﻿BOLBOCERATESn 
  OF 
  THE 
  UNITED 
  STATES 
  — 
  CARTWRIGHT 
  107 
  

  

  Broadly 
  rounded 
  labrum 
  twice 
  as 
  wide 
  as 
  long. 
  Upper 
  surface 
  of 
  

   mandibles 
  concave, 
  sides 
  straight, 
  bent 
  at 
  right 
  angles 
  in 
  front, 
  

  

  Pronotum 
  retuse 
  in 
  front; 
  the 
  deeper 
  lateral 
  impressions 
  extending 
  

   upward 
  on 
  each 
  side 
  of 
  the 
  median 
  prominence 
  and 
  bounded 
  laterally 
  

   by 
  two 
  carinae 
  on 
  each 
  side; 
  the 
  lower 
  external 
  carina 
  starting 
  near 
  

   the 
  serrate 
  lateral 
  thoracic 
  margin 
  and 
  extending 
  upward 
  parallel 
  

   with 
  the 
  basal 
  thoracic 
  margin 
  for 
  a 
  distance 
  equal 
  to 
  half 
  the 
  length 
  

   of 
  the 
  lateral 
  margin; 
  the 
  upper 
  carina 
  starting 
  inside 
  the 
  upper 
  end 
  

   of 
  the 
  lower 
  and 
  extending 
  upward 
  for 
  a 
  slightly 
  shorter 
  distance; 
  

   viewed 
  from 
  the 
  side 
  the 
  lower 
  carina 
  is 
  nearly 
  straight, 
  the 
  upper 
  

   end 
  with 
  a 
  gentle 
  downward 
  curve, 
  the 
  lower 
  end 
  with 
  a 
  noticeable 
  

   but 
  low 
  toothlike 
  elevation; 
  in 
  outline 
  the 
  upper 
  carina 
  is 
  half 
  as 
  

   high 
  as 
  long, 
  sloping 
  upward 
  from 
  a 
  sharp 
  basal 
  curve 
  to 
  a 
  rounded 
  

   right-angled 
  peak, 
  then 
  down 
  on 
  a 
  concave 
  curve 
  to 
  a 
  noticeable 
  sec- 
  

   ondary 
  angle. 
  The 
  median 
  pronotal 
  prominence 
  sharply 
  declivous 
  in 
  

   front, 
  upper 
  surface 
  divided 
  by 
  an 
  anteriorly 
  increasingly 
  depressed 
  

   median 
  line, 
  the 
  parallel 
  sides 
  with 
  sharply 
  rounded 
  edges 
  anteriorly; 
  

   retuse 
  front 
  impunctate 
  except 
  for 
  a 
  subapical 
  line 
  of 
  close, 
  weak-to- 
  

   obsolete 
  punctures; 
  median 
  prominence 
  with 
  fine, 
  close 
  punctures 
  

   shading 
  to 
  minute 
  punctation 
  across 
  base; 
  a 
  few 
  obsolete 
  moderate 
  

   punctures 
  in 
  the 
  shallow 
  lateral 
  depressions 
  outside 
  the 
  carinae; 
  basal 
  

   bead 
  distinct. 
  Lateral 
  edges 
  strongly 
  serrate, 
  as 
  in 
  Bolbocerastes 
  

   serratus 
  (LeConte). 
  

  

  Elytra 
  not 
  strongly 
  shining; 
  striae 
  scarcely 
  impressed; 
  strial 
  

   punctures 
  fine, 
  moderately 
  close, 
  intervals 
  practically 
  flat, 
  very 
  

   minutely 
  punctulate. 
  

  

  Metasternal 
  lobe 
  separating 
  middle 
  coxae 
  half 
  as 
  wide 
  as 
  plate 
  

   behind 
  the 
  coxae. 
  

  

  Female 
  allotype, 
  length 
  21 
  mm., 
  width 
  10 
  mm. 
  Similar 
  to 
  the 
  male 
  

   except 
  that 
  the 
  thoracic 
  prominences 
  are 
  much 
  less 
  developed 
  and 
  

   the 
  head 
  is 
  different. 
  The 
  vertical 
  face 
  of 
  the 
  clypeus 
  is 
  only 
  half 
  as 
  

   high 
  as 
  the 
  basal 
  length, 
  the 
  upper 
  edge 
  less 
  than 
  half 
  the 
  basal 
  length, 
  

   and 
  from 
  each 
  end 
  a 
  curving 
  carina 
  extends 
  outward 
  to 
  top 
  of 
  the 
  

   secondary 
  horn 
  or 
  tubercle; 
  from 
  the 
  flattened 
  area 
  back 
  of 
  and 
  about 
  

   twice 
  as 
  high 
  as 
  the 
  secondary 
  tubercles 
  arises 
  a 
  widely 
  truncate 
  

   median 
  horn; 
  anterior 
  to 
  this 
  median 
  horn 
  the 
  surface 
  is 
  reticulate- 
  

   scabrous, 
  posteriorly 
  it 
  is 
  smooth. 
  

  

  7V2)e.— 
  Holotype 
  male, 
  USNM 
  61076. 
  

  

  Type 
  locality. 
  — 
  The 
  holotype 
  bears 
  the 
  following 
  label 
  data: 
  "3206. 
  

   Colo. 
  R. 
  bottom. 
  Monument 
  204. 
  Mex. 
  Bd. 
  line 
  Mar. 
  20-31, 
  '94. 
  

   USNM 
  Ace. 
  No. 
  28133 
  Dr. 
  E. 
  A. 
  Mearns." 
  Monument 
  204 
  is 
  approx- 
  

   imately 
  20 
  miles 
  south 
  of 
  Yuma, 
  Ariz., 
  near 
  San 
  Luis, 
  Mexico, 
  its 
  

   exact 
  location 
  being 
  lat. 
  32° 
  29' 
  03.59", 
  long. 
  114° 
  46' 
  44.79". 
  

  

  