﻿24 
  On 
  new 
  Reptiles 
  from 
  the 
  Andes 
  of 
  South 
  America. 
  

  

  three 
  occipitals, 
  median 
  smallest 
  ; 
  postoccipitals 
  not 
  or 
  but 
  

   feebly 
  enlarged 
  ; 
  three 
  supraoculars, 
  the 
  first 
  as 
  large 
  as 
  or 
  

   larger 
  than 
  the 
  third, 
  with 
  which 
  it 
  is 
  sometimes 
  in 
  contact 
  

   on 
  the 
  outer 
  side 
  of 
  the 
  second 
  ; 
  nostril 
  in 
  a 
  single 
  or 
  divided 
  

   nasal; 
  a 
  single 
  loreal 
  and 
  a 
  freno-orbital 
  ; 
  upper 
  temporals 
  

   large 
  ; 
  7 
  or 
  8 
  upper 
  and 
  5 
  or 
  6 
  lower 
  labials 
  ; 
  chin-shields, 
  

   one 
  anterior 
  and 
  3 
  or 
  4 
  pairs 
  ; 
  the 
  two 
  first 
  pairs 
  forming 
  a 
  

   suture; 
  none 
  of 
  the 
  gulars 
  strongly 
  enlarged 
  transversely; 
  

   9 
  or 
  10 
  collar-shields. 
  Dorsal 
  scales 
  rather 
  strongly 
  keeled, 
  

   narrow, 
  elongate 
  tetragonal 
  or 
  hexagonal 
  with 
  very 
  obtuse 
  

   angles; 
  lateral 
  scales 
  very 
  small; 
  38 
  to 
  45 
  scales, 
  including 
  

   ventrals, 
  round 
  the 
  middle 
  of 
  the 
  body, 
  39 
  to 
  46 
  from 
  occiput 
  

   to 
  base 
  of 
  tail. 
  Ventral 
  plates 
  in 
  12 
  longitudinal 
  and 
  19 
  to 
  

   21 
  transverse 
  rows 
  ; 
  the 
  two 
  median 
  plates 
  as 
  long 
  as 
  broad, 
  

   the 
  others 
  gradually 
  narrowing 
  towards 
  the 
  sides. 
  Two 
  

   anterior 
  and 
  4 
  to 
  6 
  posterior 
  preeanal 
  plates. 
  Subdigital 
  

   lamella? 
  smooth. 
  7 
  to 
  10 
  femoral 
  pores 
  on 
  each 
  side 
  in 
  males, 
  

   to 
  7 
  in 
  females. 
  Caudal 
  scales 
  quadrangular, 
  upper 
  keeled, 
  

   lower 
  smooth,, 
  Olive 
  above, 
  usually 
  with 
  a 
  lighter, 
  black- 
  

   edged 
  vertebral 
  band, 
  widening 
  towards 
  the 
  head, 
  of 
  which 
  it 
  

   occupies 
  the 
  upper 
  surface; 
  sides 
  of 
  males 
  often 
  with 
  small 
  

   black 
  ocellar 
  spots 
  with 
  white 
  centres; 
  belly 
  greyish, 
  more 
  

   or 
  less 
  profusely 
  spotted 
  with 
  black 
  ; 
  lower 
  surface 
  of 
  hind 
  

   limbs 
  and 
  tail 
  often 
  red, 
  

  

  6- 
  ?. 
  

  

  mm. 
  mm. 
  

  

  Total 
  length 
  180 
  1G6 
  

  

  Head 
  17 
  13 
  

  

  Width 
  of 
  head 
  12 
  9 
  

  

  From 
  end 
  of 
  snout 
  to 
  fore 
  limb 
  .... 
  24 
  22 
  

  

  „ 
  „ 
  „ 
  ,, 
  vent 
  70 
  66 
  

  

  Fore 
  limb 
  20 
  18 
  

  

  Hind 
  limb 
  24 
  23 
  

  

  Tail 
  110 
  100 
  

  

  Numerous 
  specimens 
  from 
  Huancabamba, 
  E. 
  Peru, 
  above 
  

   3000 
  feet, 
  collected 
  by 
  Mr. 
  E. 
  Boettger. 
  

  

  This 
  species 
  differs 
  from 
  all 
  those 
  previously 
  referred 
  to 
  the 
  

   genus 
  Prionodactylus 
  in 
  the 
  number 
  (12) 
  of 
  the 
  longitudinal 
  

   rows 
  of 
  ventral 
  plates 
  and 
  in 
  the 
  shape 
  of 
  the 
  dorsal 
  scales. 
  

  

  Leptognathus 
  sancti-joannis. 
  

  

  Body 
  strongly 
  compressed. 
  Eye 
  moderate. 
  Rostral 
  a 
  

   little 
  broader 
  than 
  deep, 
  not 
  visible 
  from 
  above; 
  internasals 
  

   half 
  to 
  two-thirds 
  as 
  long 
  as 
  the 
  prsefrontals 
  ; 
  frontal 
  as 
  long 
  

   as 
  broad, 
  nearly 
  as 
  long 
  as 
  its 
  distance 
  from 
  the 
  end 
  of 
  the 
  

   snout, 
  shorter 
  than 
  the 
  parietals 
  ; 
  nasal 
  divided 
  ; 
  loreal 
  deeper 
  

  

  