﻿TWO 
  NEW 
  NAUCORID 
  BUGS 
  — 
  LA 
  RIVERS 
  

  

  mesotibia. 
  All 
  tarsi, 
  except 
  protarsi, 
  3 
  -segmented 
  ; 
  the 
  first 
  seg- 
  

   ment 
  minute 
  ; 
  the 
  last 
  two 
  long 
  and 
  slender, 
  terminating 
  in 
  two 
  mod- 
  

   erately 
  curved 
  claws. 
  

  

  Type 
  and 
  paratopes.— 
  VSKM. 
  60987. 
  

  

  Type 
  locality. 
  — 
  New 
  Mexico, 
  Sierra 
  County, 
  Hot 
  Springs. 
  

  

  Material 
  examined. 
  — 
  Holotype 
  (male), 
  allotype, 
  and 
  four 
  para- 
  

   types, 
  collected 
  by 
  Loew, 
  September 
  11, 
  1874 
  (P. 
  R, 
  Uhler 
  collection), 
  

   in 
  U. 
  S. 
  National 
  Museum. 
  

  

  Remarks. 
  — 
  This 
  unique 
  little 
  species, 
  discovered 
  during 
  the 
  course 
  

   of 
  checking 
  the 
  Ambrysi 
  in 
  the 
  National 
  collection, 
  is 
  probably 
  an 
  

   offshoot, 
  as 
  far 
  as 
  present 
  material 
  can 
  indicate, 
  of 
  Aimbrysus 
  morTnon 
  

   stock. 
  The 
  female 
  subgenital 
  plate 
  is 
  mormonoid 
  in 
  structure, 
  and 
  

   the 
  variable 
  7normo7i-ty'pe 
  male 
  process 
  could 
  easily 
  have 
  given 
  rise 
  

  

  Figure 
  1. 
  — 
  Diagnostic 
  characteristics 
  of 
  Ambrysus 
  bispinus 
  and 
  A. 
  thermarum: 
  a. 
  Apex 
  

   of 
  subgenital 
  plate 
  of 
  A. 
  bispinus, 
  female 
  holotype 
  (visible 
  only 
  in 
  ventral 
  view), 
  X22; 
  

   b, 
  apex 
  of 
  subgenital 
  plate 
  of 
  A. 
  thermarum, 
  female 
  allotype, 
  X22; 
  c, 
  genital 
  process 
  on 
  

   caudal 
  edge 
  of 
  tergite 
  V 
  of 
  A. 
  thermarum, 
  male 
  holotype, 
  X22; 
  d, 
  bispinate 
  condition 
  

   of 
  left 
  connexivum 
  of 
  abdominal 
  sternite 
  V 
  of 
  A. 
  bispinus, 
  female 
  holotype, 
  showing 
  (1) 
  

   anterior 
  posterolateral 
  angle 
  and 
  (2) 
  posterior 
  laterocaudal 
  angle 
  (ventral 
  view, 
  with 
  

   caudal 
  tip 
  of 
  abdomen 
  oriented 
  at 
  the 
  top 
  of 
  the 
  field), 
  X22. 
  

  

  to 
  the 
  distinctive 
  male 
  process 
  of 
  A. 
  thermarum, 
  which 
  has 
  evolved 
  

   toward 
  the 
  A. 
  woodhuryi 
  type 
  to 
  such 
  an 
  extent 
  that, 
  with 
  only 
  the 
  

   male 
  to 
  examine, 
  it 
  would 
  have 
  been 
  considered 
  an 
  aberrant 
  A. 
  wood- 
  

   huryi. 
  At 
  present, 
  it 
  is 
  the 
  most 
  definitely 
  adapted 
  thermal 
  ecad 
  of 
  

   the 
  A. 
  mormon 
  type, 
  but 
  as 
  nothing 
  is 
  known 
  of 
  the 
  structure 
  of 
  the 
  

   type 
  locality, 
  it 
  is 
  impossible 
  to 
  say 
  whether 
  this 
  seems 
  to 
  be 
  due 
  to 
  

   complete 
  isolation 
  or 
  not. 
  

  

  