﻿112 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  i03 
  

  

  the 
  clypeal 
  horn 
  decreases 
  in 
  height 
  and 
  its 
  apex 
  becomes 
  narrow, 
  

   sometimes 
  rounded, 
  but 
  usually 
  evidently 
  truncate, 
  and 
  the 
  anterior 
  

   face 
  vertical 
  or 
  sloping 
  slightly 
  backward; 
  the 
  median 
  pronotal 
  promi- 
  

   nence 
  is 
  usually 
  not 
  constricted 
  or 
  narrowed 
  basally. 
  

  

  B. 
  imperialis 
  is 
  allied 
  to 
  B. 
  serratus 
  (LeConte), 
  B. 
  regalis 
  Cartwright, 
  

   and 
  to 
  B. 
  peninsularis 
  (Schaeffer), 
  which 
  I 
  believe 
  is 
  a 
  distinct 
  species. 
  

   Well-developed 
  males 
  of 
  B. 
  imperialis 
  are 
  separated 
  from 
  the 
  other 
  

   species 
  by 
  the 
  anterior 
  clypeal 
  horn 
  being 
  relatively 
  farther 
  forward 
  

   from 
  the 
  lateral 
  horns, 
  the 
  triangle 
  formed 
  by 
  the 
  tips 
  of 
  the 
  three 
  

   horns 
  approaching 
  an 
  equilateral 
  triangle 
  much 
  more 
  closely 
  than 
  in 
  

   the 
  other 
  species. 
  The 
  apex 
  of 
  the 
  clypeal 
  horn 
  is 
  much 
  narrower 
  

   than 
  in 
  B. 
  regalis, 
  and 
  usually 
  truncate 
  rather 
  than 
  rounded 
  as 
  in 
  

   serratus 
  and 
  peninsularis; 
  in 
  fully 
  developed 
  males 
  the 
  inner 
  lateral 
  

   carina 
  is 
  doubly 
  angulate 
  as 
  in 
  regalis 
  but 
  has 
  the 
  high 
  middle 
  peak 
  

   bent 
  inward, 
  while 
  in 
  specimens 
  of 
  serratus 
  and 
  peninsularis 
  this 
  carina 
  

   is 
  not 
  higher 
  or 
  angulate 
  at 
  middle. 
  The 
  color 
  of 
  serratus 
  and 
  penin- 
  

   sularis 
  is 
  dark 
  red-brown, 
  of 
  imperialis, 
  a 
  more 
  yellow 
  brown. 
  

  

  In 
  Bolbocerastes 
  peninsularis, 
  represented 
  by 
  13 
  specimens, 
  3 
  of 
  

   them 
  cotypes, 
  the 
  male 
  clypeal 
  horn 
  is 
  rounded 
  as 
  in 
  B. 
  serratus 
  but 
  is 
  

   much 
  farther 
  back 
  relative 
  to 
  the 
  lateral 
  horns, 
  which 
  are 
  nearly 
  as 
  

   high 
  as 
  the 
  clypeal 
  horn. 
  The 
  female 
  is 
  more 
  heavily 
  punctate, 
  as 
  in 
  

   serratus, 
  and 
  the 
  area 
  back 
  of 
  the 
  median 
  horn 
  is 
  much 
  more 
  noticeably 
  

   punctate 
  than 
  in 
  imperialis. 
  

  

  Bolbocerastes 
  imperialis 
  kansanus, 
  new 
  subspecies 
  

  

  Holotype 
  male, 
  length 
  17 
  mm., 
  width 
  11 
  mm. 
  Very 
  similar 
  to 
  B. 
  

   imperialis; 
  moderately 
  shining 
  ; 
  darker 
  in 
  color; 
  hairy 
  beneath. 
  Anterior 
  

   face 
  of 
  the 
  narrowly 
  truncate 
  clypeal 
  horn 
  vertical 
  ; 
  lateral 
  secondary 
  

   horns 
  more 
  prominent; 
  surface 
  back 
  of 
  the 
  clypeal 
  horn 
  with 
  a 
  notice- 
  

   able 
  swelling 
  on 
  each 
  side 
  and 
  diagonally 
  backward 
  from 
  the 
  posterior 
  

   ridges 
  of 
  the 
  horn 
  to 
  a 
  point 
  even 
  with 
  the 
  forward 
  edge 
  of 
  the 
  eye 
  

   canthus, 
  leaving 
  between 
  them 
  a 
  widening 
  depressed 
  area 
  which 
  

   merges 
  with 
  the 
  general 
  posterior 
  level 
  of 
  the 
  head; 
  surface 
  anterior 
  

   to 
  the 
  arcuate 
  ridge 
  between 
  the 
  eyes 
  more 
  concave 
  and 
  much 
  smoother 
  

   than 
  in 
  typical 
  imperialis 
  ; 
  occiput 
  smooth; 
  eye 
  canthus 
  with 
  a 
  swelling 
  

   diagonally 
  inward 
  from 
  outer 
  anterior 
  angle. 
  

  

  Pronotum 
  more 
  coarsely 
  punctate 
  throughout; 
  lateral 
  edges 
  of 
  the 
  

   median 
  prominence 
  more 
  nearly 
  cariniform 
  and 
  not 
  constricted 
  

   basally; 
  median 
  peak 
  of 
  upper 
  lateral 
  carina 
  not 
  bent 
  inward: 
  the 
  

   depression 
  back 
  of 
  the 
  anterior 
  angles 
  at 
  bottom 
  of 
  the 
  lateral 
  sinuses 
  

   deeper, 
  more 
  noticeable, 
  and 
  distinct; 
  serrations 
  of 
  the 
  lateral 
  margin 
  

   appearing 
  as 
  thickenings 
  of 
  a 
  single 
  sharp 
  edge; 
  otherwise 
  similar 
  to 
  

   typical 
  imperialis. 
  

  

  Elytral 
  striae 
  deeper, 
  nearly 
  as 
  in 
  B. 
  serratus 
  (LeConte) 
  ; 
  the 
  second 
  

   stria 
  basally 
  indistinct 
  over 
  twice 
  the 
  length 
  of 
  the 
  scutellum. 
  

  

  