﻿6 
  PliOCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  xx. 
  

  

  developed 
  tegmina, 
  as 
  the 
  case 
  may 
  be 
  ; 
  but 
  all 
  the 
  larger 
  genera 
  (except- 
  

   iug 
  Bradynotes) 
  and 
  some 
  of 
  the 
  smaller 
  show 
  considerable 
  diversity 
  in 
  

   this 
  resi)ect; 
  the 
  greatest 
  difference 
  between 
  different 
  members 
  of 
  the 
  

   same 
  genus 
  obtains 
  in 
  the 
  two 
  largest 
  genera: 
  MeJanoplus. 
  where 
  the 
  

   si)e(,'ies 
  may 
  range 
  from 
  those 
  with 
  merely 
  lateral 
  pads 
  to 
  tliose 
  with 
  

   tegmina 
  far 
  surpassing 
  the 
  hind 
  femora; 
  and 
  Fodisma, 
  where 
  tliey 
  

   range 
  I'roiu 
  apterous 
  species 
  to 
  those 
  with 
  tegmina 
  luilf 
  as 
  long 
  as 
  the 
  

   abdomen. 
  l>ut 
  this 
  range 
  is 
  not 
  confined 
  to 
  the 
  larger 
  genera, 
  for 
  sev- 
  

   eral 
  uiouotypic 
  genenci 
  {Dendrotettix, 
  Phoct((liofes, 
  and 
  Oeddleonotiis) 
  dis- 
  

   play 
  a 
  wide 
  difference 
  between 
  different 
  forms 
  of 
  the 
  single 
  species 
  they 
  

   possess, 
  in 
  the 
  length 
  of 
  the 
  tegmina, 
  a 
  difference 
  which 
  is 
  also 
  paral- 
  

   leled 
  or 
  almost 
  paralleled 
  among 
  certain 
  species 
  of 
  the 
  genera 
  Hespero- 
  

   tetfi.r, 
  Fodisma, 
  Melanoplus, 
  and 
  T'aroxya, 
  and 
  particularly 
  of 
  the 
  genus 
  

   Mdanopliis. 
  

  

  This 
  last 
  genus 
  is 
  of 
  particular 
  interest 
  in 
  this 
  connection, 
  for 
  it 
  is 
  

   subequally 
  divided 
  between 
  distinctly 
  short-winged 
  and 
  distinctly 
  long- 
  

   winged 
  forms, 
  which 
  only 
  rarely 
  appear 
  to 
  be 
  closely 
  allied; 
  yet 
  in 
  four 
  

   of 
  the 
  species, 
  .1/. 
  d<(iv,soni, 
  M. 
  marginatiis, 
  M. 
  fascia 
  tus, 
  and 
  M. 
  extremuH 
  — 
  

   species 
  in 
  no 
  way 
  closely 
  related 
  — 
  there 
  is 
  a 
  marked 
  dimorphism 
  in 
  

   respect 
  of 
  the 
  length 
  of 
  the 
  tegmina, 
  the 
  first 
  two 
  being 
  normally 
  pos- 
  

   sessed 
  of 
  tegmiiui 
  only 
  slightly 
  longer 
  than 
  the 
  pronotum, 
  the 
  last 
  two 
  

   of 
  tegmina 
  hardly 
  as 
  long, 
  if 
  as 
  long, 
  as 
  the 
  abdomen, 
  but 
  all 
  occasion- 
  

   ally 
  equipped 
  with 
  tegmina 
  distinctly 
  surpassing 
  the 
  hind 
  femora. 
  

   When, 
  however, 
  we 
  compare 
  these 
  fully 
  developed 
  tegmina 
  (Plate 
  I, 
  figs, 
  

   fl, 
  (', 
  /, 
  I) 
  either 
  with 
  the 
  abbreviated 
  tegmina 
  of 
  the 
  same 
  species, 
  as 
  in 
  

   M. 
  extremxs 
  (Plate 
  I, 
  fig. 
  y), 
  or 
  with 
  those 
  of 
  their 
  nearest 
  macropterous 
  

   allies, 
  M. 
  yladstoni 
  (Plate 
  I, 
  fig. 
  6), 
  M.paroxy 
  aides 
  (Plate 
  I, 
  fig. 
  A;), 
  and 
  

   M. 
  borealis 
  (Plate 
  I, 
  fig. 
  d), 
  as 
  in 
  the 
  other 
  species, 
  we 
  can 
  not 
  fail 
  to 
  be 
  

   struck 
  by 
  the 
  common 
  differences 
  which 
  separate 
  these 
  abnormal 
  macrop- 
  

   terous 
  tegmina 
  from 
  the 
  normal 
  tegmina 
  of 
  the 
  genus. 
  (See 
  further 
  the 
  

   tegmina 
  of 
  the 
  type 
  of 
  the 
  genus, 
  j\[. 
  femnr-rnhrHm, 
  Plate 
  I, 
  fig. 
  h.). 
  

   Instead 
  of 
  the 
  regularly 
  tapering 
  form 
  normal 
  to 
  the 
  genus, 
  the 
  added 
  

   portion, 
  which 
  is 
  largely 
  the 
  extension 
  of 
  the 
  region 
  beyond 
  the 
  post- 
  

   radial 
  intercalary 
  area, 
  is 
  nearly 
  equal, 
  giving 
  tiie 
  tegmina 
  a 
  consider- 
  

   ably 
  greater 
  apical 
  breadth 
  and 
  a 
  conseipient 
  openness 
  of 
  neuration, 
  

   besides 
  a 
  less 
  tapering 
  form. 
  What 
  is 
  further 
  to 
  be 
  noticed 
  is 
  that 
  this 
  

   apical 
  breadth 
  and 
  openness 
  of 
  neuration 
  is 
  also 
  the 
  characteristic 
  of 
  

   several 
  cases 
  in 
  other 
  genera 
  where 
  there 
  is 
  simdar 
  <limori»hism 
  in 
  length 
  

   of 
  tegmina, 
  as 
  in 
  Dendroiettix 
  querciis, 
  Padisma 
  alpiiia, 
  and 
  I'hoetaliotes 
  

   nehrascoifiis 
  (Plate 
  I, 
  fig. 
  c). 
  In 
  Padisma 
  the 
  most 
  abbreviated 
  form 
  ot 
  

   wing 
  is 
  plainly 
  normal, 
  and 
  1 
  am 
  therefore 
  inclined 
  from 
  these 
  examples 
  

   to 
  regard 
  the 
  abbreviated 
  as 
  the 
  normal 
  form 
  in 
  Ik-ndratcttix, 
  Phoefa- 
  

   liotes, 
  and 
  the 
  species 
  of 
  Mclanopliis 
  (except, 
  of 
  course, 
  Al.femiir-ntl>rnni) 
  

   here 
  dlustrated. 
  The 
  same, 
  however, 
  is 
  not 
  the 
  case 
  in 
  Oedaleanotus^ 
  

   where 
  dimori)hism 
  of 
  simihir 
  degree 
  is 
  found, 
  and 
  it 
  is 
  therefore 
  prob- 
  

  

  