﻿FOUND 
  ON 
  RATS 
  IN 
  EGYPT. 
  229 
  

  

  Leiognathus 
  bacoti 
  is 
  apparently 
  closely 
  allied 
  to 
  L. 
  saurarum, 
  Oudms., 
  and 
  to 
  

   L. 
  musculinus, 
  C. 
  L. 
  Koch. 
  The 
  female 
  of 
  L. 
  saurarum 
  has 
  its 
  dorsal 
  shield 
  shaped 
  

   very 
  like 
  that 
  of 
  L. 
  bacoti, 
  but 
  the 
  hairs 
  on 
  it 
  are 
  differently 
  arranged, 
  only 
  a 
  single 
  

   pair 
  of 
  short 
  hairs 
  being 
  present 
  near 
  the 
  posterior 
  end 
  of 
  the 
  shield, 
  instead 
  of 
  several 
  

   rather 
  long 
  pairs 
  as 
  in 
  L. 
  bacoti. 
  The 
  protonymph 
  of 
  L. 
  musculinus 
  (as 
  figured 
  by 
  

   Oudemans, 
  Tijdschr. 
  Nederland. 
  Dierk. 
  Ver. 
  (2) 
  vii, 
  pi. 
  8, 
  figs. 
  19 
  and 
  20, 
  etc., 
  1902) 
  

   presents 
  a 
  very 
  close 
  resemblance 
  to 
  that 
  stage 
  of 
  L. 
  bacoti, 
  especially 
  as 
  regards 
  the 
  

   shape 
  of 
  the 
  little 
  posterior 
  dorsal 
  shield 
  and 
  the 
  number 
  of 
  hairs 
  on 
  it 
  ; 
  the 
  female 
  

   of 
  L. 
  musculinus 
  is 
  very 
  different, 
  however, 
  from 
  that 
  of 
  L. 
  bacoti, 
  being 
  furnished 
  

   with 
  two 
  dorsal 
  shields 
  instead 
  of 
  one. 
  

  

  5. 
  Laelaps 
  echidninus, 
  Berl. 
  

  

  Egypt 
  : 
  Assiut 
  ; 
  thirty-two 
  specimens 
  captured 
  on 
  Mus 
  norvegicus 
  and 
  three 
  

   on 
  Mus 
  rattus 
  alexandrinus 
  on 
  the 
  feluccas. 
  

   This 
  species 
  is 
  probably 
  cosmopolitan. 
  

  

  Family 
  Argasidae. 
  

  

  6. 
  Argus 
  persicus, 
  Fischer. 
  

  

  Egypt 
  : 
  Assiut 
  ; 
  a 
  nymph 
  and 
  two 
  larvae 
  found 
  on 
  Mus 
  rattus, 
  and 
  two 
  

   distended 
  larvae 
  found 
  on 
  Arvicanthis 
  niloticus 
  (in 
  houses). 
  

  

  7. 
  Ornithodorus 
  erraticus, 
  Lucas. 
  

  

  Egypt 
  : 
  Assiut 
  ; 
  about 
  fifty 
  specimens 
  (nymphs 
  and 
  larvae) 
  found 
  on 
  Mus 
  

   rattus, 
  and 
  a 
  nymph 
  and 
  a 
  larva 
  from 
  the 
  same 
  host 
  on 
  the 
  feluccas 
  ; 
  three 
  nymphs 
  

   and 
  six 
  larvae 
  from 
  Arvicanthis 
  niloticus. 
  El 
  Hasaiba, 
  Deimt 
  ; 
  three 
  nymphs 
  and 
  

   one 
  larva 
  from 
  M 
  us 
  rattus. 
  

  

  The 
  specimens 
  fisted 
  above 
  seemingly 
  belong 
  to 
  Ornithodoros 
  erraticus. 
  There 
  

   are 
  no 
  lateral 
  expansions 
  to 
  the 
  earner 
  ostome, 
  but 
  the 
  body 
  has 
  a 
  projection 
  above 
  

   the 
  mouth- 
  parts 
  as 
  in 
  0. 
  talaje 
  var. 
  capensis, 
  Nn. 
  Dorsal 
  surface 
  furnished 
  with 
  

   numerous 
  distinct 
  but 
  very 
  fine 
  granules 
  ; 
  discs 
  obsolete 
  or 
  absent. 
  Eyes 
  apparently 
  

   absent. 
  

  

  Family 
  Ixodidae. 
  

  

  8. 
  Rhipicephalus 
  sp. 
  

  

  Egypt 
  : 
  Assiut 
  ; 
  a 
  large 
  number 
  of 
  nymphs 
  and 
  larvae 
  from 
  Acomys 
  cahirinus 
  

   and 
  also 
  fifteen 
  from 
  Mus 
  rattus. 
  

  

  (C86) 
  

  

  