﻿SOUTH 
  AMERICAN 
  SNAKES 
  AMARAL 
  

  

  25 
  

  

  I 
  believe 
  that 
  these 
  figures 
  are 
  so 
  definite 
  because 
  Boulenger 
  had 
  

   at 
  his 
  disposal 
  only 
  23 
  specimens, 
  which, 
  of 
  course, 
  constitute 
  a 
  rela- 
  

   tively 
  small 
  series. 
  I, 
  myself, 
  having 
  studied 
  13 
  specimens 
  in 
  the 
  

   United 
  States 
  National 
  Museum, 
  was 
  afterwards 
  able 
  to 
  examine 
  

   and 
  compare 
  31 
  specimens 
  in 
  the 
  Museum 
  of 
  Comparative 
  Zoology 
  

   and 
  the 
  large 
  collection 
  of 
  the 
  Instituto 
  do 
  Butantan, 
  which 
  I 
  received 
  

   in 
  the 
  meantime. 
  The 
  latter 
  collection 
  consisted 
  of 
  58 
  specimens, 
  

   thus 
  making 
  a 
  total 
  of 
  102 
  specimens. 
  As 
  a 
  result 
  I 
  have 
  ascertained 
  

   that 
  as 
  a 
  rule 
  the 
  female 
  specimens 
  have 
  a 
  larger 
  number 
  of 
  ventrals, 
  

   due 
  to 
  the 
  fact 
  that 
  they 
  have 
  a 
  larger 
  number 
  of 
  dorsal 
  vertebrae 
  

   than 
  the 
  males, 
  and 
  that 
  at 
  the 
  same 
  time 
  they 
  usually 
  have 
  a 
  larger 
  

   number 
  of 
  annuli. 
  This 
  condition 
  is 
  particularly 
  evident 
  in 
  large 
  

   series 
  of 
  specimens, 
  as, 
  for 
  instance, 
  in 
  that 
  from 
  Sao 
  Paulo, 
  Brazil, 
  

   which 
  is 
  tabulated 
  below. 
  

  

  The 
  102 
  specimens 
  examined 
  were 
  as 
  follows: 
  

  

  Museum 
  

  

  No. 
  

  

  Locality 
  

  

  So. 
  America 
  

  

  Brazil 
  

  

  Brazil 
  (Amazonas) 
  

  

  Dutch 
  Guiana 
  

  

  Brazil 
  (S. 
  Paulo) 
  

  

  Trinidad 
  

  

  do 
  

  

  do... 
  

  

  do 
  

  

  do.. 
  - 
  

  

  do.. 
  

  

  do... 
  -.- 
  

  

  do 
  -. 
  

  

  do 
  -..- 
  

  

  do 
  - 
  - 
  

  

  So. 
  America. 
  

  

  do 
  

  

  do 
  

  

  Venezuela 
  

  

  Peru 
  

  

  Brazil 
  (Amazonas) 
  

  

  Brazil 
  (Para) 
  

  

  Brazil 
  (Pernambuco) 
  

  

  do 
  

  

  Brazil 
  (Bahia) 
  

  

  do 
  

  

  do 
  

  

  do 
  

  

  do 
  

  

  Brazil 
  (Rio) 
  

  

  Brazil 
  (Esp. 
  Santo) 
  

  

  Brazil 
  (Rio) 
  

  

  do 
  

  

  do 
  

  

  Brazil 
  (S. 
  Paulo) 
  

  

  Brazil 
  (Para) 
  

  

  do... 
  

  

  Brazil 
  (Bahia) 
  

  

  do 
  

  

  Brazil 
  (Amazonas) 
  

  

  Brazil 
  (Minas) 
  

  

  do 
  _ 
  _ 
  

  

  Brazil 
  (Bahia) 
  

  

  Brazil 
  (Minas) 
  

  

  Brazil 
  (S. 
  Paulo) 
  

  

  '"SJido""""""'.'.'.'.'.'.'.'. 
  

  

  do 
  

  

  do 
  

  

  Brazil 
  (Amazonas)... 
  

  

  c. 
  

  

  25p.+ 
  .. 
  

  

  37 
  p 
  

  

  39 
  p 
  

  

  38 
  p 
  

  

  30 
  p 
  

  

  33 
  p 
  

  

  35p.+2_. 
  

   32p.+3_. 
  

   27p.+7.. 
  

   34p.+3.. 
  

   30p.+S__ 
  

  

  26 
  p 
  

  

  27p.+5_. 
  

  

  30 
  p 
  

  

  34p.+2_. 
  

  

  40p 
  

  

  36 
  p. 
  +2.. 
  

   24p.+3.. 
  

  

  29p 
  

  

  36 
  p 
  

  

  42p 
  

  

  35 
  p 
  

  

  22p.+2_. 
  

  

  27 
  p 
  

  

  41 
  p 
  

  

  24 
  p 
  

  

  24 
  p 
  

  

  17p.+5_. 
  

   22-p+2. 
  

  

  26 
  p 
  

  

  5p.+ 
  18_. 
  

  

  25 
  p 
  

  

  18p.+0_. 
  

  

  23 
  p 
  

  

  33p.+ 
  l- 
  

  

  36 
  p 
  

  

  12 
  p. 
  + 
  12 
  

   26p.+ 
  l. 
  

  

  25 
  p 
  

  

  13p.+8. 
  

  

  36 
  p 
  

  

  28p 
  

  

  25 
  p 
  

  

  27 
  p.+3. 
  

  

  30p 
  

  

  35 
  p 
  

  

  32p 
  

  

  31 
  p 
  

  

  27p.+2. 
  

   41 
  p 
  

  

  Triads 
  of 
  annuli 
  

  

  Body 
  Tail 
  

  

  1+ 
  

  

  