﻿BOLBOCERATIISri 
  OF 
  THE 
  UNITED 
  STATES 
  — 
  CARTWRIGHT 
  119 
  

  

  Metasternal 
  plate 
  twice 
  as 
  wide 
  as 
  the 
  lobe 
  between 
  the 
  middle 
  

   coxae, 
  roughly 
  punctate, 
  and 
  hairy 
  along 
  posterior 
  edges, 
  Prosternal 
  

   spine 
  4-cornered, 
  with 
  the 
  anterior 
  angle 
  curving 
  do^vn 
  to 
  a 
  sharp 
  

   point 
  between 
  the 
  coxae 
  and 
  with 
  the 
  lateral 
  angles 
  on 
  a 
  transverse 
  

   level 
  and 
  the 
  posterior 
  curving 
  do^vnward 
  to 
  form 
  a 
  sharp 
  spine. 
  

  

  Allotype 
  female, 
  length 
  9 
  mm., 
  width 
  6 
  mm. 
  Apparently 
  identical 
  

   with 
  the 
  male 
  in 
  every 
  way 
  except 
  in 
  characters 
  of 
  the 
  head. 
  Clypeus 
  

   rising 
  steeply 
  at 
  somewhat 
  less 
  than 
  a 
  right 
  angle 
  to 
  a 
  sharply 
  carinate 
  

   edge 
  seven-eighths 
  as 
  wide 
  and 
  parallel 
  to 
  the 
  turned-under 
  anterior 
  

   margin; 
  the 
  flat 
  face 
  enclosed 
  being 
  a 
  little 
  less 
  than 
  one-third 
  as 
  high 
  

   as 
  long, 
  then 
  dropping 
  sharply 
  and 
  gradually 
  up 
  again 
  with 
  the 
  

   lateral 
  edges 
  slightly 
  diverging 
  to 
  the 
  top 
  of 
  the 
  very 
  wide 
  median 
  

   horn, 
  which 
  is 
  widely 
  and 
  deeply 
  emarginate 
  at 
  middle, 
  leaving 
  the 
  

   two 
  ends, 
  or 
  external 
  angles, 
  as 
  rounded, 
  thickened, 
  backward-sloping 
  

   prominences; 
  back 
  of 
  the 
  emargination, 
  on 
  the 
  same 
  level, 
  and 
  at 
  a 
  

   point 
  midway 
  between 
  the 
  ocular 
  canthi, 
  is 
  a 
  very 
  short 
  arcuate 
  

   carina 
  or 
  elongate 
  tubercle, 
  behind 
  which 
  the 
  general 
  level 
  of 
  the 
  head 
  

   is 
  noticeably 
  lower; 
  surface 
  in 
  front 
  of 
  the 
  horn 
  deeply, 
  coarsely 
  

   punctate-reticulate, 
  between 
  the 
  horn 
  and 
  the 
  tubercle 
  roughly 
  

   coarsely 
  punctate, 
  and 
  behind 
  the 
  tubercle 
  much 
  smoother, 
  with 
  

   dispersed, 
  mixed 
  fine 
  and 
  shallow, 
  coarse 
  punctures; 
  occiput 
  smooth, 
  

   practically 
  impunctate. 
  

  

  Type.' 
  — 
  In 
  California 
  Academy 
  of 
  Sciences 
  collection. 
  

  

  Type 
  locality.- 
  — 
  Triunfo, 
  Baja 
  California, 
  Mexico. 
  Holotype 
  male 
  

   collected 
  Aug. 
  7, 
  1938, 
  Michelbacher 
  and 
  Koss. 
  

  

  Allotype 
  and 
  paratypes. 
  — 
  Allotype 
  female, 
  CAS, 
  and 
  paratype 
  male, 
  

   USNM 
  61656, 
  San 
  Venancio, 
  Baja 
  California, 
  Mexico, 
  Oct. 
  8, 
  1941, 
  

   Ross 
  and 
  Bohart; 
  paratype 
  female, 
  USNM 
  61656, 
  Santa 
  Rosa, 
  Baja 
  

   California, 
  Mexico, 
  Charles 
  Schaeffer 
  collection. 
  

  

  Remarks.- 
  — 
  Bolborhombus 
  parvulus 
  is 
  very 
  near 
  B. 
  angulus 
  (Robin- 
  

   son) 
  and 
  is 
  about 
  the 
  same 
  size. 
  The 
  four 
  specimens 
  vary 
  in 
  length 
  

   from 
  8)^ 
  mm. 
  for 
  the 
  smaller 
  male 
  to 
  lOji 
  mm. 
  for 
  the 
  larger 
  female. 
  

   The 
  anterior 
  edge 
  of 
  the 
  clypeus, 
  described 
  as 
  margined 
  in 
  angulus, 
  is 
  

   almost 
  exactly 
  the 
  same 
  as 
  in 
  the 
  female 
  of 
  parvulus. 
  

  

  Bolborhombus 
  schaefferi 
  (Boucomont), 
  new 
  combination 
  

  

  Figure 
  14, 
  c 
  

  

  Bradycinetus 
  carinatus 
  Schaeffer, 
  Trans. 
  Amer. 
  Ent. 
  Soc, 
  vol. 
  32, 
  p. 
  251, 
  1906. 
  

   Bolboceras 
  schaefferi 
  Boucomont, 
  Ann. 
  Soc. 
  Ent. 
  France, 
  vol. 
  79, 
  p. 
  347, 
  1910. 
  

  

  Bolborhombus 
  schaeferi 
  (Boucomont) 
  averages 
  much 
  larger 
  than 
  

   B. 
  parvulus 
  and 
  B. 
  angulus, 
  measuring 
  11 
  to 
  18 
  mm. 
  in 
  length, 
  but 
  it 
  

   is 
  very 
  similar 
  in 
  all 
  characters 
  except 
  those 
  of 
  the 
  head, 
  clypeus, 
  and 
  

   aedeagus. 
  Males 
  show 
  considerable^variation 
  in 
  the 
  clypeal 
  horn. 
  

  

  