﻿122 
  PROCEEDIXOS 
  OF 
  THE 
  XATIONAL 
  MUSEUM. 
  vol.sx 
  

  

  area 
  intercalata 
  always, 
  even 
  in 
  macropterous 
  forms 
  of 
  dimorphic 
  spe- 
  

   cies, 
  extending 
  somewhat, 
  generally 
  C(nisiderably, 
  beyond 
  tlie 
  middle 
  

   of 
  the 
  tegmiiia. 
  Iliiid 
  femora 
  moderately 
  long 
  and 
  slender, 
  the 
  infe- 
  

   rior 
  genicular 
  lobe 
  with 
  at 
  least 
  a 
  darker 
  basal 
  spot 
  or 
  transverse 
  

   band, 
  the 
  hind 
  tibiae 
  with 
  a 
  variable 
  number 
  of 
  spines 
  (generallj^'nine 
  

   to 
  fourteen) 
  in 
  the 
  outer 
  series, 
  by 
  rare 
  exception 
  eight 
  only. 
  Abdo- 
  

   men 
  more 
  or 
  less 
  compressed, 
  the 
  sides 
  of 
  the 
  first 
  segment 
  with 
  a 
  dis- 
  

   tinct 
  tympanum, 
  the 
  extremity 
  in 
  the. 
  male 
  more 
  or 
  less 
  sometimes 
  

   strongly 
  chivate, 
  usually 
  considerably 
  recurved, 
  the 
  subgenital 
  plate 
  of 
  

   variable 
  form, 
  but 
  always 
  with 
  the 
  lateral 
  margins 
  ampliate 
  at 
  the 
  

   base 
  and 
  with 
  no 
  distinct 
  ai)i('al 
  tubercle, 
  though 
  not 
  infrequently 
  api- 
  

   cally 
  produced 
  or 
  snbtuberculate 
  and 
  frecjuently 
  tumescent: 
  cerci 
  

   exceedingly 
  variable 
  in 
  form, 
  often 
  enlarging 
  apically, 
  always 
  lamellate 
  

   excepting 
  (the 
  lakinus 
  series 
  — 
  three 
  species) 
  where 
  they 
  are 
  basally 
  

   globose, 
  never 
  styliform, 
  rarely 
  (the 
  puer 
  series 
  — 
  two 
  species) 
  in 
  the 
  

   least 
  substyliform, 
  generally 
  incurved 
  and 
  of 
  about 
  the 
  length 
  of 
  the 
  

   supraanal 
  plate; 
  furcula 
  usually 
  developed 
  and 
  to 
  a 
  very 
  variable 
  

   extent, 
  and 
  with 
  variable 
  form; 
  pallium 
  rarely 
  exserted; 
  ovipositor 
  of 
  

   female 
  generally 
  fully 
  exserted. 
  

  

  The 
  type 
  of 
  the 
  genus 
  is 
  Acrid 
  i 
  urn 
  femiir-rtibrum 
  De 
  Geer. 
  

  

  The 
  number 
  of 
  species 
  of 
  Melanoplus 
  is 
  so 
  exceedingly 
  great 
  that 
  I 
  

   have 
  endeavored 
  to 
  display 
  their 
  relationships 
  in 
  part 
  by 
  sei>arating 
  

   them 
  into 
  groups. 
  ISToticing 
  how 
  seldom 
  the 
  characteristic 
  parts 
  of 
  the 
  

   male 
  abdomen 
  agreed 
  in 
  the 
  short-winged 
  and 
  long-winged 
  forms, 
  not- 
  

   withstanding 
  that 
  one 
  would 
  look 
  for 
  their 
  close 
  agreement, 
  I 
  have 
  first 
  

   divided 
  them 
  in 
  the 
  following 
  table 
  into 
  those 
  wliich 
  are 
  fully 
  equipped 
  

   with 
  ample 
  organs 
  of 
  fiight 
  and 
  those 
  in 
  which 
  these 
  organs 
  are 
  more 
  

   or 
  less 
  undeveloped, 
  and 
  then 
  have 
  subdivided 
  each 
  according 
  to 
  other 
  

   characteristics, 
  endeavoring 
  thus 
  to 
  bring 
  into 
  close 
  contiguity 
  those 
  

   which 
  appeared 
  to 
  be 
  most 
  nearly 
  allied. 
  I 
  was 
  not 
  a 
  little 
  surprised 
  to 
  

   find 
  in 
  how 
  few 
  instances 
  it 
  was 
  possible 
  to 
  combine 
  the 
  brachypterous 
  

   and 
  macropterous 
  species 
  in 
  any 
  one 
  of 
  these 
  groups. 
  Even 
  in 
  most 
  

   of 
  these, 
  and 
  especially 
  in 
  the 
  dawsoni 
  series 
  (itself 
  somewhat 
  heter- 
  

   ogeneous 
  on 
  either 
  side), 
  the 
  collocation 
  is 
  rather 
  forced. 
  The 
  groups 
  

   into 
  which 
  I 
  have 
  divided 
  the 
  macropterous 
  forms 
  are 
  far 
  more 
  nat- 
  

   ural 
  than 
  those 
  of 
  the 
  brachypterous 
  species, 
  and 
  the 
  portion 
  of 
  the 
  

   table 
  relating 
  to 
  the 
  former 
  is 
  therefore 
  much 
  more 
  satisfactory 
  than 
  

   the 
  other. 
  I 
  have 
  more 
  than 
  once 
  completely 
  remodeled 
  that 
  relating 
  

   to 
  the 
  brachyi)terous 
  species, 
  but 
  with 
  no 
  greater 
  success 
  than 
  in 
  that 
  

   now 
  presented. 
  

  

  Much 
  to 
  my 
  surprise, 
  I 
  find 
  but 
  a 
  couple 
  of 
  species 
  in 
  this 
  genus 
  {M. 
  

   (Imcsoiii, 
  M. 
  marfiinatus) 
  in 
  which 
  there 
  is 
  complete 
  dimorphism 
  shown 
  

   in 
  the 
  full 
  development 
  on 
  the 
  one 
  hand 
  and 
  extreme 
  abbreviation 
  on 
  

   the 
  other 
  of 
  the 
  organs 
  of 
  flight. 
  In 
  other 
  species, 
  especially 
  in 
  M.fasci- 
  

   atus 
  and 
  M. 
  cxtrcmns, 
  there 
  is 
  considerable 
  variability, 
  but 
  nowhere 
  

   else 
  is 
  it 
  carried 
  to 
  tbis 
  extreme. 
  It 
  is, 
  however, 
  found 
  in 
  Dendroiettix, 
  

  

  I 
  

  

  