﻿NO. 
  1124. 
  REriSrOX 
  OF 
  the 
  MELAXOPLT—SCrnDER. 
  

  

  ANALYTICAL 
  KEY 
  TO 
  THE 
  GENERA 
  OF 
  NORTH 
  AMERICAN 
  MELANOPLI 
  

   (INCLUDING 
  THE 
  OLD 
  WORLD 
  FORMS). 
  ^ 
  

  

  A'. 
  Lateral 
  margins 
  of 
  subgenital 
  plate 
  (last 
  ventral 
  segment) 
  of 
  male, 
  as 
  seen 
  later- 
  

   ally, 
  straight 
  throughout, 
  or 
  very 
  slightly 
  convex, 
  never 
  at 
  all 
  abruptly 
  ampliate 
  

   at 
  the 
  base. 
  

  

  ¥. 
  Bony 
  exceptionally 
  slender; 
  mesosternal 
  lobes 
  subattingent 
  in 
  both 
  sexes 
  ; 
  pro- 
  

  

  zona 
  three 
  times 
  as 
  long 
  as 
  metazona 
  1. 
  Giimnoscirtetcs 
  (p. 
  14). 
  

  

  fc'. 
  Body 
  not 
  exceptionally 
  slender; 
  mesosternal 
  lobes 
  in 
  both 
  sexes 
  so 
  widely 
  sep- 
  

   arated 
  that 
  the 
  interspace 
  between 
  them 
  is 
  at 
  most 
  twice 
  as 
  long 
  as 
  broad 
  ; 
  prozona 
  

   not 
  more 
  than 
  twice 
  as 
  long 
  as 
  metazona. 
  

  

  c'. 
  Interspace 
  between 
  mesosternal 
  lobes 
  of 
  female 
  decidedly 
  transverse, 
  some- 
  

   times 
  twice 
  as 
  broad 
  as 
  long; 
  of 
  male 
  sometimes 
  transverse, 
  sometimes 
  quadrate 
  

   or 
  subquadrate; 
  tegmina 
  lobiform, 
  linear, 
  or 
  wanting. 
  

  

  d'. 
  Interspace 
  between 
  mesothoracic 
  lobes 
  of 
  male 
  decidedly 
  transverse, 
  as 
  

   broad 
  as 
  or 
  broader 
  than 
  the 
  lobes; 
  the 
  pronotum 
  without 
  lateral 
  carinae; 
  

  

  tegmina 
  ovate 
  or 
  wanting 
  2. 
  Xetrosonia 
  (p. 
  16). 
  

  

  (V. 
  Interspace 
  between 
  mesothoracic 
  lobes 
  of 
  male 
  quadrate 
  or 
  subquadrate, 
  

  

  or, 
  if 
  feebly 
  transverse 
  (as 
  in 
  Paradichroplus), 
  not 
  so 
  broad 
  as 
  the 
  lobes, 
  and 
  

  

  then 
  the 
  pronotum 
  furnished 
  with 
  lateral 
  carinae; 
  tegmina 
  ovate 
  or 
  linear. 
  

  

  e'. 
  Subgenital 
  plate 
  of 
  male 
  pyramidal, 
  pointed, 
  a 
  slight 
  tubercle 
  extending 
  

  

  beyond 
  its 
  posterior 
  margin, 
  but 
  the 
  margin 
  extending 
  well 
  beyond 
  the 
  apex 
  

  

  of 
  the 
  supraanal 
  plate 
  3. 
  raradichrojdiis 
  (p. 
  18). 
  

  

  €-. 
  Subgenital 
  plate 
  of 
  male 
  more 
  or 
  less 
  conically 
  protuberant 
  apically, 
  but 
  

   its 
  interior 
  apical 
  margin 
  not 
  surpassing 
  or 
  barely 
  surpassing 
  the 
  apex 
  of 
  the 
  

   supraanal 
  plate. 
  

   /'. 
  Apical 
  tubercle 
  of 
  subgenital 
  plate 
  small, 
  extending 
  but 
  a 
  short 
  dis- 
  

   tance 
  beyond 
  the 
  supraanal 
  plate; 
  cerci 
  of 
  male 
  abruptly 
  narrowed 
  before 
  

   the 
  middle 
  by 
  excision 
  of 
  the 
  inferior 
  margin, 
  the 
  apical 
  half 
  narrow; 
  lat- 
  

   eral 
  carinae 
  of 
  iironotum 
  wholly 
  wanting 
  4. 
  Phaedrotettix 
  (p. 
  22). 
  

  

  f'^. 
  Nearly 
  the 
  whole 
  subgenital 
  plate 
  forming 
  a 
  blunt 
  conical 
  tubercle 
  

   projecting 
  some 
  distance 
  beyond 
  the 
  supraanal 
  plate; 
  cerci 
  of 
  male 
  form- 
  

   ing 
  broad, 
  apically 
  decurved, 
  subfalcate 
  laminae; 
  lateral 
  carinae 
  of 
  pro- 
  

   notum 
  more 
  or 
  less 
  distinct 
  5. 
  Conalcaea 
  (p. 
  23.) 
  

  

  0-. 
  Interspace 
  between 
  u'esostcrnal 
  lobes 
  of 
  female 
  generally 
  longer 
  than 
  broad, 
  

   sometimes 
  quadrate 
  rarely 
  feebly 
  transverse*; 
  of 
  male 
  never 
  at 
  all 
  transverse 
  

   (except 
  feebly 
  in 
  Siualoa 
  and 
  Cephalotettix) 
  ; 
  tegmina 
  variable. 
  

   d^. 
  Tegmina 
  never 
  fully 
  developed, 
  rarely 
  as 
  long 
  as 
  the 
  pronotum, 
  lateral 
  

   and 
  ovate, 
  or 
  linear, 
  or 
  wholly 
  wanting; 
  hind 
  margin 
  of 
  jironotum 
  distinctly 
  

   truncate; 
  fore 
  and 
  middle 
  femora 
  of 
  male 
  (except 
  in 
  Phaulotettix) 
  distinctly 
  

   more 
  gibbous 
  than 
  in 
  the 
  female. 
  

  

  e'. 
  Furcula 
  of 
  male 
  wanting 
  or 
  forming 
  a 
  pair 
  of 
  brief 
  lobes 
  at 
  most 
  no 
  

   longer 
  than 
  broad. 
  

  

  ' 
  By 
  permission 
  of 
  the 
  Assistant 
  Secretary 
  this 
  key 
  has 
  been 
  issued 
  in 
  advance 
  in 
  

   the 
  Proceedings 
  of 
  the 
  American 
  Academy, 
  XXXII, 
  No. 
  9. 
  

  

  * 
  Cephalotettu, 
  in 
  which 
  the 
  female 
  is 
  unknown, 
  is 
  placed 
  in 
  this 
  division. 
  

  

  