﻿FOUND 
  ON 
  RATS 
  IN 
  EGYPT. 
  

  

  223 
  

  

  (linear) 
  platelets 
  can 
  sometimes 
  be 
  distinguished 
  on 
  each 
  side 
  of 
  this 
  shield, 
  but 
  they 
  

   are 
  difficult 
  to 
  see. 
  Posterior 
  dorsal 
  shield 
  minute 
  and 
  without 
  any 
  hairs 
  on 
  its 
  sur- 
  

   face 
  ; 
  its 
  outline 
  presents 
  a 
  close 
  resemblance 
  to 
  a 
  butterfly, 
  four 
  lobes 
  or 
  wings 
  

   being 
  visible. 
  Sternal 
  plate 
  very 
  much 
  wider 
  than 
  long 
  and 
  with 
  only 
  two 
  pairs 
  of 
  

   hairs 
  ; 
  immediately 
  behind 
  it, 
  however, 
  there 
  is 
  a 
  pair 
  of 
  small 
  but 
  distinct 
  platelets, 
  

   each 
  of 
  which 
  bears 
  a 
  very 
  long 
  fine 
  hair 
  similar 
  to 
  those 
  on 
  the 
  sternal 
  plate. 
  Genito- 
  

   ventral 
  plate 
  narrow 
  and 
  long, 
  projecting 
  far 
  beyond 
  the 
  last 
  coxae, 
  and 
  its 
  posterior 
  

  

  Fig. 
  9. 
  Dermanyssus 
  aegyptius, 
  Hirst, 
  $ 
  ; 
  ventral 
  and 
  dorsal 
  aspects. 
  

  

  end 
  sharply 
  pointed 
  ; 
  it 
  is 
  furnished 
  with 
  the 
  usual 
  pair 
  of 
  hairs. 
  On 
  each 
  side 
  of 
  

   this 
  plate 
  there 
  are 
  two 
  very 
  narrow 
  elongated 
  platelets 
  as 
  in 
  D. 
  muris, 
  but 
  they 
  are 
  

   very 
  inconspicuous. 
  There 
  is 
  also 
  a 
  pair 
  of 
  platelets 
  behind 
  each 
  of 
  the 
  coxae 
  of 
  

   the 
  last 
  pair 
  of 
  legs. 
  Anal 
  plate 
  long 
  oval 
  in 
  shape. 
  Peritreme 
  extending 
  about 
  as 
  

   as 
  far 
  forwards 
  as 
  the 
  middle 
  of 
  the 
  coxa 
  of 
  the 
  second 
  leg. 
  Legs 
  more 
  slender 
  than 
  

   is 
  the 
  case 
  in 
  D. 
  muris. 
  Anterior 
  surface 
  of 
  coxa 
  of 
  second 
  leg 
  without 
  a 
  spur. 
  Length 
  

   of 
  body 
  (gorged 
  specimen), 
  1*9 
  mm. 
  

  

  