﻿FOUND 
  ON 
  RATS 
  IN 
  EGYPT. 
  221 
  

  

  enlarged 
  anal 
  portion 
  ; 
  eight 
  pairs 
  of 
  hairs 
  and 
  the 
  usual 
  unpaired 
  posterior 
  hair 
  are 
  

   present 
  on 
  this 
  plate. 
  Peritreme 
  rather 
  short, 
  apparently 
  not 
  reaching 
  as 
  far 
  forwards 
  

   as 
  the 
  middle 
  of 
  the 
  second 
  coxa 
  (?), 
  but 
  its 
  supporting 
  plate 
  proceeds 
  a 
  little 
  further 
  

   forwards. 
  Tarsi 
  of 
  third 
  and 
  fourth 
  legs 
  long 
  and 
  slender 
  ; 
  the 
  conical 
  projection 
  

   on 
  their 
  ventral 
  surface 
  is 
  situated 
  in 
  practically 
  the 
  same 
  position 
  as 
  in 
  D. 
  muris. 
  

   Chelicera 
  closely 
  resembling 
  that 
  of 
  D. 
  muris, 
  a 
  long 
  accessory 
  flagellum 
  being 
  

   present. 
  Length 
  of 
  body, 
  '7 
  mm. 
  

  

  Fig. 
  7. 
  Ventral 
  view 
  of 
  deutonymph 
  of 
  

   Dermanyssus 
  sanguineus, 
  Hirst. 
  

  

  Deutonymph. 
  Dorsal 
  shields 
  very 
  similar 
  to 
  those 
  of 
  the 
  female. 
  A 
  small 
  circular 
  

   or 
  sub-circular 
  platelet 
  is 
  situated 
  above 
  the 
  interval 
  between 
  the 
  first 
  and 
  second 
  

   legs. 
  Sternal 
  plate 
  projecting 
  backwards 
  well 
  beyond 
  the 
  last 
  coxae 
  and 
  its 
  end 
  

   rather 
  sharply 
  pointed 
  ; 
  it 
  has 
  four 
  pairs 
  of 
  hairs 
  on 
  it. 
  Immediately 
  behind 
  the 
  

   sternal 
  plate, 
  there 
  are 
  three 
  pairs 
  of 
  very 
  minute 
  and 
  inconspicuous 
  platelets. 
  A 
  

   pair 
  of 
  platelets 
  placed 
  close 
  together 
  are 
  also 
  present 
  just 
  behind 
  each 
  of 
  the 
  last 
  

   coxae. 
  Peritreme 
  short, 
  the 
  tubular 
  part 
  of 
  it, 
  apparently, 
  only 
  reaching 
  a 
  little 
  in 
  

   front 
  of 
  the 
  third 
  coxa, 
  but 
  it 
  is 
  continued 
  forwards 
  by 
  its 
  chitinous 
  shield, 
  which 
  

   almost 
  reaches 
  the 
  middle 
  of 
  the 
  second 
  coxa. 
  Length 
  of 
  body, 
  '7 
  mm. 
  

  

  