﻿Mammals 
  from 
  British 
  East 
  Africa. 
  519 
  

  

  of 
  nasals 
  175 
  ; 
  width 
  of 
  palate 
  (inside 
  m 
  l 
  ) 
  7*5 
  ; 
  length 
  of 
  

   upper 
  cheek-teeth 
  97. 
  

  

  Hah. 
  Eusso 
  Nyiro. 
  

  

  Type. 
  Adult 
  male. 
  Original 
  number 
  91. 
  Collected 
  by 
  

   Mr. 
  A. 
  Blaney 
  Percival 
  on 
  the 
  9th 
  of 
  January, 
  19 
  1 
  1, 
  and 
  

   presented 
  by 
  him 
  to 
  the 
  British 
  Museum. 
  

  

  The 
  bright 
  orange 
  rufous 
  on 
  the 
  forehead 
  and 
  bead 
  and 
  

   orange-coloured 
  face 
  are 
  the 
  chief 
  characters 
  wherein 
  this 
  

   form 
  differs 
  from 
  X. 
  dabagala. 
  

  

  Xerus 
  dabagala 
  dorsalis, 
  subsp. 
  n. 
  

  

  S 
  . 
  1356, 
  1357, 
  1358, 
  1365, 
  1376, 
  1401, 
  1402, 
  1405, 
  1406, 
  

   1108; 
  ?. 
  1369, 
  1371, 
  1377, 
  1387, 
  1404, 
  1409, 
  1410. 
  

   Baringo. 
  

  

  Allied 
  to 
  X. 
  dabagala 
  stephanicus, 
  Thos., 
  from 
  which 
  it 
  is 
  

   distinguished 
  by 
  its 
  much 
  darker 
  dorsal 
  surface. 
  

  

  Size 
  and 
  general 
  proportions 
  as 
  in 
  the 
  other 
  members 
  of 
  

   this 
  group. 
  General 
  colour 
  of 
  back 
  dark 
  olive, 
  speckled 
  with 
  

   yellow 
  and 
  white, 
  the 
  general 
  effect 
  much 
  darker 
  than 
  in 
  

   stephanicus. 
  Top 
  of 
  head 
  black, 
  speckled 
  with 
  pale 
  buff 
  and 
  

   orange, 
  rather 
  darker 
  than 
  rest 
  of 
  dorsal 
  surface 
  and 
  

   markedly 
  different 
  from 
  the 
  brownish 
  head 
  of 
  stephanicus. 
  

  

  Orange 
  rufous 
  on 
  nose 
  and 
  colouring 
  of 
  face 
  much 
  as 
  in 
  

   stephanicus. 
  Flanks 
  richer 
  and 
  darker, 
  the 
  black 
  speckling 
  

   rather 
  more 
  evident. 
  Limbs, 
  ventral 
  surface, 
  and 
  tail 
  similar 
  

   to 
  those 
  of 
  X. 
  cl. 
  stephanicus. 
  

  

  Skull 
  much 
  as 
  in 
  X. 
  stephanicus, 
  broader 
  across 
  inter- 
  

   orbital 
  region 
  ; 
  auditory 
  bullce 
  less 
  inflated. 
  

  

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

   Head 
  and 
  body 
  239 
  mm. 
  ; 
  tail 
  192 
  ; 
  hind 
  foot 
  55 
  - 
  5 
  ; 
  

   ear 
  12. 
  

  

  Skull 
  : 
  greatest 
  length 
  54'5 
  ; 
  basilar 
  length 
  40*5 
  ; 
  condylo- 
  

   basilar 
  length 
  44*7 
  ; 
  condylo-incisive 
  length 
  47; 
  zygomatic 
  

   breadth 
  30 
  ; 
  interorbital 
  breadth 
  15 
  ; 
  breadth 
  of 
  brain-case 
  

   (across 
  squamosal 
  region) 
  24*6 
  ; 
  greatest 
  length 
  of 
  nasals 
  

   17'5 
  ; 
  palatilar 
  length 
  23'4 
  ; 
  width 
  of 
  palate 
  (inside 
  m 
  l 
  ) 
  6*9 
  ; 
  

   length 
  of 
  upper 
  cheek-teeth 
  9'7. 
  

  

  Hab. 
  Baringo, 
  British 
  East 
  Africa. 
  Altitude 
  4000 
  feet. 
  

   Type. 
  Adult 
  male. 
  B.M. 
  no. 
  10. 
  12. 
  19. 
  4. 
  Original 
  

   number 
  1376. 
  Collected 
  in 
  October 
  1910. 
  

  

  This 
  form, 
  though 
  evidently 
  closely 
  related 
  to 
  X. 
  d. 
  ste- 
  

   phanicus, 
  is 
  readily 
  recognized 
  by 
  the 
  dark 
  olive 
  coloration 
  of 
  

   the 
  dorsal 
  surface 
  and 
  the 
  blackish 
  area 
  on 
  the 
  top 
  of 
  the 
  

   head. 
  The 
  rufous 
  patch 
  on 
  the 
  muzzle 
  is 
  similar 
  to 
  that 
  of 
  

   stephanicus 
  and 
  therefore 
  renders 
  this 
  Baringo 
  form 
  easily 
  

  

  