﻿WEE\7LS 
  OF 
  THE 
  TRIBE 
  OPHRYASTINI 
  — 
  ^DAVIS 
  509 
  

  

  gray. 
  Tliis 
  species 
  also 
  tends 
  to 
  be 
  less 
  parnllel 
  in 
  form 
  than 
  E. 
  I'urius. 
  

   The 
  averag:e 
  size 
  is 
  somewhat 
  hirger 
  than 
  in 
  mrnM\ 
  

  

  Aleasuremenis 
  in 
  millimeters.— 
  Length 
  8.G 
  to 
  12.3, 
  averaging 
  about 
  

   10.5 
  

  

  Type 
  locality. 
  — 
  Western 
  border 
  of 
  the 
  Colorado 
  Desert, 
  Cahf. 
  

  

  I 
  have 
  tlie 
  following 
  records 
  of 
  capture 
  for 
  this 
  species: 
  Califounia, 
  

   Imperial 
  County 
  (J. 
  C. 
  Bridwell); 
  San 
  Diego 
  County; 
  Holtville 
  (A. 
  C. 
  

   Davis). 
  Arizona, 
  Palmer 
  (Hubbard 
  and 
  Schwarz). 
  

  

  IV. 
  SPECIOSUS 
  group 
  

  

  This 
  group 
  is 
  characterized 
  by 
  the 
  female 
  genital 
  tube 
  being 
  dorso- 
  

   ventrally 
  flattened, 
  robust, 
  and 
  more 
  or 
  less 
  wedge-shaped 
  as 
  viewed 
  

   from 
  above 
  or 
  below. 
  The 
  transverse 
  impression 
  between 
  the 
  head 
  

   and 
  rostrum 
  seems 
  to 
  be 
  rather 
  an 
  unstable 
  character 
  in 
  this 
  group 
  

  

  KEY 
  TO 
  SPECIES 
  OF 
  SPECIOSUS 
  GROUP 
  

  

  1. 
  Rostrum 
  continuous 
  with 
  the 
  front 
  2 
  

  

  Rostnun 
  separated 
  from 
  the 
  front 
  by 
  a 
  transverse 
  impression 
  6 
  

  

  2. 
  Disk 
  of 
  proMutum 
  finely 
  and 
  sparsely 
  punctate 
  3 
  

  

  Disk 
  of 
  pronotuni 
  more 
  coarsely 
  and 
  closely 
  punctate 
  4 
  

  

  3. 
  Color 
  chocolate 
  brown, 
  pronotum 
  and 
  elytra 
  vittate 
  with 
  white. 
  

  

  speciosus 
  (LeConte) 
  

   Color 
  white, 
  not 
  or 
  but 
  fecblj' 
  mottled 
  nivosus 
  Fall 
  

  

  4. 
  Larger 
  (10 
  to 
  17 
  mm.); 
  scales 
  predominantly 
  white; 
  fore 
  tibiae 
  denticulate__5 
  

   Smaller 
  (6 
  to 
  10.6 
  mm.); 
  scales 
  predominantly 
  gray 
  or 
  brown; 
  fore 
  tibiae 
  

  

  not 
  denticulate 
  sordidus 
  (LcConte) 
  

  

  5. 
  White, 
  not 
  or 
  but 
  feebly 
  mottled 
  nivosus 
  Fall 
  

  

  White, 
  heavily 
  mottled 
  with 
  ocellatc 
  plumbeous 
  spots 
  marmoratus 
  Fall 
  

  

  6. 
  Gray, 
  even 
  numbered 
  elytral 
  intervals 
  more 
  or 
  less 
  strongly 
  marked 
  with 
  

  

  black 
  or 
  darker 
  gray; 
  setae 
  small, 
  but 
  visible; 
  Texas. 
  

  

  siniulans 
  Van 
  Dyke 
  

  

  Gray, 
  usually 
  strongly, 
  irregularly 
  blotched 
  with 
  black; 
  setae 
  extremely 
  

  

  small 
  and 
  inconspicuous; 
  California, 
  Arizona, 
  Nevada, 
  and 
  Utah. 
  

  

  argentatuB 
  (LeConte) 
  

  

  EUPAGODEBES 
  SPECIOSUS 
  (UConte) 
  

   FlQURB 
  57 
  

  

  Ophryafitrs 
  gpeciosus 
  LeC'onte, 
  1853, 
  p. 
  444. 
  

  

  Elongate, 
  moderately 
  convex, 
  deep 
  chocolate 
  brown 
  with 
  two 
  

   blotchy 
  white 
  vittae 
  upon 
  the 
  pronotum 
  and 
  irrognlar 
  white 
  vittae 
  

   upon 
  the 
  even 
  numbered 
  elytral 
  intervals; 
  head 
  with 
  an 
  irregular 
  

   sf)rinkling 
  of 
  wiiite 
  scm1(>s. 
  ]{ostruni 
  long, 
  stout, 
  continuous 
  with 
  the 
  

   front, 
  trisulcate, 
  the 
  mo<lian 
  sulcus 
  narrow 
  niid 
  (h'cp. 
  I'he 
  ridges 
  

   between 
  the 
  sulci 
  arc 
  grcntly 
  (h'velopcd 
  imd 
  are 
  flat 
  dorsally, 
  giving 
  

   the 
  deep 
  lateral 
  sulci 
  the 
  a[)j)earance 
  of 
  being 
  upon 
  tlu; 
  sides 
  of 
  the 
  

   rostrum 
  and 
  converging 
  rather 
  aharjjly 
  towiir<l 
  the 
  the 
  base 
  dorsally; 
  

   setae 
  of 
  rostrum 
  small, 
  squamiform, 
  recumbent. 
  In 
  s(»mcsi)(>cimens 
  the 
  

   medi»in 
  sulcus 
  extends 
  up 
  onto 
  the 
  front 
  to 
  about 
  the 
  level 
  of 
  the 
  

   upper 
  edge 
  of 
  the 
  eyes. 
  I'rniioliiiii 
  usually 
  widest 
  before 
  the 
  middle. 
  

  

  