﻿Smithsonian 
  Report, 
  1943. 
  Cochran 
  

  

  PLATE 
  4 
  

  

  1. 
  Tropical 
  rattlesnake 
  (Crotalvs 
  durissus 
  terrificus), 
  also 
  called 
  cascabel. 
  Color: 
  yellowish 
  gray 
  with 
  

   large 
  dark 
  brown 
  "diamonds" 
  on 
  the 
  body, 
  and 
  a 
  pair 
  of 
  dark 
  longitudinal 
  stripes 
  on 
  the 
  neck. 
  Length: 
  

   6 
  to 
  7 
  feet. 
  Range: 
  drier 
  parts 
  of 
  the 
  Guianas, 
  Venezuela 
  and 
  Colombia 
  to 
  northern 
  Argentina, 
  Paraguay, 
  

   and 
  southern 
  Brazil. 
  Most 
  poisonous 
  of 
  all 
  the 
  rattlers: 
  very 
  aggressive. 
  (Courtesy 
  Bulletin 
  of 
  the 
  Anti- 
  

   venin 
  Institute.) 
  

  

  f 
  2. 
  Bushmaster 
  (Lachesis 
  mutus), 
  a'.so 
  called 
  la 
  cascabela 
  muda 
  in 
  Central 
  America, 
  sirocucu 
  in 
  Brazil, 
  

   and 
  mapepire 
  z'anannain 
  Trinidad. 
  Color: 
  pale 
  brown, 
  often 
  pinkish, 
  with 
  a 
  series 
  of 
  large 
  brown 
  blotches 
  

   wider 
  on 
  the 
  back 
  and 
  abruptly 
  narrower 
  on 
  the 
  sides. 
  Length: 
  over 
  )l 
  feet. 
  Range: 
  southern 
  Central 
  

   America 
  through 
  tropical 
  South 
  America, 
  including 
  Trinidad. 
  Exceedingly 
  poisonous; 
  aggressive. 
  (Cour- 
  

   tesy 
  New 
  York 
  Zoological 
  Society.) 
  

  

  