﻿DANGEROUS 
  REPTILES 
  — 
  COCHRAN 
  

  

  283 
  

  

  their 
  skins. 
  A 
  diamond 
  or 
  chevron 
  in 
  brown 
  or 
  gray 
  on 
  a 
  light 
  tan 
  

   ground 
  is 
  often 
  the 
  basis 
  of 
  the 
  color 
  pattern. 
  The 
  diamondback 
  has 
  

   an 
  unusually 
  distinct 
  diamond 
  design 
  ; 
  hence 
  its 
  name. 
  

  

  VENOM 
  OUCT 
  

  

  FLESHY 
  

   SHEATH 
  

  

  ORIFICE 
  OF 
  FANG 
  

  

  VENOM 
  OUCT 
  

  

  /' 
  

  

  -PHANTOM 
  SKETCH 
  OF 
  TONGUE 
  

  

  (HOT 
  I*T«UOtD 
  WHIN 
  BITINO) 
  

  

  POISON 
  FANG 
  

   OENTARY 
  

  

  Figtjbe 
  1. 
  — 
  Upper, 
  diagram 
  of 
  venom 
  apparatus 
  of 
  rattlesnake. 
  Lower, 
  diagram 
  

   of 
  bones 
  involved 
  in 
  biting 
  mechanism 
  of 
  rattlesnake. 
  A, 
  jaws 
  closed, 
  fang 
  

   folded 
  back 
  against 
  roof 
  of 
  mouth 
  ; 
  B, 
  jaws 
  open 
  and 
  fang 
  erected 
  for 
  biting. 
  

   (From 
  The 
  reptiles 
  of 
  Ontario, 
  by 
  E. 
  B. 
  S. 
  Logier, 
  1939.) 
  

  

  The 
  pit 
  vipers 
  are 
  so 
  named 
  from 
  the 
  presence 
  of 
  a 
  small 
  pit 
  in 
  the 
  

   side 
  of 
  the 
  head 
  between 
  the 
  eye 
  and 
  nostril. 
  This 
  pit 
  is 
  filled 
  with 
  

   sensory 
  cells 
  the 
  function 
  of 
  which 
  is 
  still 
  somewhat 
  in 
  doubt. 
  It 
  is 
  

  

  