﻿528 
  Mr. 
  G. 
  Dollman 
  on 
  

  

  than 
  in 
  the 
  allied 
  species. 
  Zygoma 
  stout 
  and 
  heavy. 
  Palatal 
  

   foramina 
  very 
  long. 
  Auditory 
  bullae 
  large 
  and 
  slightly 
  in- 
  

   flated. 
  Molar 
  teeth 
  exceptionally 
  large, 
  the 
  tooth-row 
  

   much 
  longer 
  and 
  broader 
  than 
  in 
  T. 
  ibeanus 
  or 
  any 
  of 
  the 
  

   surdaster 
  group. 
  

  

  Dimensions 
  of 
  the 
  type 
  (measured 
  in 
  the 
  flesh) 
  : 
  — 
  

  

  Head 
  and 
  body 
  132 
  mm. 
  ; 
  tail 
  201 
  ; 
  hind 
  foot 
  26*5 
  ; 
  

   ear 
  19. 
  

  

  Skull 
  : 
  greatest 
  length 
  35 
  - 
  5 
  ; 
  basal 
  length 
  29*5 
  ; 
  basilar 
  

   length 
  275 
  ; 
  condylo-basilar 
  length 
  29*8; 
  condylo-incisive 
  

   length 
  318; 
  zygomatic 
  breadth 
  16'9; 
  interorbital 
  breadth 
  5 
  ; 
  

   breadth 
  of 
  brain-case 
  (across 
  squamosal 
  region) 
  14 
  ; 
  greatest 
  

   length 
  of 
  nasals 
  12'7 
  ; 
  palatilar 
  length 
  14*5 
  : 
  width 
  of 
  palate 
  

   (inside 
  m 
  l 
  ) 
  3 
  ; 
  width 
  across 
  palate 
  (outside 
  m 
  1 
  ) 
  6 
  ; 
  length 
  

   of 
  palatal 
  foramina 
  7*9 
  ; 
  post-palatal 
  length 
  133 
  ; 
  length 
  of 
  

   upper 
  molar 
  series 
  5*5. 
  

  

  Bab. 
  Solai, 
  xMt. 
  Kenia. 
  Altitude 
  9000 
  feet. 
  

  

  Type. 
  Adult 
  male. 
  Original 
  number 
  1712. 
  Collected 
  on 
  

   December 
  28th, 
  1910. 
  

  

  This 
  large 
  species 
  is 
  distinguished 
  at 
  once 
  from 
  all 
  the 
  

   allied 
  forms 
  by 
  the 
  far 
  greater 
  size 
  of 
  the 
  skull. 
  A 
  

   further 
  specimen 
  referable 
  to 
  the 
  same 
  species 
  was 
  collected 
  

   by 
  Mr. 
  J. 
  L. 
  Clark 
  at 
  Kasituka, 
  west 
  of 
  Mt. 
  Kenya. 
  

  

  Thamnomys 
  surdaster 
  insignis, 
  subsp. 
  n. 
  

  

  <$ 
  . 
  1517 
  ; 
  ? 
  . 
  1467. 
  Rumruti, 
  Laikipia 
  Plateau. 
  

  

  <J. 
  415, 
  451; 
  ?. 
  427, 
  433, 
  446. 
  South 
  face 
  of 
  

   Mt. 
  Elgon. 
  

  

  Rather 
  smaller 
  in 
  size 
  than 
  T. 
  ibeanus, 
  Osg., 
  but 
  much 
  

   redder 
  in 
  colour 
  and 
  allied 
  to 
  T. 
  surdaster 
  polionops, 
  Osg. 
  

  

  General 
  colour 
  of 
  back 
  much 
  as 
  in 
  T. 
  surdaster, 
  but 
  darker 
  

   and 
  less 
  richly 
  coloured 
  anteriorly 
  ; 
  the 
  entire 
  dorsal 
  surface 
  

   washed 
  with 
  tawny 
  buff, 
  richer 
  on 
  the 
  posterior 
  portion 
  of 
  

   the 
  body. 
  General 
  colour 
  of 
  hind-quarters 
  reddish 
  buff 
  

   (brownish 
  terracotta 
  no. 
  2, 
  ' 
  Repertoire 
  de 
  Couleurs 
  ') 
  . 
  Flanks 
  

   pale 
  olive-grey, 
  strongly 
  tinted 
  with 
  pinkish 
  buff, 
  sharply 
  

   marked 
  off 
  from 
  the 
  white 
  underparts 
  by 
  a 
  pale 
  buff-coloured 
  

   line, 
  formed 
  by 
  the 
  pinkish-buff 
  tips 
  of 
  the 
  hairs 
  of 
  the 
  flanks 
  

   overlapping 
  the 
  white 
  hairs 
  of 
  the 
  belly. 
  Hairs 
  of 
  back 
  and 
  

   flanks 
  all 
  with 
  dark 
  slate-grey 
  bases. 
  Face 
  and 
  head 
  much 
  

   as 
  in 
  T. 
  ibeanus, 
  but 
  more 
  buffy. 
  Backs 
  of 
  hands 
  and 
  feet 
  

   white, 
  washed 
  with 
  buff. 
  Entire 
  underparts 
  white 
  ; 
  hairs 
  

   wholly 
  white. 
  Tail 
  long 
  and 
  hairy, 
  about 
  as 
  in 
  T. 
  ibeanus. 
  

  

  Skull 
  much 
  as 
  in 
  T. 
  surdaster, 
  rather 
  larger 
  in 
  size, 
  

   though 
  not 
  so 
  large 
  as 
  in 
  T. 
  ibeanus. 
  

  

  