﻿386 
  Mr. 
  0. 
  Thomas 
  on 
  

  

  Uromtjs 
  naso, 
  sp. 
  n. 
  

  

  Near 
  U. 
  lorentzii, 
  but 
  skull 
  longer 
  and 
  more 
  compressed. 
  

  

  Size 
  slightly 
  larger 
  than 
  in 
  U. 
  lorentzii, 
  the 
  hind 
  foot 
  

   decidedly 
  longer. 
  Fur 
  crisp 
  and 
  velvety 
  ; 
  hairs 
  of 
  back 
  

   between 
  8 
  and 
  9 
  mm. 
  in 
  length. 
  General 
  colour 
  above 
  as 
  

   usual 
  brown, 
  becoming 
  more 
  rufous 
  on 
  rump. 
  Under 
  surface 
  

   greyish 
  white, 
  the 
  hairs 
  slaty 
  basally, 
  dull 
  greyish 
  white 
  

   terminally; 
  line 
  of 
  demarcation 
  on 
  sides 
  rather 
  well 
  defined. 
  

   Head 
  grey. 
  Hands 
  and 
  feet 
  dull 
  whitish. 
  Tail 
  black, 
  its 
  

   under 
  surface 
  inconspicuously 
  marked 
  with 
  dull 
  whitish 
  — 
  

   equally 
  different 
  from 
  the 
  sharply 
  bicolor 
  tail 
  of 
  lorentzii 
  and 
  

   the 
  wholly 
  black 
  one 
  of 
  the 
  next 
  species. 
  

  

  Skull 
  longer 
  and 
  narrower 
  than 
  that 
  of 
  U. 
  lorentzii, 
  the 
  

   greatest 
  spread 
  of 
  the 
  zygomata 
  at 
  their 
  anterior 
  end, 
  instead 
  

   of 
  posteriorly. 
  Muzzle 
  high, 
  narrow 
  and 
  compressed 
  late- 
  

   rally, 
  the 
  nasals 
  long 
  and 
  narrow. 
  Maxillary 
  part 
  of 
  zygo- 
  

   mata 
  broadened 
  vertically, 
  so 
  that 
  the 
  vertical 
  diameter, 
  

   opposite 
  the 
  back 
  of 
  m 
  l 
  , 
  is 
  nearly 
  3 
  mm., 
  the 
  broadest 
  in 
  a 
  

   series 
  of 
  lorentzii 
  being 
  under 
  2 
  mm. 
  Palatal 
  foramina 
  

   rather 
  longer 
  than 
  in 
  lorentzii. 
  Molars 
  comparatively 
  narrow. 
  

  

  Dimensions 
  of 
  the 
  type 
  (measured 
  in 
  flesh) 
  : 
  — 
  

  

  Head 
  and 
  body 
  188 
  mm.; 
  tail 
  132; 
  hind 
  foot 
  (s. 
  u.) 
  36; 
  

   ear 
  21. 
  

  

  Skull: 
  greatest 
  length 
  45*5; 
  condylo-incisive 
  length 
  f 
  

   41'3; 
  zygomatic 
  breadth 
  20*2; 
  nasals 
  17 
  X 
  5 
  ; 
  interorbital 
  

   breadth 
  7 
  ; 
  breadth 
  of 
  brain-case 
  16*5 
  ; 
  height 
  of 
  crown 
  from 
  

   alveolus 
  of 
  m' 
  2 
  11*6 
  ; 
  palatilar 
  length 
  21 
  ; 
  diastema 
  12*7 
  ; 
  

   palatal 
  foramina 
  7 
  x 
  3*2 
  ; 
  upper 
  molar 
  series 
  8*6. 
  

  

  Hab. 
  Kafari 
  River, 
  S.W. 
  New 
  Guinea. 
  Type 
  from 
  

   " 
  Whitewater 
  Camp." 
  Alt. 
  400'. 
  

  

  Type. 
  Adult 
  female. 
  Original 
  number 
  2512. 
  Collected 
  

   19th 
  October, 
  1910, 
  by 
  C. 
  H. 
  B.Grant 
  on 
  the 
  13.0.U. 
  Expe- 
  

   dition 
  to 
  New 
  Guinea. 
  Presented 
  by 
  the 
  Subscribers. 
  

  

  Compared 
  with 
  a 
  series 
  of 
  skulls 
  of 
  what 
  I 
  refer 
  to 
  

   Uromys 
  lorentzii, 
  Jent., 
  that 
  of 
  the 
  present 
  animal 
  is 
  at 
  once 
  

   distinguishable 
  by 
  its 
  more 
  elongate 
  shape, 
  compressed 
  

   muzzle, 
  and 
  by 
  the 
  peculiar 
  broadening 
  of 
  the 
  maxillary 
  part 
  

   of 
  the 
  zygomatic 
  arch. 
  Externally 
  the 
  animals 
  are 
  closely 
  

   similar, 
  though 
  U. 
  naso 
  has 
  not 
  the 
  conspicuously 
  bicolor 
  tail 
  

   of 
  U. 
  lorentzii, 
  and 
  its 
  foot 
  is 
  longer. 
  

  

  t 
  From 
  the 
  back 
  of 
  the 
  condyle 
  to 
  the 
  most 
  anterior 
  point 
  on 
  the 
  

   convex 
  front 
  surface 
  of 
  the 
  incisors. 
  This 
  measurement, 
  which 
  I 
  have 
  

   already 
  used 
  in 
  the 
  case 
  of 
  shrews, 
  I 
  believe 
  to 
  be 
  a 
  better 
  one 
  for 
  rodents 
  

   than 
  any 
  other 
  that 
  has 
  been 
  proposed. 
  

  

  