﻿76 
  rBOCEEDIXGS 
  OF 
  THE 
  XATIOXAL 
  MUSEUM. 
  

  

  tance; 
  fuicula 
  consisting 
  of 
  a 
  pair 
  of 
  adjacent, 
  obtusely 
  angled, 
  scarcely 
  

   l^rojecting, 
  small 
  lobes; 
  cerci 
  long 
  and 
  slender, 
  fully 
  as 
  long 
  as 
  tlie 
  

   supraanal 
  plate, 
  tapering 
  not 
  rapidly 
  and 
  on 
  the 
  basal 
  half 
  only, 
  tlie 
  

   ai)it'al 
  half 
  slender, 
  a 
  little 
  compressed, 
  slightly 
  arcuate, 
  and 
  feebly 
  

   downcurved 
  apically; 
  subapical 
  tubercle 
  of 
  subgenital 
  plate 
  moderate, 
  

   suberect, 
  as 
  viewed 
  from 
  behind 
  very 
  bluntly 
  conical. 
  

  

  Length 
  of 
  body, 
  male, 
  18 
  mm., 
  female, 
  23 
  mm.; 
  antennae, 
  male, 
  7.25 
  

   mm., 
  female, 
  7.8 
  mm.; 
  tegmina, 
  male, 
  10 
  mm., 
  female, 
  13 
  mm.; 
  hind 
  

   femora, 
  male, 
  9.5 
  mm., 
  female, 
  12 
  mm. 
  

  

  Nine 
  males, 
  6 
  females. 
  Yellowstone, 
  Montana, 
  October 
  9, 
  C. 
  Y. 
  Eiley 
  

   (U.S.N.M.); 
  Sweetwater, 
  Wyoming, 
  Tbomas 
  (U.S.N.M., 
  [Js^o. 
  715]); 
  

   Wyoming, 
  Morrison 
  (U.S.N.M.); 
  Newcastle, 
  Weston 
  County, 
  Wyo- 
  

   ming 
  (L. 
  Bruner); 
  Gordon, 
  Sheridan 
  County, 
  Nebraska, 
  August 
  (L. 
  

   Bruner); 
  Explorations 
  in 
  the 
  Upper 
  Missouri 
  and 
  Yellowstone, 
  F. 
  Y. 
  

   Hay 
  den. 
  

  

  The 
  species 
  was 
  originally 
  reported 
  from 
  "between 
  Eed 
  Buttes 
  and 
  

   Indei)endeiice 
  Bock, 
  Wyoming," 
  but 
  it 
  has 
  since 
  beeu 
  recorded 
  by 
  

   Bruner 
  (doubtless 
  in 
  some 
  cases 
  by 
  mistake 
  for 
  some 
  of 
  the 
  allied 
  spe;- 
  

   cies 
  here 
  first 
  separated) 
  from 
  Garden 
  City, 
  Finney 
  County, 
  Kansas, 
  

   western 
  Nebraska, 
  Arizona, 
  New 
  Mexico, 
  Montana 
  and 
  the 
  Pacific 
  

   Coast. 
  

  

  According 
  to 
  Bruner, 
  this 
  species 
  in 
  the 
  Yellowstone 
  region 
  "only 
  

   feeds 
  upon 
  two 
  species 
  of 
  plants, 
  as 
  nearly 
  as 
  I 
  could 
  ascertain 
  by 
  

   observation, 
  viz., 
  the 
  'pigweed' 
  and 
  a 
  small 
  greenish 
  white 
  plant 
  of 
  a 
  

   similar 
  luiture. 
  Those 
  found 
  on 
  the 
  pigweed 
  are 
  somewhat 
  glaucous 
  

   yellow, 
  while 
  those 
  feeding 
  on 
  the 
  other 
  plant 
  are 
  more 
  of 
  a 
  whitish 
  

   color, 
  mingled 
  with 
  greenish 
  blue 
  instead 
  of 
  greenish 
  yellow," 
  the 
  color 
  

   of 
  the 
  insects 
  resembling 
  to 
  a 
  considerable 
  degree 
  that 
  of 
  the 
  plants- 
  

   on 
  which 
  they 
  feed. 
  

  

  7. 
  AEOLOPLUS 
  PLAGOSUS. 
  

  

  (Plate 
  VI, 
  fig. 
  1.) 
  

  

  Pezoiettix 
  plagosus 
  Scudder!, 
  Auu. 
  Rep. 
  Chief 
  Eug., 
  1876 
  (1877), 
  p. 
  504; 
  Can. 
  

   Eut.,XII 
  (1889), 
  p. 
  75. 
  

  

  Brownish 
  yellow 
  marked 
  with 
  dark 
  brown 
  or 
  brownish 
  fuscous: 
  

   especially 
  noticeable 
  is 
  a 
  dark 
  mediodorsal 
  stripe, 
  extending 
  from 
  tlie 
  

   middle 
  of 
  the 
  vertex 
  between 
  the 
  eyes, 
  where 
  it 
  is 
  not 
  half 
  so 
  broad 
  

   as 
  the 
  interspace, 
  to 
  or 
  nearly 
  to 
  the 
  posterior 
  end 
  of 
  the 
  pronotuiu, 
  

   broadening 
  as 
  it 
  goes, 
  on 
  the 
  posterior 
  half 
  of 
  the 
  pronotum 
  inclosing 
  

   a 
  median 
  pale 
  line 
  and 
  fading 
  out 
  before 
  the 
  end 
  of 
  the 
  metazona; 
  

   there 
  is 
  also 
  a 
  broad 
  dark 
  belt 
  at 
  the 
  upper 
  limit 
  of 
  the 
  lateral 
  lobes 
  on 
  

   the 
  prozona, 
  extending 
  forward 
  to 
  the 
  eyes 
  and 
  fading 
  i 
  nferiorly 
  ; 
  inter- 
  

   space 
  between 
  the 
  eyes 
  slightly 
  broader 
  than 
  the 
  frontal 
  costa, 
  the 
  fas- 
  

   tigium 
  broadly 
  and 
  rather 
  shallowly 
  sulcate, 
  the 
  frontal 
  costa 
  equal, 
  

   narrowly 
  sulcate 
  below 
  the 
  ocellus. 
  Pronotum 
  broadening 
  slightly 
  

   posteriorly, 
  the 
  metazona 
  punctate, 
  the 
  median 
  carina 
  distinct 
  only 
  

  

  