﻿516 
  Mr. 
  0. 
  Thomas 
  on 
  

  

  zygomatic 
  breadth 
  22'6 
  ; 
  nasals 
  19'5 
  X 
  5'6 
  ; 
  interorbital 
  

   breadth 
  7*1 
  ; 
  palatal 
  length 
  23'3; 
  three 
  anterior 
  molariform 
  

   teeth 
  6"7. 
  

  

  An 
  older 
  skull 
  of 
  similar 
  length 
  attains 
  25 
  mm. 
  in 
  zygo- 
  

   matic 
  spread. 
  

  

  Bab. 
  Trinidad. 
  Type 
  from 
  Caparo. 
  

  

  Type. 
  Adult 
  male. 
  B.M. 
  no. 
  97. 
  6. 
  7. 
  24. 
  Collected 
  18th 
  

   January, 
  1897, 
  by 
  Dr. 
  Percy 
  Rendall. 
  

  

  The 
  Trinidad 
  Marmoset, 
  is 
  a 
  larger, 
  stronger-coloured 
  

   animal 
  than 
  its 
  neighbours 
  on 
  Grenada 
  and 
  Tobago 
  and 
  than 
  

   that 
  on 
  the 
  opposite 
  mainland 
  which 
  I 
  assign 
  to 
  M. 
  mitis, 
  

   Bangs. 
  The 
  true 
  M. 
  murina 
  of 
  Guiana 
  has 
  much 
  smaller 
  

   teeth. 
  M. 
  mitis 
  extends 
  along 
  the 
  mountainous 
  ranges 
  from 
  

   Santa 
  Marta 
  through 
  Merida 
  to 
  Cumana, 
  and 
  appears 
  to 
  

   extend 
  southwards 
  into 
  Colombia 
  and 
  Ecuador. 
  The 
  hairs 
  

   of 
  the 
  sides 
  of 
  its 
  belly 
  are 
  always 
  conspicuously 
  slaty 
  at 
  

   base, 
  in 
  contradistinction 
  to 
  the 
  following 
  form. 
  

  

  Marmosa 
  mitis 
  casta, 
  subsp. 
  n. 
  

  

  Size 
  and 
  other 
  characters 
  as 
  in 
  M. 
  mitis, 
  but 
  nearly 
  or 
  

   quite 
  the 
  whole 
  of 
  the 
  hairs 
  of 
  the 
  under 
  surface, 
  cream- 
  

   coloured 
  to 
  their 
  bases. 
  If 
  a 
  few 
  of 
  the 
  hairs 
  on 
  each 
  side 
  of 
  

   the 
  belly 
  have 
  slat}' 
  bases, 
  these 
  are 
  quite 
  hidden 
  by 
  the 
  

   long 
  cream-coloured 
  ends, 
  while 
  in 
  true 
  mitis 
  the 
  area 
  of 
  

   slaty-based 
  hairs 
  is 
  readily 
  perceptible. 
  

  

  Skull 
  as 
  in 
  mitis. 
  

  

  Dimensions 
  of 
  the 
  type 
  (measured 
  in 
  flesh) 
  : 
  — 
  

  

  Head 
  and 
  body 
  138 
  mm. 
  ; 
  tail 
  190 
  ; 
  hind 
  foot 
  22 
  ; 
  ear 
  27. 
  

  

  Skull 
  : 
  condylo-basal 
  length 
  37*2; 
  zygomatic 
  breadth 
  20*5; 
  

   three 
  anterior 
  molariform 
  teeth 
  6'4. 
  

  

  Hah. 
  San 
  Esteban, 
  Carabobo, 
  N. 
  Venezuela. 
  

  

  Type. 
  Adult 
  male. 
  Original 
  number 
  207. 
  Collected 
  6th 
  

   February, 
  1911, 
  by 
  Mr. 
  S. 
  M. 
  Klages. 
  Twelve 
  specimens 
  

   examined. 
  

  

  Marmosa 
  dorothea, 
  sp. 
  n. 
  

  

  General 
  appearance 
  about 
  as 
  in 
  M. 
  mitis 
  casta 
  ; 
  skull- 
  

   ridges 
  as 
  in 
  M. 
  impavida. 
  

  

  Colour 
  above 
  a 
  rather 
  pale 
  " 
  murina 
  "-colour, 
  paler 
  than 
  

   " 
  cinnamon 
  " 
  and 
  rather 
  more 
  suffused 
  with 
  " 
  russet." 
  

   Under 
  surface 
  wholly 
  " 
  cream-buff/' 
  the 
  hairs 
  light 
  to 
  their 
  

   roots 
  ; 
  line 
  of 
  demarcation 
  on 
  sides 
  well 
  marked. 
  Hands 
  and 
  

   feet 
  whitish. 
  Tail 
  grey, 
  the 
  end 
  gradually 
  becoming 
  white 
  

   or 
  whitish. 
  

  

  