﻿98 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.103 
  

  

  2. 
  Ely 
  tral 
  striae 
  coarsely, 
  deeply 
  punctate 
  as 
  in 
  Eucanthus; 
  genae 
  obtusely 
  roundfed 
  ; 
  

   surface 
  of 
  head 
  and 
  clypeus 
  similarly 
  densely, 
  coarsely 
  punctate 
  in 
  male; 
  

   frontal 
  carina 
  weakly 
  tri-tuberculate 
  in 
  female; 
  length 
  7 
  to 
  10 
  mm. 
  (Texas). 
  

  

  minor 
  (Linell) 
  

  

  Ely 
  tral 
  striae 
  finely 
  to 
  moderately 
  punctate; 
  genae 
  angulate 
  externally; 
  

  

  surface 
  of 
  clypeus 
  roughly, 
  densely, 
  coarsely 
  punctate, 
  remaining 
  surface 
  of 
  

  

  head 
  much 
  smoother 
  and 
  more 
  finely 
  punctate 
  in 
  the 
  male; 
  frontal 
  carina 
  

  

  not 
  trinodose 
  in 
  female; 
  length 
  14 
  mm. 
  (California) 
  hornii 
  (Rivers) 
  

  

  Bolbelasmus 
  arcuatus 
  (Bates), 
  new 
  combination 
  

  

  Figure 
  14, 
  I 
  

  

  Bolboceras 
  arcuatus 
  Bates, 
  Biologia 
  Centrali-Amerlcana, 
  Coleoptera, 
  vol. 
  2, 
  pt. 
  2, 
  

  

  p. 
  Ill, 
  1887. 
  

   Kolbeus 
  arcuatus 
  Boucomont, 
  Ann. 
  Soc. 
  Ent. 
  France, 
  vol. 
  79 
  (1910), 
  p. 
  336, 
  1911. 
  — 
  

  

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

  

  Bolbelasmus 
  arcuatus 
  (Bates) 
  is 
  a 
  small, 
  dark 
  red-brown, 
  shining 
  

   species, 
  7 
  to 
  9 
  mm. 
  in 
  length, 
  readily 
  recognized 
  through 
  the 
  lack 
  of 
  

   basal 
  margins 
  on 
  both 
  pronotum 
  and 
  elytra. 
  The 
  labrum 
  is 
  wddely, 
  

   shallowly 
  emarginate 
  in 
  front; 
  the 
  clypeus 
  is 
  almost 
  evenly 
  arcuate 
  

   from 
  side 
  to 
  side; 
  the 
  clypeal 
  suture 
  is 
  distmct; 
  the 
  anterior 
  angles 
  of 
  

   the 
  pronotum 
  are 
  sharply 
  right 
  angled; 
  the 
  scutellum 
  is 
  elongate; 
  

   the 
  strial 
  punctures 
  are 
  coarse, 
  in 
  the 
  outside 
  row 
  at 
  the 
  apex 
  very 
  coarse 
  

   and 
  unusually 
  deep, 
  practically 
  perforating 
  the 
  elytra; 
  the 
  elytra 
  

   have 
  a 
  row 
  of 
  widely 
  spaced, 
  long, 
  bristlelike 
  hairs 
  near 
  the 
  margin; 
  

   the 
  male 
  has 
  a 
  single 
  median 
  conical 
  cephalic 
  horn 
  and 
  a 
  low, 
  wide, 
  

   median 
  thoracic 
  prominence 
  and 
  anterior 
  shallow 
  depression 
  on 
  each 
  

   side; 
  the 
  female 
  has 
  a 
  wide, 
  more-or-less 
  tri-tuberculate 
  carina 
  on 
  the 
  

   head 
  and 
  a 
  simple, 
  fine, 
  sharp, 
  transverse 
  carina 
  on 
  the 
  pronotum. 
  

  

  Type. 
  — 
  Type 
  probably 
  among 
  the 
  Biologia 
  specimens 
  in 
  the 
  British 
  

   Museum 
  (Natural 
  History). 
  

  

  Type 
  locality. 
  — 
  Not 
  designated 
  among 
  the 
  localities 
  originally 
  listed, 
  

   "Mexico, 
  Cordova, 
  Toxpan, 
  Playa 
  Vicente 
  (Salle), 
  Colima 
  City 
  

   (Hoge); 
  Nicaragua, 
  Chontales 
  (Belt, 
  Janson)." 
  

  

  Specimens 
  examined. 
  — 
  19, 
  

  

  Distribution. 
  — 
  Costa 
  Rica: 
  Tilaran 
  (Guanacaste), 
  San 
  Pedro 
  de 
  

   Montes 
  de 
  Oca, 
  San 
  Jose, 
  and 
  *Dominical. 
  Guatemala. 
  Mexico: 
  

   Colima, 
  El 
  Sabino, 
  Compostela, 
  MazatMn, 
  Monterey, 
  *Monclova, 
  

   and 
  *Guadalajara. 
  United 
  States: 
  a 
  single 
  specimen 
  labeled 
  "Los 
  

   Angeles, 
  California, 
  H. 
  Klages 
  Coll.," 
  in 
  the 
  Carnegie 
  Museum, 
  

   Pittsburgh, 
  Pa. 
  

  

  Figure 
  14. 
  — 
  Ventral 
  and 
  lateral 
  views 
  of 
  the 
  aedeagi 
  of 
  Bradycinetulus 
  and 
  closely 
  related 
  

   species: 
  a-c, 
  Species 
  of 
  Bolborhombus: 
  a, 
  parvulus, 
  new 
  species; 
  b, 
  angulus 
  (Robinson); 
  

   c, 
  schaefferi 
  (Boucomont). 
  d-g, 
  Species 
  of 
  Bolbocerastes: 
  d, 
  peninsularis 
  (Schaeffer); 
  e, 
  

   regalis, 
  new 
  species;! 
  f, 
  serratus 
  (LeConte); 
  g, 
  imperialis, 
  new 
  species, 
  h-j. 
  Species 
  of 
  

   Bradycinetulus: 
  h, 
  ferrugineus 
  (Palisot 
  de 
  Beauvois); 
  i, 
  rex, 
  new 
  species; 
  j, 
  fossatus 
  

   (Haldeman). 
  k-n, 
  Species 
  of 
  Bolbelasmus: 
  k, 
  gallicus 
  (Mulsant); 
  /, 
  arcuatus 
  (Bates); 
  

   m, 
  hornii 
  (Rivers); 
  n, 
  minor 
  (Linell). 
  

  

  