﻿new 
  Mammah 
  from 
  Tropical 
  South 
  America. 
  517 
  

  

  Skull 
  of 
  the 
  same 
  long 
  narrow 
  shape 
  as 
  in 
  M. 
  impavida, 
  

   Tsch., 
  and 
  the 
  supraorbital 
  edges 
  similarly 
  with 
  tine 
  narrow 
  

   headings 
  parallel 
  to 
  each 
  other, 
  not 
  thickened 
  as 
  in 
  all 
  the 
  

   previous 
  species, 
  and 
  not 
  projecting 
  laterally 
  over 
  the 
  orbits. 
  

   Teeth 
  decidedly 
  smaller 
  than 
  in 
  impavida. 
  

  

  Dimensions 
  of 
  the 
  type 
  (measured 
  in 
  skin) 
  : 
  — 
  

  

  Head 
  and 
  body 
  130 
  mm. 
  ; 
  tail 
  158; 
  hind 
  toot 
  18 
  ; 
  ear 
  25. 
  

  

  Skull: 
  greatest 
  length 
  35*4; 
  condylo-basal 
  length 
  34 
  - 
  2 
  ; 
  

   zygomatic 
  breadth 
  17'6 
  ; 
  nasals 
  16*8 
  x 
  4*3; 
  interorbital 
  

   breadth 
  6 
  ; 
  breadth 
  of 
  brain-case 
  12*8; 
  palate 
  length 
  194 
  ; 
  

   three 
  anterior 
  molariform 
  teeth 
  5"7. 
  

  

  Bab. 
  N.W. 
  Bolivia. 
  Type 
  from 
  Rio 
  Solocame, 
  G7° 
  W., 
  

   16° 
  S. 
  Alt. 
  2300 
  m. 
  Another 
  specimen 
  from 
  Mapiri. 
  

  

  Type. 
  Adult 
  female. 
  B.M. 
  no. 
  1. 
  6. 
  7. 
  79. 
  Original 
  

   number 
  1329. 
  Collected 
  26th 
  January, 
  1901, 
  by 
  Perry 
  O. 
  

   Simons. 
  Presented 
  by 
  Oldfield 
  Thomas. 
  

  

  Readily 
  distinguishable 
  from 
  its 
  nearest 
  ally, 
  the 
  M. 
  im- 
  

   pavida 
  of 
  Central 
  Peru, 
  with 
  which 
  it 
  shares 
  the 
  general 
  

   structure 
  of 
  the 
  skull, 
  by 
  its 
  wholly 
  light 
  belly 
  and 
  smaller 
  

   teeth. 
  

  

  Marmosa 
  parata, 
  sp. 
  n. 
  

  

  Allied 
  to 
  true 
  M. 
  murina, 
  but 
  teeth 
  not 
  so 
  small. 
  

  

  More 
  grey-brown 
  than 
  in 
  most 
  of 
  the 
  group 
  of 
  red 
  Mar- 
  

   mosas, 
  the 
  general 
  colour 
  above 
  similar 
  to, 
  but 
  considerably 
  

   darker 
  than, 
  " 
  wood-brown." 
  Under 
  surface 
  " 
  pinkish 
  

   buff," 
  the 
  hairs 
  of 
  the 
  belly 
  slaty 
  at 
  base 
  nearly 
  or 
  quite 
  to 
  

   the 
  middle 
  line. 
  Dark 
  orbital 
  patch 
  large, 
  extending 
  nearly 
  

   to 
  the 
  tip 
  of 
  the 
  nose. 
  Hands 
  and 
  feet 
  brownish 
  white. 
  

   Tail 
  grey-brown 
  to 
  the 
  tip. 
  

  

  Skull 
  with 
  broadly 
  expanded 
  zygomata. 
  Interorbital 
  

   region 
  with 
  angular 
  ledges 
  projecting 
  over 
  the 
  orbits. 
  Teeth 
  

   larger 
  than 
  in 
  true 
  M. 
  murina. 
  

  

  Dimensions 
  of 
  the 
  type 
  (measured 
  in 
  flesh) 
  : 
  — 
  

  

  Head 
  and 
  body 
  140 
  mm. 
  ; 
  tail 
  180 
  ; 
  hind 
  foot 
  18; 
  ear 
  24. 
  

  

  Skull 
  : 
  greatest 
  length 
  35*8 
  ; 
  condylo-basal 
  length 
  34*6 
  ; 
  

   zygomatic 
  breadth 
  20 
  ; 
  nasals 
  15'2 
  X 
  5"1 
  ; 
  interorbital 
  breadth 
  

   6*2 
  ; 
  breadth 
  across 
  postorbital 
  processes 
  7*7 
  ; 
  breadth 
  of 
  

   brain-case 
  13*7 
  ; 
  palatal 
  length 
  19*7; 
  three 
  anterior 
  molari- 
  

   form 
  teeth 
  5"8. 
  

  

  Hab. 
  Para. 
  Type 
  from 
  Igarape-Assu. 
  Alt. 
  50 
  m. 
  

  

  Type. 
  Adult 
  female. 
  B.M. 
  no. 
  4. 
  7. 
  4. 
  100. 
  Original 
  

   number 
  1879. 
  Collected 
  12th 
  May, 
  1904, 
  by 
  A. 
  Robert. 
  

   Presented 
  by 
  Oldfield 
  Thomas. 
  

  

  