﻿106 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  los 
  

  

  3. 
  Lateral 
  serrations 
  of 
  pronotum 
  arising 
  between 
  the 
  two 
  edges 
  of 
  a 
  doubly 
  

  

  carinate 
  margin; 
  elytral 
  striae 
  moderately 
  impressed, 
  strial 
  punctures 
  dis- 
  

   tinct; 
  color 
  reddish 
  brown, 
  usually 
  quite 
  strongly 
  shining; 
  tip 
  of 
  clypeal 
  

   horn 
  rounded 
  in 
  male, 
  inner 
  thoracic 
  carina 
  without 
  secondary 
  angle 
  at 
  

   upper 
  end; 
  female 
  cephahc 
  horn 
  rarely 
  higher 
  than 
  clypeal 
  horn, 
  carina 
  

   extending 
  back 
  from 
  clypeal 
  horn 
  on 
  each 
  side 
  sharp, 
  strong, 
  usually 
  dark 
  

   colored, 
  lateral 
  secondary 
  horns 
  nearer 
  midway 
  between 
  clypeal 
  and 
  cephalic 
  

   horns 
  than 
  to 
  the 
  cephalic 
  horn, 
  discal 
  area 
  of 
  head 
  distinctly 
  punctate 
  

   throughout, 
  fine 
  punctures 
  of 
  median 
  thoracic 
  prominence 
  distinct 
  and 
  

   noticeable 
  (Kansas, 
  Oklahoma, 
  Texas, 
  New 
  Mexico). 
  serratus 
  (LeConte) 
  

   Pronotum 
  without 
  or 
  with 
  only 
  traces 
  of 
  a 
  doubly 
  carinate 
  margin 
  laterally, 
  

   the 
  serrations 
  appearing 
  as 
  thickenings 
  of 
  a 
  single 
  sharp 
  edge; 
  well 
  developed 
  

   males 
  with 
  a 
  secondary 
  angle 
  at 
  upper 
  end 
  of 
  inner 
  thoracic 
  carina 
  — 
  4 
  

  

  4. 
  Elytral 
  striae 
  much 
  less 
  distinct, 
  the 
  elytra 
  smoother 
  in 
  appearance, 
  nearly 
  

  

  as 
  in 
  peninsularis 
  , 
  color 
  lighter, 
  more 
  yellow-brown, 
  less 
  strongly 
  shining; 
  

   fully 
  developed 
  male 
  with 
  tip 
  of 
  clypeal 
  horn 
  narrowly 
  truncate 
  and 
  well 
  

   forward 
  from 
  the 
  lateral 
  horns, 
  upper 
  lateral 
  thoracic 
  carina 
  of 
  the 
  male 
  

   frequently 
  with 
  a 
  noticeable 
  secondary 
  angle 
  at 
  upper 
  end; 
  female 
  median 
  

   cephalic 
  horn 
  often 
  very 
  high, 
  usually 
  higher 
  than 
  clypeal 
  horn, 
  carina 
  

   extending 
  back 
  to 
  lateral 
  secondary 
  horn 
  weak, 
  sometimes 
  obhterated, 
  not 
  

   darker 
  in 
  color, 
  the 
  lateral 
  secondary 
  horns 
  weak, 
  usually 
  much 
  farther 
  

   back, 
  more 
  nearly 
  in 
  line 
  with 
  the 
  cephalic 
  horn, 
  discal 
  area 
  of 
  head 
  usually 
  

   with 
  only 
  scattered 
  punctures 
  behind 
  median 
  horn 
  (Baja 
  California, 
  Cali- 
  

   fornia, 
  Arizona, 
  western 
  Texas) 
  imperialis, 
  new 
  species 
  

  

  Elytral 
  striae 
  deeper, 
  color 
  red-brown, 
  more 
  strongly 
  shining 
  as 
  in 
  serratus, 
  

   otherwise 
  as 
  above 
  (Kansas) 
  imperialis 
  kansanus, 
  new 
  subspecies 
  

  

  Bolbocerastes 
  regalis, 
  new 
  species 
  

  

  Figure 
  14, 
  e; 
  Plate 
  4 
  

  

  Holotype 
  male, 
  length 
  18 
  mm., 
  width 
  11.5 
  mm. 
  In 
  general 
  appear- 
  

   ance 
  closely 
  similar 
  to 
  Bolbocerastes 
  serratus 
  (LeConte), 
  ferrugineus, 
  

   shining, 
  densely 
  hairy 
  beneath. 
  Clypeus 
  perpendicular 
  in 
  front, 
  the 
  

   flat 
  vertical 
  face 
  extending 
  upward 
  to 
  form 
  a 
  broad 
  truncate 
  horn, 
  

   the 
  vertical 
  height 
  subequal 
  to 
  base, 
  the 
  lateral 
  edges 
  arcuate 
  from 
  

   base 
  to 
  upper 
  edge, 
  narrowing 
  at 
  basal 
  third 
  to 
  half 
  the 
  basal 
  width 
  

   then 
  expanding 
  to 
  three-fourths, 
  the 
  upper 
  edge 
  weakly 
  emarginate 
  

   and 
  subparallel 
  with 
  base, 
  shining 
  black 
  in 
  color, 
  rounded 
  and 
  knoblike 
  

   at 
  each 
  end; 
  the 
  sharply 
  defined 
  lateral 
  triangular 
  faces 
  of 
  the 
  horn 
  

   concave 
  and 
  posteriorly 
  elevated 
  from 
  base 
  into 
  secondary 
  horns 
  half 
  

   as 
  high; 
  posteriorly 
  the 
  broad 
  curving 
  slope 
  of 
  the 
  clypeal 
  horn 
  merges 
  

   into 
  the 
  flattened 
  upper 
  surface 
  of 
  the 
  head, 
  this 
  quadrangular 
  surface 
  

   with 
  a 
  secondary 
  horn 
  at 
  each 
  anterior 
  angle 
  and 
  with 
  sharply 
  defined 
  

   carinalike 
  subparallel 
  lateral 
  margins 
  from 
  which 
  the 
  prominent, 
  

   widely 
  explanate 
  eye 
  canthus 
  slopes 
  downward 
  and 
  outward. 
  Occip- 
  

   ital 
  area 
  smooth; 
  gradually, 
  finely, 
  closely, 
  shallowly 
  punctate 
  

   anteriorly; 
  anterior 
  and 
  lateral 
  faces 
  of 
  clypeal 
  horn, 
  labrum, 
  eye 
  

   canthi, 
  and 
  upper 
  surface 
  of 
  mandibles 
  finely 
  reticulate-scabrous. 
  

  

  