﻿Mammah 
  from 
  British 
  East 
  Africa. 
  52? 
  

  

  Skull: 
  greatest 
  length 
  33'6; 
  basilar 
  length 
  27*7; 
  condylo- 
  

   incisive 
  length 
  31*6 
  ; 
  zygomatic 
  breadth 
  16 
  ; 
  interorbital 
  

   breadth 
  4 
  - 
  7 
  ; 
  breadth 
  of 
  brain-case 
  (across 
  squamosal 
  region) 
  

   13; 
  length 
  of 
  nasals 
  14 
  ; 
  palatilar 
  length 
  152 
  ; 
  width 
  of 
  

   palate 
  (inside 
  m 
  x 
  ) 
  3 
  ; 
  length 
  of 
  palatal 
  foramina 
  8'2 
  ; 
  length 
  

   of 
  upper 
  molar 
  series 
  5*8. 
  

  

  Hab. 
  Baringo, 
  Altitude 
  4000 
  feet. 
  

  

  Type. 
  Old 
  male. 
  B.M. 
  no. 
  10. 
  12. 
  19. 
  30. 
  Original 
  

   number 
  1333. 
  Collected 
  on 
  October 
  7th, 
  1910. 
  

  

  This 
  species 
  is 
  readily 
  recognized 
  by 
  the 
  pale 
  greyish-olive 
  

   colour 
  of 
  the 
  dorsal 
  surface 
  and 
  light 
  buffy-grey 
  flanks. 
  

   The 
  most 
  nearly 
  allied 
  species 
  appears 
  to 
  be 
  E. 
  ugandce, 
  

   which 
  agrees 
  with 
  this 
  new 
  form 
  as 
  regards 
  the 
  dimensions 
  

   of 
  the 
  body, 
  but 
  differs 
  in 
  its 
  longer 
  hind 
  foot 
  and 
  tail 
  and 
  

   rather 
  large 
  skull, 
  in 
  addition 
  to 
  the 
  striking 
  colour 
  differ- 
  

   ences 
  already 
  referred 
  to. 
  The 
  other 
  Baringo 
  species, 
  

   described 
  above, 
  apart 
  from 
  its 
  much 
  richer 
  coloration, 
  is 
  at 
  

   once 
  distinguished 
  by 
  the 
  smaller 
  size 
  of 
  the 
  hind 
  foot 
  and 
  

   skull. 
  

  

  Leggada 
  grata, 
  Thos. 
  

   S- 
  1679; 
  ? 
  . 
  1670. 
  Solai, 
  Mt. 
  Kenya. 
  

  

  Leggada 
  triton, 
  Thos. 
  

  

  rf. 
  1603, 
  1615, 
  1620, 
  1624, 
  1626, 
  1632, 
  1646, 
  1681; 
  

   ? 
  . 
  1528, 
  1555, 
  1598, 
  1610, 
  1611, 
  1612, 
  1613, 
  1611, 
  1625, 
  

   1657, 
  1671. 
  Solai, 
  Mt. 
  Kenya. 
  

  

  Thamnomys 
  gigas, 
  sp. 
  n. 
  

  

  A 
  large 
  richly 
  coloured 
  species 
  with 
  a 
  very 
  massive 
  skull. 
  

  

  In 
  size 
  and 
  general 
  proportions 
  about 
  as 
  in 
  T. 
  ibeanus, 
  

   Osg., 
  tail 
  especially 
  long. 
  General 
  colour 
  of 
  back 
  olive- 
  

   grey 
  washed 
  with 
  tawny 
  buff, 
  the 
  reddish 
  tint 
  increasing 
  

   posteriorly, 
  on 
  the 
  hind 
  - 
  quarters 
  and 
  rump 
  becoming- 
  

   bright 
  orange-red 
  (tan 
  colour 
  no. 
  1, 
  ' 
  Repertoire 
  de 
  Cou- 
  

   leurs'), 
  the 
  general 
  effect 
  being 
  much 
  as 
  in 
  the 
  West 
  

   African 
  T. 
  rutiluns, 
  but 
  rather 
  darker. 
  Head, 
  sides 
  of 
  face, 
  

   neck, 
  and 
  shoulders 
  washed 
  with 
  yellowish 
  buff. 
  Flanks 
  

   richly 
  tinted 
  with 
  orange-buff 
  and 
  sharply 
  marked 
  off 
  from 
  

   the 
  white 
  underparts. 
  Backs 
  of 
  hands 
  and 
  feet 
  buff-coloured. 
  

   Entire 
  under 
  surface 
  white, 
  tinted 
  with 
  very 
  pale 
  pinkish 
  

   buff, 
  the 
  general 
  colour 
  appearing 
  as 
  almost 
  white. 
  Tail 
  

   long 
  and 
  rather 
  more 
  hairy 
  than 
  in 
  T. 
  ibeanus. 
  

  

  Skull 
  very 
  large 
  and 
  massive. 
  Brain-case 
  much 
  larger 
  

  

  