﻿RANA. 
  

  

  305 
  

  

  females 
  they 
  vary 
  from 
  pale 
  yellow 
  to 
  orange, 
  usually 
  

   spotted 
  or 
  marked 
  with 
  brown, 
  orange, 
  or 
  red. 
  There 
  

   are, 
  however, 
  specimens 
  in 
  which 
  the 
  belly 
  is 
  un- 
  

   spotted, 
  more 
  particularly 
  those 
  from 
  Spain. 
  

  

  Iris 
  golden, 
  sometimes 
  obscured 
  with 
  brown 
  vermi- 
  

   c 
  illations. 
  

  

  Males 
  differ 
  from 
  females 
  in 
  the 
  stronger, 
  more 
  

   muscular 
  fore 
  limbs, 
  which 
  acquire 
  an 
  extraordinary 
  

  

  Fig. 
  110. 
  

  

  Hand 
  and 
  foot 
  of 
  breeding 
  male 
  (lower 
  views). 
  

  

  development 
  during 
  the 
  pairing 
  season 
  ; 
  the 
  pad-like 
  

   swelling 
  of 
  the 
  inner 
  side 
  of 
  the 
  first 
  finger, 
  which 
  

   becomes 
  covered 
  with 
  black 
  horny 
  spinules 
  during 
  

   the 
  pairing 
  season 
  ; 
  the 
  greater 
  development 
  of 
  the 
  

  

  Fig. 
  111. 
  

  

  Y 
  

  

  > 
  

  

  Gular 
  region 
  of 
  breeding 
  male, 
  with 
  inflated 
  vocal 
  sacs. 
  

  

  web 
  between 
  the 
  toes 
  ; 
  and 
  the 
  presence 
  of 
  a 
  pair 
  of 
  

  

  internal 
  vocal 
  sacs, 
  situated 
  at 
  the 
  sides 
  of 
  the 
  throat. 
  

  

  In 
  breeding 
  males 
  the 
  skin 
  acquires 
  a 
  spongy 
  ap- 
  

  

  x 
  

  

  