﻿various 
  South-American 
  Mammals. 
  355 
  

  

  of 
  tlie 
  greatest 
  of 
  all 
  naturalists, 
  whose 
  connection 
  with 
  its 
  

   distinction 
  has 
  been 
  related 
  above. 
  

  

  Cerdocyon 
  mimax, 
  sp. 
  n. 
  

  

  Externally 
  quite 
  like 
  examples 
  from 
  the 
  same 
  locality 
  of 
  

   C. 
  thous 
  brasiliensis, 
  but 
  the 
  skull 
  and 
  teeth 
  very 
  markedly 
  

   larger. 
  

  

  Colour 
  quite 
  as 
  in 
  brasiliensis. 
  Back 
  of 
  ears 
  blackish, 
  

   a 
  butfy-brown 
  area 
  round 
  their 
  bases. 
  Feet 
  black, 
  with 
  a 
  

   slight 
  greyisli 
  mixture 
  on 
  the 
  metapodials. 
  

  

  Skull 
  (of 
  a 
  female, 
  as 
  compared 
  with 
  two 
  males) 
  markedly 
  

   larger 
  in 
  all 
  dimensions. 
  Forehead 
  more 
  convex, 
  the 
  height 
  

   of 
  the 
  skull 
  distinctly 
  greater. 
  Median 
  area 
  between 
  masse- 
  

   teric 
  fossae 
  of 
  the 
  usual 
  narrow 
  urn-shape. 
  

  

  Teeth 
  larger 
  throughout. 
  Premolars 
  longer 
  and 
  narrower, 
  

   the 
  third 
  longer 
  than 
  the 
  second. 
  Carnassial 
  and 
  molars 
  all 
  

   larger 
  than 
  mhrasiliensis 
  (see 
  measurements). 
  

  

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

  

  Head 
  and 
  body 
  755 
  mm. 
  ; 
  tail 
  305 
  ; 
  hind 
  foot 
  132 
  ; 
  

   ear 
  75. 
  

  

  Skull 
  : 
  condylo-basal 
  length 
  147'5 
  ; 
  zygomatic 
  breadth 
  80 
  ; 
  

   nasals 
  on 
  middle 
  line 
  49; 
  interorbital 
  breadth 
  29; 
  inter- 
  

   temporal 
  breadth 
  33 
  ; 
  postorbital 
  process 
  to 
  deltoid 
  ridge 
  69 
  ; 
  

   breadth 
  of 
  brain-case 
  49'5 
  ; 
  palatal 
  length 
  75. 
  

  

  Teeth 
  (those 
  of 
  a 
  male 
  brasiliensis 
  in 
  brackets) 
  : 
  diameter 
  

   of 
  canine 
  on 
  cingulum 
  6'5 
  (6*3) 
  ; 
  horizontal 
  length 
  of 
  />^ 
  4*6, 
  

   p^ 
  7-9 
  (7-3), 
  p^ 
  9-5 
  (7-2), 
  j'^ 
  on 
  outer 
  edge 
  15-2 
  (12-3); 
  com- 
  

   bined 
  length 
  of 
  m^ 
  and 
  m^ 
  21 
  (18*2) 
  ; 
  greatest 
  diameter 
  of 
  

   m^ 
  14-6 
  (13-6). 
  

  

  Hab. 
  Chapada, 
  Matto 
  Grosso. 
  Alt. 
  800 
  m. 
  

  

  Type. 
  Adult 
  female. 
  B.M. 
  no. 
  3. 
  7. 
  7. 
  39. 
  Collected 
  

   15th 
  October, 
  1902, 
  by 
  Alphonse 
  Robert. 
  Presented 
  by 
  

   Mrs. 
  Percy 
  Sladen. 
  

  

  The 
  uniformity 
  in 
  both 
  external 
  and 
  cranial 
  characters 
  of 
  

   all 
  the 
  available 
  specimens 
  of 
  Cerdocyon 
  from 
  Bahia 
  south- 
  

   wards 
  to 
  Rio 
  Grande 
  do 
  Sul 
  and 
  inland 
  to 
  Matto 
  Grosso 
  is 
  

   extreme, 
  these 
  representing 
  the 
  names 
  brasiliensis 
  (1821), 
  

   azarce 
  (1826), 
  guaraxa 
  (1839), 
  7nelampus 
  (1843), 
  melano- 
  

   stomus 
  (1843), 
  and 
  riograndensis 
  (1910). 
  The 
  skulls, 
  

   whether 
  of 
  male 
  or 
  female, 
  are 
  always 
  within 
  a 
  few 
  milli- 
  

   metres 
  of 
  138 
  mm. 
  in 
  condylo-basal 
  length, 
  and 
  the 
  upper 
  

   carnassial 
  is 
  always 
  about 
  12*5 
  mm. 
  on 
  its 
  outer 
  edge. 
  

  

  Furthermore, 
  there 
  is 
  little, 
  if 
  anything, 
  to 
  distinguish 
  

   this 
  widely-spread 
  Brazilian 
  animal 
  from 
  the 
  true 
  Guianan 
  

   thous 
  (1760), 
  but 
  the 
  available 
  specimens 
  of 
  the 
  latter 
  are 
  so 
  

  

  