﻿No.n24. 
  REVISION 
  OF 
  THE 
  MELAXOI'LI—SC 
  IDDER. 
  301 
  

  

  apical 
  third 
  as 
  parallel, 
  cylindrical 
  but 
  taperiug, 
  acuminate 
  needles^ 
  

   reaching 
  to 
  the 
  distal 
  end 
  of 
  the 
  middle 
  third 
  of 
  tlie 
  siipraanal 
  plate; 
  

   cerci 
  slender 
  feebly 
  compressed 
  laminae, 
  rapidly 
  narrowing 
  on 
  basal 
  

   third, 
  the 
  middle 
  third 
  equal, 
  hardly 
  compressed 
  and 
  half 
  as 
  broad 
  as 
  

   extreme 
  base, 
  tlien 
  expanding 
  to 
  a 
  nearly 
  equal 
  extent 
  to 
  form 
  a 
  com- 
  

   pressed, 
  spatulate, 
  incurved 
  tip, 
  the 
  apical 
  portion 
  of 
  which 
  is 
  very 
  

   strongly 
  compressed 
  and 
  not 
  incurved; 
  infracercal 
  plates 
  broadly 
  

   rounded 
  apically, 
  as 
  long 
  as 
  the 
  supraanal 
  plate; 
  subgenital 
  j)late 
  mod- 
  

   erately 
  broad, 
  subequal 
  in 
  breadth, 
  considerably 
  longer 
  than 
  broad, 
  

   feebly 
  flaring, 
  the 
  apical 
  margin 
  very 
  broadly 
  and 
  feebly 
  elevated, 
  well 
  

   rounded 
  l)ut 
  feebly 
  angulate, 
  entire. 
  

  

  Length 
  of 
  body, 
  male, 
  2.") 
  mm., 
  female, 
  28 
  mm.; 
  antennae, 
  male, 
  12.."> 
  

   mm.; 
  tegmina, 
  male, 
  19? 
  mm., 
  female, 
  21 
  mm.; 
  hind 
  femoia, 
  male, 
  12.75 
  

   mm., 
  female, 
  14.25 
  mm. 
  

  

  One 
  male, 
  1 
  female. 
  Grand 
  Canyon 
  of 
  the 
  Colorado, 
  Arizona, 
  July 
  

   10 
  (L. 
  Bruner). 
  

  

  This 
  species 
  is 
  rather 
  closely 
  allied 
  to 
  the 
  last, 
  I\I. 
  cotnplanatipes, 
  but 
  

   is 
  easily 
  distinguished 
  from 
  it 
  by 
  its 
  less 
  strongly 
  compressed 
  hind 
  

   femora 
  with 
  their 
  bifasciate 
  markings. 
  The 
  differences 
  in 
  the 
  abdom- 
  

   inal 
  appendages 
  are 
  slight, 
  but 
  are 
  found 
  at 
  every 
  point. 
  

  

  21. 
  ANGUSTIPENNIS 
  SERIES. 
  

  

  A 
  very 
  homogeneous 
  group 
  (and 
  one 
  very 
  closely 
  allied 
  to 
  the 
  pre- 
  

   ceding), 
  in 
  which 
  the 
  prozona 
  of 
  the 
  male 
  is 
  variable, 
  and 
  the 
  interval 
  

   between 
  the 
  mesosternal 
  lobes 
  in 
  the 
  same 
  sex 
  varies 
  from 
  a 
  little 
  

   longer 
  to 
  several 
  times 
  longer 
  than 
  broad. 
  The 
  tegmina 
  are 
  always 
  

   fully 
  develoi)ed 
  and 
  reach 
  or 
  somewhat 
  surpass 
  the 
  tips 
  of 
  the 
  hind 
  

   femora. 
  The 
  hind 
  tibiae 
  are 
  red 
  or 
  glaucous 
  and 
  have 
  from 
  nine 
  to 
  

   thirteen 
  spines 
  in 
  the 
  outer 
  series. 
  

  

  The 
  supraanal 
  i)late 
  is 
  long 
  and 
  rounded 
  triangular, 
  and 
  preapically 
  

   contracted 
  somewhat 
  conspicuously. 
  The 
  furcula 
  consists 
  of 
  a 
  pair 
  of 
  

   slender, 
  tapering, 
  acuminate 
  fingers 
  of 
  considerable 
  length, 
  generrJIy 
  

   extending 
  over 
  a 
  third 
  of 
  the 
  supraanal 
  plate. 
  The 
  cerci 
  are 
  rather 
  

   short 
  and 
  rather 
  slender, 
  incurved 
  or 
  inbent 
  apically, 
  spatulate, 
  not 
  

   nearly 
  reaching 
  the 
  tip 
  of 
  the 
  supraanal 
  plate. 
  The 
  subgenital 
  plate 
  is 
  

   large, 
  fully 
  as 
  broad 
  as 
  long, 
  not 
  or 
  but 
  little 
  elevated 
  apically 
  and 
  

   there 
  usually 
  feebly 
  notched. 
  

  

  The 
  species, 
  only 
  four 
  in 
  number, 
  are 
  of 
  medium 
  or 
  rather 
  small, 
  

   occasionally 
  rather 
  large 
  size, 
  and 
  occur 
  from 
  Iowa 
  to 
  Utah, 
  and 
  from 
  

   Montana 
  and 
  Manitoba 
  to 
  Texas, 
  though 
  one 
  species 
  ranges 
  as 
  far 
  east 
  

   as 
  Sudbury, 
  Ontario 
  — 
  the 
  only 
  one 
  found 
  east 
  of 
  the 
  Mississippi. 
  They 
  

   occur 
  mostly 
  in 
  the 
  region 
  between 
  the 
  Kocky 
  Mountains 
  and 
  the 
  Mis- 
  

   sissippi. 
  

  

  