﻿404 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  JVIUSEUM 
  vol.98 
  

  

  Holotype.— 
  Adult 
  male, 
  skin 
  and 
  skull, 
  A.M.N.H. 
  No. 
  32664; 
  col- 
  

   lected 
  July 
  20, 
  1911, 
  by 
  M. 
  A. 
  Carriker, 
  Jr. 
  

  

  Type 
  locality. 
  — 
  Hacienda 
  Cincinnati 
  (formerly 
  known 
  as 
  Val- 
  

   paraiso), 
  northeast 
  of 
  Santa 
  Marta, 
  on 
  northwestern 
  slope 
  of 
  the 
  

   Sierra 
  Nevada 
  de 
  Santa 
  Marta, 
  Magdalena, 
  Colombia; 
  altitude, 
  

   1,480 
  meters. 
  

  

  Distribution 
  (map, 
  fig. 
  58). 
  — 
  Canal 
  Zone 
  and 
  eastern 
  portion 
  of 
  

   Panamd; 
  in 
  Colombia, 
  departments 
  of 
  Magdalena, 
  Atlantico, 
  Bolivar, 
  

   northwestern 
  Antioquia, 
  and 
  Choc6. 
  

  

  Characters. 
  — 
  As 
  in 
  trivirgatus 
  but 
  median 
  dorsal 
  band 
  less 
  sharply 
  

   contrasted 
  with 
  sides 
  of 
  back; 
  distinguished 
  from 
  lemurinus, 
  by 
  more 
  

   uniformly 
  paler 
  coloration 
  throughout, 
  pelage 
  shorter, 
  the 
  guard 
  hairs 
  

   and 
  dark 
  tipping 
  of 
  cover 
  hairs 
  of 
  back 
  reduced. 
  

  

  Remarks. 
  — 
  In 
  general, 
  night 
  monkeys 
  of 
  the 
  coastal 
  plams 
  are 
  

   more 
  warmly 
  colored 
  throughout 
  than 
  those 
  of 
  higher 
  altitudes 
  in 
  

   the 
  Serrania 
  del 
  Darien 
  (Cana, 
  approximately 
  600 
  meters), 
  the 
  Sierra 
  

   Nevada 
  de 
  Santa 
  Marta 
  (Cincinnati, 
  1,400 
  meters) 
  and 
  the 
  Sierra 
  de 
  

   Perijd 
  (Sierra 
  Negra, 
  1,300 
  meters). 
  Apparently 
  specimens 
  from 
  

   these 
  montane 
  localities 
  have 
  developed 
  along 
  parallel 
  lines 
  and 
  

   become 
  grayer, 
  with 
  pelage 
  laxer. 
  In 
  no 
  case 
  is 
  any 
  of 
  these 
  popu- 
  

   lations 
  sufficiently 
  differentiated 
  from 
  its 
  lowlands 
  neighbors 
  to 
  war- 
  

   rant 
  subspecific 
  recognition 
  for 
  it. 
  Specimens 
  from 
  Canal 
  Zone, 
  

   Panamd 
  (zonalis), 
  are 
  in 
  brown 
  phase 
  with 
  upper 
  surface 
  of 
  hands 
  

   and 
  feet 
  blackish. 
  These 
  gradually 
  grade 
  into 
  paler, 
  grayer 
  forms, 
  

   in 
  the 
  upper 
  Rio 
  Tuyra 
  Basin, 
  on 
  one 
  hand, 
  but 
  continue 
  practically 
  

   unchanged 
  into 
  the 
  lowlands 
  of 
  the 
  Atrato, 
  Simi, 
  and 
  Magdalena, 
  on 
  

   the 
  other. 
  In 
  Colombian 
  localities, 
  however, 
  upper 
  surface 
  of 
  hands 
  

   and 
  feet 
  are 
  more 
  commonly 
  brown, 
  less 
  contrasted 
  with 
  forearm.s 
  

   and 
  forelegs. 
  Night 
  monkeys 
  of 
  the 
  Rio 
  Cesar 
  Valley 
  are 
  in 
  gray 
  

   phase 
  like 
  a 
  topotype 
  of 
  griseimembra 
  but 
  with 
  ischial 
  region 
  more 
  

   brightly 
  orange. 
  Three 
  specimens 
  from 
  Sierra 
  Negra, 
  Sierra 
  de 
  

   Perijd, 
  also 
  grayish, 
  differ 
  from 
  the 
  topotype 
  by 
  their 
  laxer 
  pelage, 
  

   paler 
  midventral 
  region 
  and 
  browner 
  terminal 
  portions 
  of 
  tails. 
  

  

  Subspecific 
  separation 
  of 
  northern 
  Colombian 
  and 
  Panamanian 
  

   griseimembra 
  from 
  typical 
  trivirgatus 
  is 
  maintained 
  pending 
  examina- 
  

   tion 
  of 
  material 
  from 
  intermediate 
  localities. 
  Gray 
  phase 
  individuals 
  

   of 
  griseimembra 
  from 
  Canal 
  Zone 
  (Alajuela) 
  and 
  from 
  the 
  Rio 
  Cesar, 
  

   Colombia, 
  are 
  almost 
  identical 
  with 
  a 
  near 
  topotype 
  of 
  trivirgatus 
  from 
  

   Puerto 
  Ayacucho, 
  Rio 
  Orinoco. 
  Similarly, 
  brown-phase 
  individuals 
  

   from 
  almost 
  anywhere 
  within 
  the 
  range 
  of 
  griseimembra 
  can 
  be 
  

   matched 
  with 
  brown-phase 
  topo 
  types 
  of 
  trivirgatus. 
  The 
  night 
  mon- 
  

   key 
  of 
  the 
  Azuero 
  Peninsula, 
  Panamd, 
  described 
  as 
  Aotus 
  bipunctatus 
  

   is 
  certainly 
  a 
  member 
  of 
  the 
  common 
  species 
  but 
  requires 
  further 
  

   comparison 
  with 
  additional 
  material 
  to 
  determine 
  its 
  exact 
  relation- 
  

  

  