﻿26 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  anteriorly 
  and 
  the 
  nasal 
  opening 
  less 
  elongated. 
  Compared 
  with 
  that 
  

   of 
  A. 
  fusciceps 
  robustus 
  the 
  premaxillae 
  tend 
  to 
  be 
  more 
  produced 
  

   anteriorly 
  beyond 
  plane 
  of 
  canines 
  and 
  the 
  nasal 
  opening 
  more 
  elon- 
  

   gated. 
  

  

  Measurements. 
  — 
  Three 
  adult 
  males 
  from 
  K,io 
  Guaimaral, 
  Valledu- 
  

   par, 
  Magdalena, 
  Colombia, 
  respectively: 
  Total 
  length, 
  1,248, 
  1,238, 
  

   1,211 
  mm. 
  ; 
  tail 
  vertebrae, 
  750, 
  739, 
  741 
  ; 
  hind 
  foot, 
  177, 
  178, 
  172. 
  Three 
  

   adult 
  females 
  from 
  same 
  locality, 
  respectively: 
  Total 
  length, 
  1,330, 
  

   1,247, 
  1267; 
  tail 
  vertebrae, 
  856, 
  778, 
  809; 
  hind 
  foot, 
  185, 
  187, 
  187. 
  

   Skull: 
  Three 
  adult 
  males 
  already 
  mentioned, 
  respectively: 
  Greatest 
  

   length, 
  113.9, 
  114.4, 
  116.6; 
  orbital 
  width, 
  60, 
  65, 
  63.3; 
  postorbital 
  con- 
  

   striction, 
  50.9, 
  49.2, 
  49.4; 
  width 
  of 
  brain 
  case, 
  65.6, 
  59.7, 
  65.3; 
  zygomatic 
  

   breadth, 
  71.4, 
  728, 
  74.1 
  ; 
  maxillary 
  tooth 
  row, 
  30.3, 
  30.9, 
  33.3. 
  Three 
  

   adult 
  females 
  already 
  mentioned, 
  respectively 
  : 
  Greatest 
  length, 
  116.9, 
  

   109.9, 
  110.7; 
  orbital 
  width, 
  64.8, 
  59.9, 
  61.3; 
  postorbital 
  constriction, 
  

   50.3, 
  48.1, 
  49.2; 
  width 
  of 
  brain 
  case, 
  61.6, 
  60.7, 
  60.8; 
  zygomatic 
  breadth, 
  

   70.2, 
  69, 
  69 
  ; 
  maxillary 
  tooth 
  row, 
  32.2, 
  32.6, 
  29.2. 
  

  

  Remarhs. 
  — 
  Ateles 
  liybridus 
  was 
  based 
  on 
  specimens 
  presented 
  to 
  the 
  

   Paris 
  Museum 
  by 
  M. 
  Plee 
  in 
  1826. 
  They 
  were 
  collected 
  in 
  the 
  valley 
  of 
  

   the 
  Rio 
  Magdalena, 
  Colombia, 
  but 
  no 
  definite 
  locality 
  was 
  given. 
  It 
  

   is 
  now 
  known 
  to 
  be 
  a 
  well-marked 
  form 
  with 
  an 
  extensive 
  range, 
  and 
  

   for 
  precision 
  we 
  restrict 
  the 
  type 
  locality 
  to 
  La 
  Gloria, 
  on 
  the 
  Rio 
  

   Magdalena 
  in 
  the 
  southern 
  part 
  of 
  Magdalena 
  Department, 
  Colombia, 
  

   where 
  the 
  animal 
  appears 
  to 
  be 
  typical. 
  Ateles 
  albifrons 
  Gray 
  was 
  

   described 
  from 
  South 
  America 
  without 
  definite 
  locality. 
  According 
  to 
  

   Elliot 
  (A 
  review 
  of 
  the 
  Primates, 
  vol. 
  2, 
  p. 
  45, 
  June 
  15, 
  1913) 
  , 
  the 
  type 
  

   in 
  the 
  British 
  Museum 
  is 
  stated 
  on 
  the 
  ticket 
  to 
  be 
  from 
  Medellin, 
  

   Colombia. 
  That 
  important 
  town 
  was 
  for 
  many 
  years 
  a 
  headquarters 
  

   for 
  dealers 
  in 
  natural-history 
  specimens, 
  many 
  of 
  which 
  labeled 
  as 
  

   from 
  there 
  are 
  known 
  to 
  have 
  been 
  collected 
  elsewhere, 
  and 
  it 
  is 
  not 
  

   improbable 
  that 
  the 
  type 
  of 
  albifrons 
  may 
  have 
  been 
  taken 
  at 
  some 
  

   other 
  locality. 
  At 
  any 
  rate, 
  descriptions 
  of 
  the 
  type 
  agree 
  so 
  well 
  with 
  

   hyhridus 
  that 
  the 
  name 
  may 
  be 
  assumed 
  to 
  belong 
  in 
  synonymy 
  under 
  

   it. 
  

  

  Another 
  spider 
  monkey, 
  [^Ateles 
  helsehuthl 
  bininneus^ 
  was 
  described 
  

   by 
  Gray 
  (Catalogue 
  of 
  the 
  monkeys, 
  lemurs 
  and 
  fruit-eating 
  bats 
  in 
  

   the 
  collection 
  of 
  the 
  British 
  Museum, 
  p. 
  44, 
  1870) 
  as 
  the 
  fourth 
  color 
  

   variety 
  of 
  helzehuth. 
  The 
  original 
  description 
  of 
  this 
  specimen, 
  which 
  

   was 
  stated 
  to 
  have 
  come 
  from 
  Brazil, 
  is 
  as 
  follows 
  : 
  "Brown, 
  or 
  brown- 
  

   washed 
  grey; 
  cheek, 
  loins, 
  and 
  outside 
  of 
  the 
  thighs 
  whiter; 
  chest, 
  

   throat, 
  inside 
  of 
  limbs 
  pale 
  grey 
  ; 
  crown, 
  outside 
  of 
  limbs, 
  and 
  upper 
  

   surface 
  of 
  tail 
  darker 
  brown." 
  Philip 
  Hershkovitz 
  has 
  recently 
  exam- 
  

   ined 
  the 
  type 
  of 
  hrunneiis 
  at 
  our 
  request 
  and 
  writes 
  that 
  it 
  is 
  identical 
  

   with 
  hyhridus. 
  The 
  type 
  has 
  been 
  exhibited 
  as 
  a 
  mounted 
  specimen 
  

   and 
  is 
  considerably 
  faded. 
  

  

  In 
  cranial 
  characters 
  hyhridus 
  seems 
  to 
  be 
  identical 
  with 
  helzehuth., 
  

   and 
  the 
  similarity 
  in 
  color 
  pattern 
  strongly 
  indicates 
  that 
  the 
  two 
  are 
  

  

  