﻿48 
  INTRODUCTION. 
  

  

  diapophysis 
  usually 
  about 
  once 
  and 
  a 
  half 
  as 
  

   long 
  as 
  tlie 
  seventh. 
  

  

  1. 
  Fronto-parietals 
  convex, 
  narrow; 
  nasals 
  

  

  with 
  straight 
  or 
  slightly 
  concave 
  posterior 
  

   border. 
  

   Nasals 
  widely 
  separated 
  from 
  each 
  other 
  ; 
  tibia 
  

   nearly 
  twice 
  as 
  long 
  as 
  the 
  tarsus. 
  

  

  B. 
  arvalis. 
  

  

  J^asals 
  narrowly 
  separated; 
  tibia 
  more 
  than 
  

  

  twice 
  as 
  long 
  as 
  the 
  tarsus 
  . 
  B. 
  camerani. 
  

  

  2. 
  Fronto-parietals 
  flat, 
  broad. 
  

  

  Nasals 
  with 
  concave 
  posterior 
  border; 
  tibia 
  

   slightly 
  longer 
  than 
  femur 
  . 
  B. 
  temjporaria. 
  

  

  Nasals 
  with 
  straight 
  or 
  convex 
  posterior 
  

   border; 
  tibia 
  considerably 
  longer 
  than 
  femur; 
  

   distal 
  phalanges 
  with 
  very 
  distinct 
  trans- 
  

   verse 
  expansion 
  at 
  the 
  end* 
  . 
  . 
  B. 
  grseca. 
  

  

  Nasals 
  with 
  concave 
  posterior 
  border; 
  tibia 
  

   considerably 
  longer 
  than 
  femur 
  . 
  B. 
  iberica. 
  

  

  Nasals 
  with 
  straight 
  or 
  feebly 
  concave 
  posterior 
  

   border; 
  tibia 
  considerably 
  longer 
  than 
  femur. 
  

  

  B. 
  latastii. 
  

  

  3. 
  Fronto-parietals 
  grooved, 
  moderately 
  broad 
  ; 
  

  

  nasals 
  with 
  straight 
  or 
  slightly 
  concave 
  

   posterior 
  border 
  ; 
  tibia 
  considerably 
  longer 
  

   than 
  femur 
  B, 
  agilis. 
  

  

  The 
  above 
  key, 
  it 
  must 
  be 
  observed, 
  is 
  drawn 
  up 
  

   from 
  skeletons 
  of 
  adult, 
  or 
  at 
  least 
  half-grown 
  speci- 
  

   mens, 
  and 
  must 
  necessarily 
  often 
  fail 
  in 
  its 
  object 
  if 
  

   applied 
  to 
  young 
  ones. 
  

  

  * 
  Quite 
  as 
  mucli 
  developed 
  as 
  in 
  the 
  species 
  on 
  wMcli 
  the 
  genus 
  

   Hylorana 
  or 
  Limnodytes 
  has 
  been 
  founded. 
  I 
  have 
  pointed 
  out 
  that 
  

   certain 
  Chinese 
  and 
  Burmese 
  forms 
  show 
  a 
  passage 
  to 
  exist 
  from 
  the 
  

   Ranpe 
  temporarise 
  to 
  the 
  Hyloranse, 
  and 
  this 
  view 
  is 
  further 
  confirmed 
  

   by 
  a 
  study 
  of 
  Bana 
  grseca. 
  

  

  