﻿BOLBOCERATIlSn 
  OF 
  THE 
  UNITED 
  STATES 
  — 
  CARTWRIGHT 
  97 
  

  

  4. 
  Elytra 
  with 
  5 
  discal 
  striae 
  Eucanthus 
  

  

  Elytra 
  with 
  7 
  discal 
  striae 
  Bolbelasmus 
  

  

  5. 
  Base 
  of 
  elytia 
  margined, 
  metasternal 
  plate 
  pyriform 
  in 
  outline, 
  pronotum 
  

  

  without 
  postapical 
  carina, 
  first 
  elytral 
  stria 
  interrupted 
  by 
  scutellum 
  6 
  

  

  Base 
  of 
  elytra 
  not 
  margined, 
  metasternal 
  plate 
  rhomboid 
  in 
  outline, 
  pronotum 
  

   with 
  postapical 
  carina, 
  first 
  two 
  elytral 
  striae 
  interrupted 
  by 
  scutellum. 
  

  

  Bolborhombus, 
  new 
  genus 
  

  

  6. 
  Apex 
  of 
  tibia 
  of 
  middle 
  and 
  hind 
  legs 
  deeply 
  emarginate 
  on 
  outer 
  side, 
  the 
  

  

  angle 
  adjacent 
  to 
  spurs 
  appearing 
  almost 
  as 
  a 
  fixed 
  spur; 
  without 
  prosternal 
  

  

  spine 
  Bradycinetulus 
  

  

  Apex 
  of 
  tibia 
  of 
  middle 
  and 
  hind 
  legs 
  obliquely 
  truncate; 
  prosternal 
  spine 
  

   behind 
  anterior 
  coxae 
  transverse, 
  doubly 
  pointed, 
  and 
  remote 
  from 
  acutely 
  

   angled 
  intercoxal 
  piece 
  Bolbocerastes, 
  new 
  genus 
  

  

  Genus 
  Bolbelasmus 
  Boucotnont, 
  1911 
  

  

  Bolbelasmus 
  Boucomont, 
  Ann. 
  Soc. 
  Ent. 
  France, 
  vol. 
  79 
  (1910), 
  p. 
  335, 
  1911. 
  

   Kolbeus 
  Boucomont, 
  Ann. 
  Soc. 
  Ent. 
  France, 
  vol. 
  79 
  (1910), 
  p. 
  335, 
  1911. 
  — 
  Chapin, 
  

   Proc. 
  Biol. 
  Soc. 
  Washington, 
  vol. 
  59, 
  p. 
  79, 
  1946. 
  

  

  Chapin, 
  1946, 
  placed 
  Bradycinetus 
  hornii 
  Rivers 
  and 
  B. 
  minor 
  

   Linell 
  in 
  the 
  genus 
  Kolbeus, 
  basing 
  his 
  action 
  on 
  their 
  close 
  relation- 
  

   ship 
  to 
  Kolbeus 
  arcuatus 
  (Bates). 
  Examination 
  of 
  specimens 
  of 
  these 
  

   species 
  in 
  comparison 
  with 
  Bolbelasmus 
  gallicus 
  (Miilsant) 
  and 
  B. 
  

   unicorne 
  (Shrank), 
  and 
  in 
  the 
  light 
  of 
  Boucomont's 
  key 
  to 
  the 
  genera, 
  

   places 
  B. 
  minor 
  Linell 
  and 
  B. 
  hornii 
  Rivers 
  in 
  Bolbelasmus 
  rather 
  

   than 
  in 
  Kolbeus. 
  

  

  The 
  genus 
  Kolbeus 
  was 
  erected 
  without 
  a 
  genotype 
  by 
  Boucomont, 
  

   1911, 
  for 
  the 
  species 
  Bolboceras 
  arcuatus 
  Bates 
  and 
  B. 
  coreanus 
  Kolbe. 
  

   Lucas, 
  1920 
  (Catalogus 
  . 
  . 
  . 
  Coleopterorum, 
  p. 
  356), 
  selected 
  

   B. 
  coreanus 
  Kolbe, 
  a 
  species 
  found 
  in 
  Korea 
  and 
  China, 
  as 
  the 
  

   genotype. 
  The 
  species 
  B. 
  arcuatus 
  Bates 
  almost 
  exactly 
  duplicates 
  

   Bolbelasmus 
  minor 
  (Linell) 
  except 
  for 
  the 
  slightly 
  narrower 
  scutellum 
  

   and 
  lack 
  of 
  a 
  marginal 
  line 
  over 
  the 
  middle 
  half 
  of 
  the 
  base 
  of 
  the 
  

   pronotum. 
  Since 
  a 
  direct 
  comparison 
  of 
  specimens 
  shows 
  such 
  minor 
  

   differences, 
  I 
  transfer 
  arcuatus 
  Bates 
  to 
  the 
  genus 
  Bolbelasmus. 
  

   Whether 
  the 
  genus 
  Kolbeus 
  should 
  be 
  synonymized 
  with 
  Bolbelasmus 
  

   will 
  depend 
  upon 
  an 
  examination 
  of 
  its 
  genotype, 
  a 
  species 
  not 
  avail- 
  

   able 
  for 
  study 
  at 
  present. 
  Further 
  basis 
  for 
  placing 
  arcuatus 
  in 
  Bol- 
  

   belasmus 
  is 
  found 
  in 
  similarity 
  of 
  the 
  aedeagi 
  (see 
  fig. 
  14). 
  

  

  Genotype. 
  — 
  Scarabaeus 
  gallicus 
  Mulsant, 
  Histoire 
  naturelle 
  des 
  

   Coleopteres 
  de 
  France, 
  Lamellicornes, 
  p. 
  350, 
  1842. 
  (Present 
  desig- 
  

   nation.) 
  

  

  Key 
  to 
  the 
  species 
  of 
  Bolbelasmus 
  

  

  1. 
  Base 
  of 
  pronotum 
  not 
  margined 
  over 
  middle 
  half; 
  length 
  7 
  to 
  9 
  mm. 
  (Cali- 
  

   fornia, 
  Mexico) 
  arcuatus 
  (Bates) 
  

  

  Base 
  of 
  pronotum 
  completely 
  margined 
  ,-.,. 
  2 
  

  

  