﻿258 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.xx. 
  

  

  Length 
  of 
  body, 
  male, 
  17.5 
  mm. 
  ; 
  tegmiua, 
  4 
  mm. 
  ; 
  hiud 
  femora, 
  9.5 
  mm. 
  

  

  Two 
  males. 
  Dingo 
  Bluft, 
  North 
  Carolina, 
  November 
  15, 
  Parker- 
  

   May 
  uard. 
  

  

  In 
  general 
  appearance 
  this 
  insect 
  has 
  a 
  strong 
  resemblance 
  to 
  M. 
  

   attenuatus 
  from 
  the 
  same 
  region. 
  

  

  17. 
  FASCIATUS 
  SERIES. 
  

  

  This 
  group 
  is 
  not 
  very 
  homogeneous, 
  comi)rising 
  forms 
  of 
  comsider- 
  

   nble 
  difference 
  in 
  appearance 
  and 
  structure, 
  but 
  which 
  have 
  a 
  number 
  

   of 
  important 
  points 
  in 
  common. 
  It 
  is 
  composed 
  in 
  part 
  of 
  brachypter- 
  

   ous 
  and 
  in 
  part 
  of 
  macropterous 
  forms. 
  One 
  species 
  is 
  dimorphic 
  in 
  

   tbis 
  respect, 
  and 
  the 
  others, 
  whether 
  macropterous 
  (one 
  only} 
  or 
  

   brachypterous 
  (six 
  in 
  numl)er), 
  are 
  exceptionally 
  short-winged 
  or 
  

   exceptionally 
  long-winged 
  for 
  their 
  type. 
  The 
  antenuae 
  are 
  very 
  vari- 
  

   able 
  in 
  length, 
  being 
  sometimes 
  quite 
  similar, 
  sometimes 
  quite 
  dissimi- 
  

   lar, 
  in 
  the 
  two 
  sexes 
  and 
  varying 
  in 
  the 
  male 
  from 
  three-fifths 
  as 
  long- 
  

   as 
  the 
  bind 
  femora 
  to 
  equal 
  their 
  length, 
  and 
  in 
  the 
  female 
  from 
  one- 
  

   half 
  to 
  four-fifths 
  the 
  length 
  of 
  the 
  hind 
  femora. 
  In 
  size 
  they 
  range 
  

   from 
  very 
  small 
  to 
  a 
  little 
  above 
  the 
  medium. 
  

  

  The 
  prozona 
  of 
  the 
  male 
  varies 
  from 
  quadrate 
  to 
  longitudinal 
  in 
  

   both 
  brachypterous 
  and 
  macropterous 
  forms. 
  The 
  intervSpace 
  between 
  

   the 
  mesosternal 
  lobes 
  in 
  the 
  same 
  sex 
  is 
  also 
  very 
  variable 
  in 
  each 
  set 
  

   of 
  forms, 
  and 
  in 
  both 
  together 
  ranges 
  from 
  a 
  little 
  ti'ansverse 
  to 
  twice 
  

   as 
  long 
  as 
  broad. 
  The 
  tegmina 
  in 
  the 
  brachypterous 
  forms 
  are 
  usually 
  

   comparable 
  with 
  the 
  length 
  of 
  the 
  pronotum 
  and 
  are 
  well 
  rounded, 
  but 
  

   in 
  the 
  dimorphic 
  form 
  they 
  are 
  apically 
  subacumiuate 
  and 
  twice 
  as 
  long 
  

   as 
  the 
  pronotum 
  (as 
  in 
  one 
  of 
  the 
  brachypterous 
  forms) 
  or 
  far 
  surpass 
  

   the 
  hind 
  femora 
  and 
  are 
  broad 
  and 
  well 
  rounded 
  apically; 
  while 
  in 
  the 
  

   single 
  macropterous 
  form 
  they 
  barelj' 
  reach 
  the 
  tip 
  of 
  the 
  hind 
  femora. 
  

   The 
  hind 
  tibiae 
  are 
  likewise 
  very 
  variable 
  in 
  color, 
  sometimes 
  within 
  the 
  

   species, 
  and 
  have 
  from 
  nine 
  to 
  twelve, 
  usually 
  eleven, 
  spines 
  in 
  the 
  

   outer 
  series. 
  

  

  The 
  supraaiuil 
  plate 
  is 
  generally 
  rather 
  loug 
  triangular, 
  and 
  rather 
  

   flat, 
  with 
  but 
  feebly 
  elevated 
  margins, 
  except 
  in 
  one 
  instance, 
  where 
  it 
  

   is 
  strongly 
  compressed 
  apically. 
  The 
  furcula 
  is 
  usually 
  very 
  feebly 
  

   developed, 
  but 
  three 
  species 
  have 
  slender 
  fingers 
  extending 
  some 
  dis- 
  

   tance 
  over 
  the 
  supraanal 
  plate. 
  The 
  cerci 
  are 
  rather 
  large, 
  compressed, 
  

   generally 
  incurved 
  laminae, 
  generally 
  of 
  considerable 
  breadth, 
  but 
  in 
  

   one 
  instance 
  exceptionally 
  slender, 
  generally 
  more 
  or 
  less 
  constricted 
  

   niesially, 
  in 
  two 
  species 
  greatly, 
  and, 
  with 
  a 
  single 
  exception, 
  enlarged 
  

   again 
  apically, 
  rounded 
  and 
  not 
  acuminate 
  (in 
  one 
  species 
  emarginate) 
  

   at 
  tip. 
  The 
  subgenital 
  plate 
  again 
  varies 
  much, 
  but 
  is 
  always 
  longer 
  

   than 
  broad, 
  generally 
  moderately 
  broad 
  and 
  nearly 
  equal 
  and 
  usually 
  

   a 
  little 
  elevated 
  apically, 
  the 
  apical 
  margin 
  always 
  entire. 
  

  

  The 
  eight 
  species 
  have 
  as 
  little 
  geographical 
  as 
  structural 
  relation. 
  

   One 
  is 
  known 
  only 
  from 
  the 
  extreme 
  north 
  in 
  Labrador 
  and 
  Greenland: 
  

  

  