﻿from 
  the 
  Andes 
  of 
  South 
  America. 
  23 
  

  

  Very 
  closely 
  allied 
  to 
  S. 
  simonsii, 
  Blgr., 
  but 
  form 
  more 
  

   slender, 
  dorsal 
  scales 
  more 
  strongly 
  keeled, 
  and 
  caudal 
  scales 
  

   not 
  spinose. 
  

  

  Ech 
  inosaura 
  pal 
  inert. 
  

  

  Snout 
  pointed, 
  longer 
  than 
  broad 
  ; 
  frontonasal 
  divided 
  into 
  

   two 
  by 
  a 
  longitudinal 
  suture 
  ; 
  one 
  pair 
  of 
  elongate 
  pre- 
  

   frontals, 
  a 
  large 
  frontal, 
  twice 
  as 
  long 
  as 
  broad, 
  a 
  pair 
  of 
  

   small 
  frontoparietals, 
  two 
  supraoculars, 
  the 
  rest 
  of 
  the 
  upper 
  

   surface 
  of 
  the 
  head 
  with 
  unequal-sized 
  flat 
  scales; 
  fronto- 
  

   nasals 
  striated, 
  the 
  other 
  head-shields 
  smooth 
  ; 
  nasal 
  single, 
  

   followed 
  by 
  a 
  large 
  loreal 
  ; 
  a 
  series 
  of 
  suboculars 
  ; 
  five 
  upper 
  

   and 
  four 
  lower 
  labials 
  ; 
  an 
  azjgous 
  chin-shield, 
  followed 
  by 
  

   two 
  pairs, 
  the 
  anterior 
  of 
  which 
  is 
  large. 
  Dorsal 
  scales 
  

   minutely 
  granular, 
  with 
  interrupted 
  series 
  of 
  large 
  keeled 
  or 
  

   conical 
  tubercles 
  ; 
  four 
  series 
  of 
  these 
  tubercles 
  on 
  the 
  nape; 
  

   numerous 
  tubercles 
  on 
  the 
  limbs. 
  Ventral 
  shields 
  smooth, 
  in 
  

   8 
  longitudinal 
  and 
  27 
  transverse 
  series. 
  Three 
  transverse 
  

   seiies 
  of 
  anal 
  shields. 
  6 
  femoral 
  pores 
  on 
  each 
  side. 
  En- 
  

   larged 
  tubercles 
  on 
  tail 
  keeled, 
  few, 
  forming 
  transverse 
  series. 
  

   Dark 
  brown 
  above, 
  with 
  two 
  longitudinal 
  series 
  of 
  large 
  pale 
  

   spots 
  ; 
  belly 
  pale 
  brownish, 
  spotted 
  with 
  black. 
  

  

  mm. 
  

  

  Total 
  length 
  147 
  

  

  Head 
  17 
  

  

  Width 
  of 
  head 
  10 
  

  

  From 
  end 
  of 
  snout 
  to 
  fore 
  limb 
  26 
  

  

  From 
  end 
  of 
  snout 
  to 
  vent 
  62 
  

  

  Fore 
  limb 
  18 
  

  

  Hind 
  limb 
  27 
  

  

  Tail 
  (reproduced) 
  85 
  

  

  A 
  single 
  male 
  specimen 
  from 
  Noananua, 
  Rio 
  San 
  Juan, 
  

   Choco, 
  S.W. 
  Colombia, 
  100 
  feet, 
  from 
  the 
  collection 
  of 
  

   Mr. 
  G. 
  Palmer. 
  

  

  Well 
  distinguished 
  from 
  the 
  type 
  of 
  the 
  genus, 
  E.lwrrida, 
  

   Blgr., 
  by 
  the 
  different 
  head-shields, 
  the 
  absence 
  of 
  a 
  double 
  

   vertebral 
  ridge, 
  the 
  less 
  spine-like 
  tubercles 
  on 
  the 
  throat 
  

   and 
  body, 
  and 
  the 
  smooth 
  ventral 
  shields. 
  

  

  Prionodactylus 
  spinalis. 
  

  

  Snout 
  short 
  ; 
  body 
  moderate. 
  Upper 
  head-shields 
  smooth 
  ; 
  

   frontonasal 
  single 
  ; 
  piaefrontals 
  forming 
  a 
  median 
  suture; 
  

   frontal 
  not 
  or 
  but 
  slightly 
  longer 
  than 
  the 
  frontonasal 
  ; 
  

   frontoparietals 
  smaller, 
  much 
  smaller 
  than 
  the 
  interparietal 
  

   and 
  parietals, 
  which 
  are 
  subequal 
  or 
  the 
  latter 
  the 
  broader; 
  

  

  