﻿572 
  Mr. 
  O. 
  Tliomas 
  on 
  

  

  from 
  the 
  actual 
  type-locality 
  of 
  sciUato7', 
  must, 
  I 
  think, 
  be 
  

   synonymous 
  with 
  it. 
  Like 
  that 
  animal, 
  it 
  is 
  distiuctly 
  

   smaller 
  than 
  A. 
  rilcJcbeili. 
  

  

  I 
  have 
  connected 
  Mr. 
  Riickbeil's 
  name 
  with 
  this 
  jerboa 
  in 
  

   recognition 
  of 
  the 
  pains 
  he 
  lias 
  taken 
  in 
  making 
  this 
  interesting- 
  

   collection 
  of 
  Djarkent 
  mammals. 
  

  

  Eleven. 
  

  

  30. 
  Allactaga 
  elater, 
  Licht. 
  

  

  31. 
  Lepus 
  sp. 
  

  

  Three. 
  

  

  Probably 
  L. 
  lehnanni, 
  Sev. 
  

  

  32. 
  Ochotona 
  sacana, 
  sp. 
  n. 
  

  

  Seven 
  from 
  Przewalsk. 
  

  

  Like 
  0. 
  macrolis, 
  but 
  warmer 
  coloured, 
  especially 
  on 
  the 
  

   flanks. 
  

  

  Size 
  and 
  all 
  essential 
  characters 
  as 
  in 
  0. 
  macrolis. 
  General 
  

   colour 
  above 
  in 
  winter 
  pelage 
  buflfy 
  brown 
  of 
  a 
  considerably 
  

   warmer 
  and 
  stronger 
  tone 
  than 
  the 
  whitish 
  butFy 
  of 
  the 
  

   winter 
  pelage 
  of 
  macrotis. 
  On 
  the 
  sides 
  and 
  rump, 
  instead 
  

   of 
  getting 
  wliiter, 
  the 
  ends 
  of 
  the 
  hairs 
  become 
  more 
  rufous, 
  

   so 
  that 
  the 
  flanks 
  are 
  distinctly 
  cinnamon, 
  the 
  basal 
  two- 
  

   thirds 
  of 
  the 
  hairs 
  being, 
  however, 
  still 
  dark 
  plumbeous 
  and 
  

   a 
  subapical 
  band 
  white. 
  Under 
  surface 
  dull 
  whitish, 
  faintly 
  

   washed 
  with 
  cinnamon. 
  Centre 
  of 
  face 
  pale 
  cinnamon. 
  

   Ears 
  large, 
  blackish 
  brown 
  on 
  proectote, 
  greyish 
  white 
  on 
  

   metentote. 
  Hands 
  and 
  feet 
  buffy 
  white 
  above 
  ; 
  palms 
  and 
  

   soles 
  greyish. 
  

  

  Skull 
  as 
  in 
  0. 
  macrotis. 
  Frontal 
  vacuities 
  present 
  in 
  all 
  

   the 
  specimens. 
  

  

  Dimensions 
  of 
  the 
  type 
  (measured 
  on 
  skin) 
  : 
  — 
  

  

  Head 
  and 
  body 
  (c.) 
  200 
  mm. 
  ; 
  hind 
  foot 
  33 
  ; 
  ear 
  28. 
  

  

  Skull 
  : 
  greatest 
  length 
  47 
  ; 
  condylo-incisive 
  length 
  44 
  ; 
  

   zvgomatic 
  breadth 
  22*5 
  ; 
  nasals 
  16 
  x 
  5"5 
  ; 
  interorbital 
  breadth 
  

   5*3 
  ; 
  breadth 
  of 
  brain-case 
  above 
  meatus 
  18 
  ; 
  palatal 
  foramina 
  

   13*5 
  X 
  4*7 
  ; 
  breadth 
  of 
  palatal 
  bridge 
  1*8 
  ; 
  upper 
  tooth-series 
  

   (alveoli) 
  9. 
  

  

  Hab. 
  Przewalsk. 
  

  

  Ti/jye, 
  Adult 
  male. 
  P.M. 
  no. 
  14. 
  5. 
  10. 
  219. 
  Original 
  

   number 
  442. 
  Collected 
  15th 
  December, 
  1913. 
  

  

  While 
  undoubtedly 
  nearly 
  allied 
  to 
  0. 
  macrotis, 
  this 
  pika 
  

  

  