﻿144 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol 
  xx, 
  

  

  a 
  little 
  contracted 
  in 
  tlie 
  middle; 
  furcula 
  consisting 
  of 
  a 
  pair 
  of 
  rather 
  

   distant, 
  moderately 
  slender, 
  scarcely 
  tapering, 
  blunt, 
  dark 
  deuticula- 
  

   tious, 
  overlying 
  tlie 
  outer 
  slopes 
  of 
  tlie 
  submedian 
  ridges 
  of 
  the 
  supra- 
  

   anal 
  plate, 
  and 
  extending 
  over 
  the 
  plate 
  by 
  only 
  a 
  little 
  more 
  than 
  the 
  

   length 
  of 
  the 
  last 
  dorsal 
  segment; 
  cerci 
  strongly 
  compressed 
  bull. 
  ite 
  

   just 
  beyoud 
  the 
  base, 
  tlie 
  buUate 
  portion 
  broader 
  than 
  long 
  and 
  exte 
  

   riorly 
  very 
  strongly 
  and 
  longitudinally 
  convex, 
  beneath 
  sulcate, 
  the 
  

   whole 
  bullate 
  portion 
  abruptly 
  narrowing 
  and 
  termiimting 
  in 
  a 
  com- 
  

   pressed, 
  indirected, 
  round-tipped, 
  equal 
  and 
  short 
  finger, 
  falling 
  a 
  little 
  

   short 
  of 
  the 
  tip 
  of 
  the 
  supraaiial 
  plate; 
  subgenital 
  plate 
  short, 
  sub- 
  

   conical, 
  and 
  apically 
  very 
  broad 
  by 
  the 
  abrupt 
  rounded 
  production 
  of 
  

   the 
  apical 
  margin, 
  the 
  i)rocess 
  of 
  about 
  equal 
  height 
  and 
  posterior 
  

   breadth, 
  entire. 
  

  

  Length 
  of 
  body, 
  male, 
  16 
  mm., 
  female, 
  22 
  mm.; 
  antennae, 
  male, 
  6.5 
  

   mm. 
  (est.), 
  female, 
  6 
  mm.; 
  tegmlna, 
  male 
  and 
  female, 
  6 
  mm.; 
  hind 
  

   femora, 
  male, 
  10.25 
  mm., 
  female, 
  12 
  mm. 
  

  

  One 
  male, 
  4 
  females. 
  Souora, 
  Mexico, 
  A. 
  Schott, 
  Mexican 
  Boundary 
  

   Survey. 
  

  

  This 
  species 
  differs 
  from 
  the 
  preceding 
  two 
  in 
  the 
  uniformity 
  of 
  the 
  

   pronotum, 
  which 
  does 
  not 
  expand 
  posteriorly, 
  and 
  has 
  a 
  uniformly 
  

   sharp 
  median 
  carina 
  throughout; 
  it 
  is 
  also 
  lighter 
  bodied 
  and 
  less 
  

   heavily 
  marked. 
  

  

  2. 
  FLABELLIFER 
  SERIES. 
  

  

  In 
  this 
  series, 
  one 
  of 
  the 
  few 
  which 
  combines 
  macropterous 
  and 
  bra- 
  

   chypterous 
  forms, 
  the 
  male 
  prozona 
  is 
  feebly 
  or 
  distinctly 
  longitudinal, 
  

   occasionally 
  quadrate, 
  the 
  interspace 
  between 
  the 
  mesosternal 
  lobes 
  of 
  

   the 
  same 
  sex 
  varying 
  from 
  quadrate 
  to 
  half 
  as 
  long 
  again 
  as 
  broad, 
  or 
  

   somewhat 
  more. 
  The 
  tegmina 
  are 
  either 
  fully 
  developed, 
  though 
  at 
  

   most 
  but 
  slightly 
  surpassing 
  the 
  hind 
  femora, 
  much 
  and 
  irregularly 
  

   maculate; 
  or 
  half 
  as 
  long 
  as 
  the 
  abdomen, 
  heavily 
  marked 
  in 
  the 
  dis- 
  

   coidal 
  field 
  and 
  subacuminate; 
  or 
  shorter 
  than 
  the 
  pronotum 
  and 
  then 
  

   apically 
  rounded. 
  The 
  length 
  of 
  the 
  tegmina 
  in 
  each 
  species, 
  however, 
  

   is 
  fixed. 
  The 
  hind 
  tibiae 
  are 
  blue, 
  with 
  nine 
  to 
  eleven 
  spines 
  in 
  the 
  

   outer 
  series, 
  or, 
  in 
  some 
  brachypterous 
  forms, 
  red, 
  with 
  ten 
  to 
  thirteen 
  

   spines 
  in 
  the 
  outer 
  series. 
  

  

  The 
  supraanal 
  plate 
  is 
  triangular, 
  rather 
  longer 
  than 
  broad, 
  with 
  no 
  

   or 
  slightly 
  developed 
  transverse 
  ridges. 
  The 
  furcula 
  is 
  minute 
  or 
  sub- 
  

   obsolete, 
  except 
  in 
  a 
  single 
  instance 
  where 
  it 
  is 
  small. 
  The 
  cerci 
  are 
  

   broad, 
  often 
  excessively 
  broad 
  and 
  fiabellate, 
  enlarging 
  from 
  tlie 
  base 
  

   toward 
  the 
  middle, 
  at 
  least 
  in 
  the 
  macropterous 
  forms, 
  rarely 
  as 
  much 
  

   as 
  twice 
  as 
  long 
  as 
  broad, 
  broadly 
  rounded 
  apically. 
  The 
  subgeuital 
  

   plate 
  is 
  short 
  and 
  broad, 
  sometimes 
  with 
  a 
  slight 
  apical 
  tubercle, 
  the 
  

   lateral 
  margins 
  straight, 
  the 
  apical 
  margin 
  not 
  elevated, 
  or 
  only 
  in 
  a 
  

   single 
  instance. 
  

  

  M. 
  rUeyamis 
  is 
  the 
  most 
  aberrant 
  form, 
  having 
  very 
  brief 
  tegmina, 
  

  

  