﻿220 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  xx 
  

  

  ill 
  the 
  male, 
  broadening 
  a 
  little 
  anteriorly; 
  frontal 
  costa 
  faintly 
  wider 
  

   tluin 
  the 
  interspace 
  between 
  the 
  eyes, 
  equal, 
  fading 
  just 
  before 
  the 
  

   elypeus, 
  feebly 
  sulcate 
  at 
  and 
  below 
  the 
  ocellus, 
  punctate 
  above; 
  eyes 
  

   rather 
  large 
  and 
  rather 
  prominent, 
  particularly 
  in 
  the 
  male, 
  half 
  as 
  

   long 
  again 
  as 
  the 
  infraocular 
  portion 
  of 
  the 
  genae 
  ; 
  antennae 
  ( 
  ?). 
  Prono- 
  

   tum 
  feebly 
  enlarging 
  on 
  the 
  metazona, 
  the 
  lateral 
  lobes 
  with 
  only 
  

   broken 
  signs 
  of 
  a 
  postocular 
  dark 
  band 
  on 
  the 
  prozona, 
  the 
  disk 
  very 
  

   broadly 
  convex, 
  ])assing 
  by 
  a 
  distinct 
  rounded 
  angle, 
  forming 
  a 
  feeble 
  

   lateral 
  carina, 
  into 
  the 
  rounded 
  subvertical 
  lateral 
  lobes; 
  median 
  carina 
  

   distinct 
  but 
  slight 
  on 
  the 
  metazona, 
  subobsolete 
  or 
  obsolete 
  on 
  the 
  pro- 
  

   zona; 
  front 
  margin 
  truncate, 
  hind 
  margin 
  strongly 
  obtusangulate; 
  

   prozona 
  feebly 
  transverse, 
  but 
  little 
  longer 
  than 
  the 
  densely 
  and 
  not 
  

   very 
  finely 
  punctate 
  metazona. 
  Prosternal 
  spine 
  moderately 
  long, 
  rather 
  

   slender, 
  at 
  least 
  in 
  the 
  male, 
  conical, 
  erect; 
  interspace 
  between 
  meso- 
  

   sternal 
  lobes 
  nearly 
  twice 
  as 
  long 
  as 
  broad 
  (male) 
  or 
  quadrate 
  (female). 
  

   Tegmina 
  as 
  long 
  as 
  or 
  slightly 
  longer 
  than 
  the 
  pronotum, 
  ovate, 
  moder- 
  

   ately 
  broad, 
  attingent 
  or 
  overlapping, 
  apically 
  acuminate. 
  Fore 
  and 
  

   middle 
  femora 
  a 
  little 
  tumid 
  in 
  the 
  male; 
  hind 
  femora 
  not 
  very 
  long, 
  

   somewhat 
  compressed, 
  uniform 
  light 
  testaceous, 
  with 
  fuscous 
  genicular 
  

   arc; 
  hind 
  tibiae 
  light 
  testaceous, 
  the 
  apical 
  half 
  of 
  the 
  spines 
  black, 
  nine 
  

   to 
  ten 
  in 
  number 
  in 
  the 
  outer 
  series. 
  Extremity 
  of 
  male 
  abdomen 
  

   hardly 
  clavate, 
  a 
  little 
  recurved, 
  the 
  supraaual 
  plate 
  triangular, 
  with 
  

   acutangulate 
  apex, 
  the 
  surface 
  nearly 
  plane, 
  except 
  that 
  it 
  sweeps 
  up 
  to 
  

   the 
  sharp, 
  elevated, 
  and 
  apically 
  united 
  submedian 
  ridges 
  inclosing 
  a 
  

   very 
  narrow 
  and 
  deep 
  median 
  sulcus, 
  which 
  crosses 
  two-thirds 
  of 
  the 
  

   plate; 
  furcula 
  consisting 
  of 
  a 
  pair 
  of 
  approximate, 
  small, 
  triangular 
  

   denticulations, 
  no 
  longer 
  than 
  the 
  last 
  dorsal 
  segment, 
  overlying 
  the 
  

   ridges 
  of 
  the 
  supraanal 
  plate; 
  cerci 
  small, 
  subfalciform, 
  tapering 
  to 
  two- 
  

   thirds 
  the 
  basal 
  width 
  on 
  proximal 
  half, 
  beyond 
  equal, 
  bent 
  a 
  little 
  

   inward 
  and 
  curved 
  upward, 
  exteriorly 
  sulcate, 
  apically 
  rounded, 
  much 
  

   shorter 
  than 
  the 
  supraanal 
  plate; 
  subgenital 
  plate 
  small, 
  feebly 
  sub- 
  

   conical, 
  projecting 
  slightly, 
  the 
  apical 
  margin 
  rising 
  very 
  feebly 
  to 
  an 
  

   obscure 
  apical 
  tubercle, 
  and 
  as 
  seen 
  from 
  above 
  with 
  a 
  parabolic 
  curve, 
  

   entire. 
  

  

  Length 
  of 
  body, 
  male, 
  14 
  mm., 
  female, 
  20 
  mm. 
  ; 
  tegmina, 
  male, 
  3.5 
  mm., 
  

   female, 
  5.5 
  mm.; 
  hind 
  femora, 
  female, 
  12 
  mm. 
  

  

  One 
  male, 
  1 
  female. 
  Cape 
  St. 
  Lucas, 
  Lower 
  California, 
  J. 
  Xantus. 
  

   The 
  single 
  pair 
  are 
  somewhat 
  broken 
  and 
  have 
  been 
  bleached 
  in 
  alcohol, 
  

   so 
  that 
  the 
  colors 
  of 
  the 
  above 
  description 
  will 
  have 
  to 
  be 
  i-evised 
  with 
  

   fresh 
  material. 
  

  

  12. 
  DAWSONI 
  SERIES. 
  

  

  This 
  group 
  is 
  composed 
  of 
  rather 
  heterogeneous 
  material 
  if 
  the 
  raa- 
  

   cropterous 
  forms 
  alone 
  are 
  considered, 
  and 
  is 
  even 
  more 
  loosely 
  com- 
  

   pacted 
  when 
  the 
  brachypterous 
  species 
  are 
  mingled 
  with 
  them. 
  In 
  

   size 
  they 
  range 
  from 
  rather 
  small 
  to 
  medium. 
  A 
  single 
  species 
  is 
  

   dimorphic, 
  being 
  both 
  brachypterous 
  and 
  macropterous. 
  

  

  