﻿MAMMALS 
  OF 
  NORTHERN 
  COLOMBIA 
  — 
  ^HERSHKOVITZ 
  469 
  

  

  measured 
  on 
  a 
  horizontal 
  plane, 
  may 
  be 
  taken 
  as 
  a 
  fair 
  index 
  of 
  total 
  

   length 
  and 
  bulk 
  of 
  any 
  one 
  species. 
  This 
  measurement, 
  in 
  centimeters, 
  

   is 
  tabulated 
  below 
  according 
  to 
  the 
  number 
  of 
  functional 
  upper 
  molars. 
  

   In 
  the 
  tabulation, 
  the 
  first 
  measurement 
  of 
  each 
  tooth 
  group 
  is 
  average 
  

   length 
  of 
  skull, 
  figm-es 
  in 
  parentheses 
  are 
  extremes, 
  and 
  the 
  last 
  figure 
  

   shows 
  nimaber 
  of 
  specimens 
  measured. 
  

  

  M' 
  functional 
  M* 
  functional 
  M' 
  functional 
  

  

  bairdii 
  (36 
  specimens) 
  39 
  (38-41) 
  10 
  41 
  (40-43) 
  9 
  42 
  (40-44) 
  17 
  

  

  terrestris 
  (41 
  specimens) 
  37 
  (35-41) 
  9 
  38 
  (36-41) 
  15 
  38 
  (36-41) 
  17 
  

  

  pmcAa^we 
  (5 
  specimens) 
  35 
  37,40 
  37,38 
  

  

  It 
  is 
  practically 
  impossible 
  to 
  arrive 
  at 
  better 
  than 
  a 
  rough 
  estimate 
  

   of 
  differences 
  in 
  size 
  between 
  the 
  three 
  hving 
  species 
  of 
  American 
  

   tapirs. 
  There 
  may 
  be 
  as 
  marked 
  size 
  differences 
  between 
  two 
  indi- 
  

   viduals 
  or 
  populations 
  of 
  a 
  given 
  species 
  as 
  between 
  each 
  of 
  two 
  

   "comparable" 
  individuals 
  or 
  populations 
  of 
  different 
  species. 
  The 
  

   above 
  tabulation 
  shows 
  that 
  in 
  T. 
  terrestris 
  there 
  is 
  no 
  significant 
  

   relationship 
  between 
  age 
  and 
  size 
  after 
  the 
  second 
  upper 
  molar 
  becomes 
  

   functional. 
  The 
  same 
  appears 
  to 
  be 
  true 
  for 
  pinchaque, 
  but 
  bairdii 
  

   continues 
  to 
  grow 
  for 
  a 
  time 
  after 
  eruption 
  of 
  its 
  last 
  upper 
  molar. 
  

   A 
  specimen 
  of 
  terrestris 
  from 
  Rio 
  Grande 
  do 
  Sul, 
  Brazil, 
  with 
  the 
  

   largest 
  skull, 
  length 
  415 
  mm.,^ 
  still 
  has 
  the 
  second 
  upper 
  molar 
  deep 
  

   in 
  the 
  alveolus. 
  Another 
  skull 
  of 
  terrestris 
  from 
  Pozuzo, 
  Perti, 
  with 
  

   complete 
  and 
  worn 
  dentition 
  is 
  only 
  360 
  mm. 
  long. 
  Other 
  specimens 
  

   from 
  the 
  same 
  regions 
  indicate 
  that 
  difference 
  in 
  length 
  between 
  the 
  

   two 
  skulls 
  is 
  purely 
  individual. 
  Importance 
  of 
  individual 
  variation 
  

   in 
  estimating 
  size 
  differences 
  between 
  species 
  may 
  also 
  be 
  demon- 
  

   strated. 
  A 
  fully 
  adult 
  specimen 
  of 
  the 
  larger 
  bairdii, 
  from 
  Tiger 
  Hill, 
  

   C. 
  Z., 
  has 
  a 
  combined 
  head 
  and 
  body 
  length 
  of 
  193 
  cm., 
  while 
  a 
  

   "comparable" 
  individual 
  of 
  the 
  smaller 
  terrestris 
  from 
  Mato 
  Grosso, 
  

   Brazil, 
  measures 
  201 
  cm. 
  

  

  The 
  few 
  available 
  measurements 
  indicate 
  that 
  the 
  Malay 
  tapir, 
  

   Tapirus 
  indicus, 
  averages 
  slightly 
  larger 
  than 
  T. 
  bairdii. 
  

  

  Subgenus 
  Pinchacus 
  ^ 
  Gray 
  

  

  Cinchacus 
  [sic] 
  Gray, 
  Hand-list 
  of 
  the 
  edentate, 
  thick-skinned, 
  and 
  ruminant 
  

   mammals 
  in 
  the 
  British 
  Museum, 
  p. 
  34, 
  1873 
  (typographical 
  error 
  for 
  

   Pinchacus; 
  genotype 
  by 
  monotypy, 
  Tapirus 
  leucogenys 
  Gray 
  = 
  TapzVws 
  

   pinchaque 
  Roulin). 
  

  

  Inclvded 
  species. 
  — 
  Tapirus 
  pinchxique 
  Roulin. 
  

  

  ' 
  Actually, 
  in 
  terrestris 
  the 
  gieatest 
  skull 
  length, 
  420 
  mm., 
  is 
  of 
  a 
  menagerie 
  specimen. 
  This 
  individual 
  

   died 
  at 
  the 
  age 
  of 
  32 
  years 
  after 
  living 
  27 
  years 
  in 
  the 
  National 
  Zoological 
  Park, 
  Washington. 
  

  

  ' 
  The 
  name 
  "Ctnchacus" 
  originally 
  proposed 
  by 
  Gray 
  is 
  so 
  obviously 
  a 
  typographical 
  error 
  that 
  it 
  is 
  

   quite 
  permissible, 
  according 
  to 
  article 
  19 
  of 
  the 
  International 
  Code 
  of 
  Zoological 
  Nomenclature, 
  to 
  emend 
  

   the 
  spelling 
  to 
  Pinchacus 
  in 
  conformity 
  with 
  both 
  the 
  etymology 
  and 
  the 
  author's 
  intent. 
  

  

  