﻿324 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  « 
  

  

  abbreviations 
  represent 
  the 
  institutions 
  whose 
  collections 
  of 
  monkeys 
  

   were 
  examined: 
  

  

  A.M.N.H. 
  = 
  American 
  Museum 
  of 
  Natural 
  History, 
  New 
  York, 
  

  

  B.M. 
  = 
  British 
  Museum 
  (Natural 
  History), 
  London. 
  

  

  CM. 
  = 
  Carnegie 
  Museum, 
  Pittsburgh. 
  

  

  C.N.H.M. 
  = 
  Chicago 
  Natural 
  History 
  Museum. 
  

  

  M.C.Z. 
  = 
  Museum 
  of 
  Comparative 
  Zoology, 
  Cambridge. 
  

  

  M.N.H.N. 
  = 
  Museum 
  National 
  d'Histoire 
  Naturelle, 
  Paris. 
  

  

  U.S.N. 
  M. 
  = 
  United 
  States 
  National 
  Museum, 
  Washington. 
  

  

  GENUS 
  CEBUS 
  ERXLEBEN: 
  MICOS 
  AND 
  MACHINES 
  

  

  The 
  66 
  micos 
  collected 
  in 
  northern 
  Colombia 
  are 
  referable 
  to 
  Cebus 
  

   albifrons. 
  No 
  other 
  species 
  of 
  the 
  genus 
  occurs 
  in 
  the 
  area. 
  Other 
  

   species 
  of 
  Cebus 
  fomid 
  elsewhere 
  in 
  Colombia 
  are 
  C. 
  capucinus, 
  C. 
  

   nigrivittatus, 
  and 
  C. 
  apella. 
  The 
  last 
  species 
  mentioned 
  represents 
  a 
  

   section 
  of 
  the 
  genus 
  hereinafter 
  referred 
  to 
  as 
  "tufted." 
  The 
  others 
  

   compose 
  the 
  "untufted" 
  section. 
  

  

  Before 
  listing 
  the 
  forms 
  collected, 
  it 
  is 
  necessary 
  to 
  characterize 
  

   each 
  of 
  the 
  representative 
  species 
  of 
  the 
  genus 
  Cebus 
  and 
  to 
  establish 
  

   the 
  bases 
  for 
  the 
  nomenclature 
  adopted 
  here. 
  The 
  more 
  recent 
  

   publications 
  on 
  the 
  subject, 
  being 
  those 
  currently 
  accepted 
  as 
  guides 
  

   to 
  characters 
  and 
  nomenclature 
  of 
  the 
  species 
  of 
  Cebus, 
  are 
  critically 
  

   reviewed. 
  The 
  status 
  of 
  each 
  of 
  the 
  names 
  correctly 
  or 
  incorrectly 
  

   applied 
  to 
  an 
  "untufted" 
  Cebus 
  is 
  examined. 
  The 
  status 
  of 
  each 
  of 
  

   the 
  named 
  forms 
  of 
  "tufted" 
  Cebus 
  will 
  be 
  dealt 
  with 
  in 
  a 
  report 
  

   being 
  prepared 
  by 
  Dr. 
  Remington 
  Kellogg. 
  

  

  CHARACTERS 
  AND 
  COMPARISONS 
  OF 
  "UNTUFTED" 
  AND 
  "TUFTED" 
  SPECIES 
  

  

  Attempts 
  to 
  separate 
  "tufted" 
  from 
  "un 
  tufted" 
  cebids 
  on 
  the 
  basis 
  

   of 
  cranial 
  characters 
  have 
  never 
  been 
  wholly 
  satisfactory. 
  Tate 
  

   (1939, 
  p. 
  210) 
  offered 
  a 
  table 
  of 
  comparative 
  differences 
  in 
  skulls 
  of 
  the 
  

   two 
  groups. 
  He 
  pointed 
  out, 
  however 
  (p. 
  209), 
  that 
  the 
  differences 
  

   are 
  relatively 
  small 
  and 
  that 
  characters 
  that 
  hold 
  for 
  one 
  sex 
  are 
  

   sometimes 
  invalid 
  for 
  the 
  other. 
  Certain 
  of 
  these 
  differences 
  have 
  

   been 
  found 
  to 
  have 
  a 
  qualified 
  and 
  relative 
  value 
  when 
  applied 
  to 
  

   present 
  material. 
  The 
  character 
  referring 
  to 
  the 
  sagittal 
  crest 
  appears 
  

   to 
  be 
  valid; 
  that 
  of 
  the 
  structure 
  of 
  the 
  mandible 
  holds 
  in 
  most 
  cases. 
  

   Characters 
  referring 
  to 
  the 
  relation 
  of 
  the 
  maxillomalar 
  suture 
  to 
  the 
  

   lower 
  margin 
  of 
  the 
  orbit, 
  and 
  to 
  the 
  dimensions 
  of 
  the 
  external 
  narial 
  

   opening, 
  lose 
  significance 
  in 
  present 
  examples. 
  The 
  character 
  of 
  

   width 
  of 
  pterygoid 
  fossa 
  as 
  given 
  by 
  Tate 
  is 
  too 
  relative. 
  Restated, 
  

   however, 
  that 
  character 
  forms 
  parts 
  of 
  a 
  more 
  complex 
  difference 
  

   between 
  the 
  two 
  groups 
  of 
  Cebus. 
  Cranial 
  characters 
  distinguishing 
  

   the 
  groups 
  are 
  given 
  in 
  the 
  following 
  tabulation. 
  

  

  