﻿J1YLA, 
  251 
  

  

  Sardinia, 
  in 
  Cyprus, 
  in 
  Syria, 
  and 
  in 
  Persia. 
  We 
  

   have 
  here 
  to 
  deal 
  with 
  a 
  case 
  of 
  colour-dimorphism 
  

   which 
  is 
  the 
  more 
  striking 
  from 
  the 
  fact 
  that 
  in 
  most 
  

   parts 
  of 
  Europe 
  the 
  coloration 
  of 
  the 
  tree-frog, 
  apart 
  

   from 
  the 
  play 
  of 
  the 
  chromatophores, 
  is 
  so 
  very 
  

   constant. 
  

  

  These 
  spotted 
  or 
  striped 
  examples 
  are 
  of 
  further 
  

   interest 
  in 
  throwing 
  light 
  upon 
  the 
  origin 
  of 
  the 
  

   curious 
  lumbar 
  marking 
  of 
  the 
  typical 
  form. 
  Elongate, 
  

   dark, 
  light-edged 
  spots 
  may 
  form 
  a 
  regular 
  series 
  along 
  

   each 
  side 
  of 
  the 
  back, 
  the 
  last 
  spot 
  meeting 
  at 
  an 
  

   angle 
  the 
  lateral 
  dark 
  streak, 
  with 
  which 
  it 
  may 
  even 
  

   sometimes 
  be 
  almost 
  confluent, 
  as 
  is 
  shown 
  on 
  one 
  

   side 
  in 
  a 
  Sardinian 
  specimen 
  in 
  M. 
  Lataste's 
  collection 
  

   (PI. 
  XV, 
  fig. 
  1), 
  and 
  in 
  a 
  Japanese 
  specimen 
  in 
  the 
  

   British 
  Museum 
  (fig. 
  5). 
  There 
  is 
  every 
  reason 
  to 
  

   believe 
  that 
  these 
  examples 
  represent 
  the 
  original 
  

   form 
  from 
  which 
  the 
  other 
  colour-varieties 
  have 
  been 
  

   derived, 
  and 
  that 
  the 
  lumbar 
  marking 
  of 
  the 
  typical 
  

   H. 
  arbor 
  ea 
  is 
  to 
  be 
  looked 
  upon 
  as 
  the 
  remains 
  of 
  a 
  

   second, 
  upper 
  longitudinal 
  stripe. 
  

  

  Some 
  specimens 
  (Cyprus) 
  have 
  four 
  stripes 
  or 
  series 
  

   of 
  spots 
  in 
  addition 
  to 
  the 
  lateral 
  ; 
  others 
  (Japan) 
  

   have 
  a 
  pair 
  of 
  _]- 
  or 
  >-shaped 
  markings 
  on 
  the 
  

   scapular 
  region. 
  

  

  3. 
  Var. 
  intermedia, 
  Blgr. 
  Agrees 
  with 
  the 
  typical 
  

   form 
  in 
  having 
  a 
  lateral 
  line 
  and 
  a 
  mark 
  on 
  the 
  loin 
  ; 
  

   but 
  the 
  green 
  extends 
  on 
  the 
  sides 
  of 
  the 
  throat, 
  as 
  

   in 
  var. 
  meridionalis. 
  This 
  variety 
  was 
  established 
  on 
  

   a 
  specimen 
  from 
  Bologna 
  and 
  another 
  from 
  Sicily, 
  

   which 
  are 
  perhaps 
  only 
  mongrels 
  between 
  the 
  typical 
  

   form 
  and 
  the 
  var. 
  meridionalis. 
  

  

  4. 
  Var. 
  meridionalis, 
  Bttgr. 
  (_perezi, 
  Bosca, 
  barytonns, 
  

   Heron-Roy 
  er). 
  The 
  green 
  of 
  the 
  upper 
  surfaces 
  

   extends 
  on 
  each 
  side 
  of 
  the 
  throat, 
  where 
  it 
  gradu- 
  

   ally 
  vanishes, 
  or 
  involves 
  nearly 
  the 
  whole 
  of 
  the 
  

   vocal 
  sac 
  ; 
  a 
  dark 
  brown 
  or 
  golden 
  line 
  from 
  the 
  

   nostril 
  to 
  the 
  eye, 
  usually 
  continued 
  behind 
  the 
  Jatter, 
  

   covering 
  entirely 
  or 
  partially 
  the 
  tympanum 
  ; 
  no 
  

  

  