﻿232 
  PROCEEDINdS 
  OF 
  THE 
  XATIOXAL 
  MUSEUM. 
  vouxx. 
  

  

  which 
  generally 
  terminate 
  beyond 
  the 
  middle; 
  the 
  furcula 
  is 
  usually 
  

   developed 
  as 
  slight, 
  tapering 
  denticulations 
  only, 
  and 
  in 
  one 
  case 
  these 
  

   disappear, 
  but 
  sometimes 
  they 
  are 
  longer 
  so 
  as 
  to 
  be 
  nearly 
  or 
  quite 
  a 
  

   fourth 
  as 
  long 
  as 
  the 
  supraanal 
  i)late; 
  the 
  cerci 
  are 
  simple 
  blades 
  of 
  

   moderate 
  breadth, 
  generally 
  a 
  little 
  arcuate, 
  tapering 
  a 
  little 
  in 
  the 
  

   proximal, 
  subequal 
  in 
  the 
  distal 
  half 
  and 
  rounded 
  apically, 
  not 
  reach- 
  

   ing 
  the 
  tip 
  of 
  the 
  supraanal 
  plate; 
  the 
  subgenital 
  plate 
  is 
  small 
  and 
  

   the 
  lateral 
  and 
  apical 
  margins 
  usuall^'^ 
  on 
  the 
  same 
  plane, 
  except 
  for 
  a 
  

   slight 
  apical 
  elevation 
  or 
  angulation 
  which 
  may 
  take 
  the 
  form 
  of 
  a 
  

   tubercle, 
  but 
  in 
  one 
  species 
  this 
  also 
  is 
  wanting. 
  

  

  The 
  species, 
  mostly 
  of 
  medium 
  or 
  small 
  size 
  and 
  seven 
  in 
  number, 
  

   have 
  a 
  tolerably 
  wide 
  range 
  in 
  the 
  western 
  portion 
  of 
  the 
  continent, 
  

   from 
  Washington, 
  South 
  Dakota, 
  and 
  Michigan 
  to 
  southern 
  California, 
  

   Texas, 
  and 
  Mexico; 
  but 
  with 
  a 
  single 
  exception 
  (Montana), 
  the 
  same 
  

   district 
  does 
  not 
  support 
  two 
  species. 
  One 
  species 
  is 
  found 
  about 
  and 
  

   near 
  the 
  upper 
  Mississippi, 
  a 
  second 
  along 
  the 
  eastern 
  border 
  of 
  the 
  

   Eocky 
  Mountains 
  from 
  Montana 
  to 
  New 
  Mexico, 
  a 
  third 
  in 
  Montana, 
  

   a 
  fourth 
  in 
  Washington, 
  and 
  the 
  others 
  resiDectively 
  in 
  southern 
  Cali- 
  

   fornia, 
  Texas, 
  and 
  Mexico. 
  

  

  53. 
  MELANOPLUS 
  MONTANUS. 
  

  

  (Plate 
  XV, 
  fig. 
  8.) 
  

  

  Platiiphyma 
  montana 
  ThOxMAs!, 
  Rep. 
  U. 
  S. 
  Geol. 
  Surv. 
  Terr., 
  V 
  (1873), 
  ]i. 
  155. 
  — 
  

   Glo\ 
  Ei{, 
  111. 
  N. 
  A. 
  Eut., 
  Orth. 
  (1874), 
  pi. 
  xviii, 
  tig. 
  11. 
  — 
  Brunek, 
  Kep. 
  I'. 
  8. 
  

   Ent. 
  Corum., 
  Ill 
  (1883), 
  p. 
  58. 
  

  

  Of 
  medium 
  size, 
  blackish 
  fuscous 
  with 
  a 
  ferruginous 
  tinge. 
  Head 
  not 
  

   prominent, 
  fusco 
  plumbeous, 
  the 
  mouth 
  parts 
  paler, 
  blackish 
  fuscous 
  

   above, 
  with 
  a 
  broad 
  postocular 
  piceousband; 
  vertex 
  somewhat 
  tumid, 
  

   somewhat 
  elevated 
  above 
  the 
  pronotum, 
  the 
  interspace 
  between 
  the 
  

   eyes 
  fully 
  half 
  as 
  broad 
  again 
  (male) 
  or 
  fully 
  twice 
  as 
  broad 
  (female) 
  

   as 
  the 
  first 
  antennal 
  joint; 
  fastigium 
  steeply 
  declivent, 
  deeply 
  (male) 
  

   or 
  rather 
  shallowly 
  (female) 
  sulcate 
  throughout; 
  frontal 
  costa 
  lost 
  before 
  

   the 
  clypeus, 
  subequal, 
  rather 
  narrower 
  than 
  the 
  interspace 
  between 
  the 
  

   eyes, 
  slightly 
  (male) 
  or 
  distinctly 
  (female) 
  sulcate 
  at 
  and 
  for 
  a 
  brief 
  

   distance 
  below 
  the 
  ocellus, 
  rather 
  heavily 
  pun(;tate 
  throughout, 
  the 
  

   larger 
  i)uncta 
  above 
  the 
  ocellus 
  arranged 
  biseriately 
  and 
  laterally; 
  eyes 
  

   not 
  very 
  prominent 
  but 
  a 
  little 
  more 
  so 
  in 
  the 
  male 
  than 
  in 
  the 
  female, 
  

   of 
  moderate 
  size, 
  as 
  long 
  as 
  the 
  infraocular 
  portion 
  of 
  the 
  genae; 
  anten- 
  

   nae 
  nearly 
  as 
  long 
  as 
  the 
  hind 
  femora 
  in 
  the 
  male. 
  Pronotum 
  subequal, 
  

   feebly 
  expanding 
  ])osteriorly 
  in 
  the 
  female, 
  the 
  lower 
  portion 
  of 
  the 
  

   lateral 
  lobes 
  dull 
  dark 
  testaceous 
  in 
  contrast 
  to 
  the 
  piceous 
  band 
  of 
  

   the 
  ui»per 
  half, 
  which 
  is 
  not 
  lost 
  (though 
  obscured) 
  on 
  the 
  metazona,the 
  

   disk 
  rather 
  broadly 
  convex, 
  passing 
  (on 
  the 
  ])rozona 
  insensibly, 
  on 
  

   the 
  metazona 
  with 
  a 
  rounded 
  shoulder) 
  into 
  the 
  subvertical 
  lateral 
  

   lobes; 
  median 
  carina 
  distinct 
  on 
  the 
  metazona, 
  obsolete 
  on 
  the 
  ])rozona; 
  

   front 
  margin 
  truncate, 
  hind 
  margin 
  broadly 
  obtnsangulate, 
  the 
  angle 
  

   well 
  rounded; 
  prozoua 
  feebly 
  longitudinal 
  (male) 
  or 
  transverse 
  (female). 
  

  

  I 
  

  

  