﻿8 
  rROCEEDINdS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  single 
  genus 
  Melanoplus. 
  The 
  sexes 
  are 
  nearly 
  equally 
  divided, 
  the 
  

   males 
  forming 
  about 
  forty-six 
  per 
  cent 
  of 
  tlie 
  whole. 
  Thirty 
  genera 
  

   (eighteen 
  new) 
  and 
  two 
  hundred 
  and 
  seven 
  species 
  (one 
  hundred 
  and 
  

   fifteen 
  new) 
  are 
  described 
  in 
  the 
  present 
  paper. 
  

  

  Finally, 
  by 
  the 
  aid 
  of 
  a 
  grant 
  from 
  the 
  Elizabeth 
  Thompson 
  Sci- 
  

   ence 
  Fund 
  I 
  liave 
  been 
  able 
  to 
  procure 
  illustrations 
  of 
  the 
  abdominal 
  

   appendages 
  of 
  every 
  avaiable 
  species. 
  

  

  A 
  few 
  words 
  should 
  be 
  added 
  regarding 
  certain 
  details 
  of 
  presenta- 
  

   tion: 
  Instead 
  of 
  giving 
  the 
  range 
  of 
  variation 
  in 
  the 
  measurements 
  of 
  

   each 
  species, 
  I 
  have 
  selected 
  as 
  far 
  as 
  possible 
  typical 
  average 
  speci- 
  

   mens, 
  male 
  and 
  female, 
  for 
  the 
  purpose, 
  taking 
  the 
  measurements 
  of 
  all 
  

   parts 
  from 
  the 
  same 
  individuals. 
  Tlie 
  number 
  of 
  individuals 
  of 
  each 
  

   species 
  seen 
  is 
  given, 
  and 
  the 
  localities 
  from 
  which 
  they 
  came 
  immedi- 
  

   ately 
  added, 
  with 
  the 
  name 
  of 
  tlie 
  collector 
  (when 
  not 
  myself), 
  and 
  

   when 
  not 
  from 
  my 
  own 
  collection, 
  the 
  source 
  from 
  which 
  I 
  have 
  received 
  

   them 
  stated 
  (in 
  parentheses) 
  5 
  occasionally 
  my 
  own 
  name 
  is 
  there 
  

   added, 
  when 
  specimens 
  from 
  the 
  same 
  source 
  are 
  also 
  found 
  in 
  my 
  col- 
  

   lection 
  ; 
  where 
  no 
  parenthesis 
  follows 
  the 
  locality, 
  the 
  specimens 
  referred 
  

   to 
  are 
  in 
  my 
  collection. 
  

  

  In 
  describing 
  the 
  abdominal 
  appendages 
  of 
  the 
  males, 
  I 
  have 
  found 
  

   it 
  convenient 
  to 
  introduce 
  a 
  few 
  new 
  terms. 
  These 
  are: 
  Furcula 
  for 
  

   the 
  pair 
  of 
  backward-directed 
  apophyses 
  of 
  the 
  last 
  dorsal 
  segment, 
  

   which 
  overlie, 
  generally 
  in 
  a 
  more 
  or 
  less 
  forked 
  position, 
  the 
  base 
  of 
  

   the 
  supraanal 
  plate; 
  infracercal 
  plates 
  for 
  the 
  variously 
  developed 
  but 
  

   generally 
  inconspicuous 
  paired 
  plates, 
  which 
  underlie 
  in 
  part 
  the 
  cerci, 
  

   in 
  part 
  the 
  lateral 
  portions 
  of 
  the 
  supraanal 
  plate: 
  and 
  paUimn 
  for 
  the 
  

   sometimes 
  erectile, 
  membranous 
  pellicle 
  i)artially 
  closing 
  the 
  open 
  

   cavity 
  formed 
  of 
  the 
  walls 
  of 
  the 
  subgenital 
  plate, 
  and 
  variously 
  devel- 
  

   oped 
  in 
  the 
  different 
  genera. 
  

  

  December 
  20, 
  1895. 
  

  

  Note. 
  — 
  The 
  exclamation 
  point 
  employed 
  in 
  the 
  synonymy 
  of 
  the 
  species 
  has 
  its 
  usual 
  

   significance 
  — 
  that 
  the 
  reference 
  is 
  authoritative 
  from 
  an 
  examination 
  of 
  the 
  original 
  

   types 
  of 
  the 
  author 
  in 
  the 
  passage 
  referred 
  to, 
  with 
  the 
  present 
  paper 
  in 
  view. 
  

  

  