﻿402 
  

  

  W. 
  F. 
  FISKE. 
  

  

  Table 
  XXIII. 
  

   The 
  Relative 
  Attractiveness 
  of 
  Varanus, 
  Crocodile 
  and 
  Goat 
  to 
  Glossina 
  palpalis. 
  

  

  Host. 
  

  

  No. 
  of 
  hours 
  exposed. 
  

  

  No. 
  of 
  bites 
  inflicted. 
  

  

  No. 
  of 
  bites 
  per 
  hour. 
  

  

  Varanus 
  

  

  Crocodile 
  

  

  Goat 
  

  

  2 
  

   4 
  

  

  98 
  

  

  40 
  

  

  3 
  

  

  49-0 
  

  

  22-8 
  

  

  •7 
  

  

  The 
  comparison 
  between 
  Varanus 
  and 
  goat 
  is 
  believed 
  to 
  be 
  a 
  fair 
  one. 
  That 
  

   between 
  Varanus 
  and 
  Crocodile 
  is 
  not 
  so 
  fair, 
  because 
  of 
  the 
  small 
  size 
  and 
  greater 
  

   activity 
  of 
  the 
  crocodile. 
  Both 
  are 
  favoured 
  hosts, 
  and 
  about 
  equally 
  so. 
  

  

  3. 
  Comparison 
  between 
  Ox, 
  Sheep 
  and 
  Varanus. 
  

  

  This 
  experiment 
  was 
  conducted 
  in 
  April 
  1915 
  on 
  the 
  Peninsula 
  of 
  Nubiru, 
  on 
  

   the 
  mainland. 
  Two 
  native 
  sheep, 
  both 
  full-grown, 
  were 
  used, 
  and 
  three 
  young 
  

   bulls 
  about 
  half-grown. 
  One 
  of 
  these 
  was 
  an 
  apparently 
  pure-blooded 
  Ankole 
  

   (Bos 
  aegypticus) 
  ; 
  the 
  second 
  was 
  of 
  a 
  strongly 
  marked 
  zebu 
  or 
  Indian 
  type, 
  with 
  

   fully 
  developed 
  hump 
  and 
  other 
  characteristics 
  ; 
  the 
  third 
  had 
  the 
  outward 
  appear- 
  

   ance 
  of 
  some 
  nondescript 
  European 
  breed, 
  and 
  was 
  probably 
  a 
  half-breed. 
  Special 
  

   care 
  was 
  used 
  to 
  expose 
  the 
  various 
  animals 
  as 
  equally 
  as 
  possible. 
  The 
  results 
  

   are 
  summarised 
  in 
  Table 
  XXIV. 
  

  

  Table 
  XXIV. 
  

   The 
  Relative 
  Attractiveness 
  of 
  Varanus, 
  Sheep 
  and 
  Ox 
  to 
  Glossina 
  palpalis. 
  

  

  Host. 
  

  

  No. 
  of 
  hours 
  exposed 
  

  

  No. 
  of 
  bites 
  inflicted. 
  

  

  No. 
  of 
  bites 
  per 
  hour. 
  

  

  Varanus 
  

   Ankole 
  Bull.. 
  

   Indian 
  „ 
  . 
  . 
  

   Half-breed 
  „ 
  . 
  . 
  

   Sheep 
  No. 
  1 
  . 
  . 
  

   „ 
  No. 
  2 
  . 
  . 
  

  

  4 
  

   11 
  

   11 
  

   11 
  

   11 
  

   11 
  

  

  29 
  

  

  32 
  

  

  1 
  

  

  20 
  

   1 
  

   

  

  7-1 
  

   2'9 
  

  

  •1 
  

   1-7 
  

  

  •1 
  

  

  •o 
  

  

  Infestation 
  by 
  fly 
  in 
  this 
  locality 
  was, 
  at 
  this 
  time 
  : 
  — 
  Male 
  density 
  5*3 
  ; 
  female 
  

   percentage 
  41*2. 
  

  

  There 
  were 
  two 
  extraordinary 
  features 
  of 
  this 
  experiment, 
  one 
  of 
  which 
  is 
  brought 
  

   out 
  in 
  the 
  table 
  above 
  : 
  the 
  immunity 
  of 
  the 
  Indian 
  bull 
  to 
  attack 
  as 
  compared 
  with 
  

   the 
  Ankole 
  and 
  half-breed. 
  This 
  was 
  entirely 
  due 
  to 
  his 
  very 
  excitable 
  tempera- 
  

   ment. 
  He 
  was 
  intractable, 
  and 
  perhaps 
  a 
  bit 
  dangerous, 
  and 
  became 
  almost 
  as 
  

   excited 
  under 
  attack 
  by 
  Glossina 
  as 
  the 
  sheep, 
  which 
  were 
  even 
  more 
  intolerant 
  of 
  

   fly 
  than 
  the 
  goats 
  used 
  in 
  previous 
  experiments. 
  The 
  Ankole, 
  on 
  the 
  other 
  extreme, 
  

   was 
  absolutely 
  tractable 
  and 
  docile, 
  and 
  refused 
  to 
  become 
  annoyed 
  at 
  the 
  attack 
  

   of 
  either 
  Glossina 
  or 
  Stomoxys, 
  and 
  the 
  half-breed 
  was 
  not 
  much 
  different. 
  Both 
  

   these 
  animals 
  were 
  covered 
  with 
  ticks, 
  but 
  the 
  Indian 
  would 
  not 
  permit 
  even 
  these 
  

   pests, 
  and 
  by 
  remarkable 
  contortions 
  succeeded 
  in 
  freeing 
  himself 
  of 
  them 
  on 
  nearly 
  

   every 
  part 
  of 
  his 
  body. 
  

  

  