  that 
  certain 
  genera 
  recognized 
  by 
  

   late 
  European 
  writers 
  are 
  not 
  recognized 
  in 
  this 
  paper. 
  JErythria 
  is 
  

   united 
  with 
  Bicraneura, 
  and 
  Zyglna 
  and 
  ZygineUa 
  with 
  Typhlocyha, 
  

   because 
  the 
  characters 
  separating 
  these 
  genera 
  seem 
  to 
  me 
  not 
  to 
  be 
  of 
  

   generic 
  importance. 
  Chloritasbud 
  Kyhosa,ve 
  put 
  under 
  -£J/»j)oasc« 
  because 
  

   Empoasca 
  has 
  precedence 
  and 
  covers 
  both 
  of 
  the 
  former, 
  aud 
  because 
  

   the 
  characters 
  separating 
  the 
  genera 
  are 
  not 
  constant. 
  Among 
  the 
  

   species 
  described 
  in 
  this 
  paper 
  there 
  can 
  be 
  found 
  every 
  xjossible 
  grada- 
  

   tion 
  between 
  the 
  Chlorita 
  and 
  Kyhos 
  type 
  of 
  vertex, 
  and 
  the 
  difference 
  

   in 
  elytral 
  venation 
  is 
  often 
  found 
  in 
  a 
  single 
  species 
  and 
  even 
  in 
  single 
  

   individuals. 
  

  

  Proceedings 
  U. 
  S. 
  National 
  Museum, 
  Vol. 
  XX— 
  No. 
  1138. 
  

  

  709 
  

  

  