﻿NO. 
  1950. 
  CRUSTACEAN 
  PARASITES 
  OF 
  FISH 
  AND 
  CRABS— 
  WILSON. 
  193 
  

  

  FamUy 
  ARGULID^. 
  

  

  The 
  apparent 
  absence 
  of 
  this 
  family 
  from 
  the 
  fauna 
  of 
  Jamaica 
  is 
  

   worthj^ 
  of 
  comment. 
  Species 
  of 
  Argulus 
  have 
  been 
  obtained 
  from 
  

   Key 
  West, 
  Florida; 
  from 
  New 
  Orleans, 
  Louisiana; 
  from 
  Dallas, 
  

   Texas, 
  and 
  from 
  many 
  localities 
  in 
  Central 
  and 
  South 
  America. 
  

   These 
  include 
  both 
  salt 
  and 
  fresh 
  water 
  forms 
  and 
  show 
  that 
  in 
  the 
  

   surrounding 
  faunas, 
  which 
  most 
  resemble 
  that 
  of 
  Jamaica, 
  the 
  family 
  

   ArgulidtB 
  is 
  fau'ly 
  well 
  represented. 
  Hence 
  we 
  should 
  naturally 
  look 
  

   for 
  a 
  similar 
  representation 
  in 
  the 
  Jamaican 
  fauna, 
  and 
  it 
  seems 
  more 
  

   reasonable 
  to 
  suppose 
  that 
  the 
  failure 
  to 
  discover 
  any 
  member 
  of 
  this 
  

   family 
  on 
  the 
  fish 
  of 
  Jamaica 
  has 
  been 
  the 
  result 
  of 
  accident 
  rather 
  

   than 
  due 
  to 
  then- 
  entire 
  absence 
  from 
  the 
  region. 
  Careful 
  search 
  in 
  

   the 
  future 
  may 
  bring 
  to 
  light 
  some 
  Argulus 
  species, 
  but 
  a 
  similar 
  

   search 
  during 
  the 
  season 
  of 
  1910 
  was 
  unsuccessful. 
  

  

  FamUy 
  ERGASILID^. 
  

  

  ERGASILUS 
  LONGIPALPUS, 
  new 
  species. 
  

   Plate 
  18, 
  figs. 
  1-6. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  A 
  single 
  lot, 
  consisting 
  of 
  six 
  females, 
  

   was 
  taken 
  from 
  the 
  gills 
  of 
  several 
  puffers 
  {Chilomycterus 
  antennatus) 
  

   at 
  Montego 
  Bay, 
  June 
  6, 
  1910. 
  

  

  Type-specimen.— 
  Csii. 
  No. 
  43512, 
  U.S.N.M. 
  Paratypes, 
  Cat. 
  No. 
  

   42258, 
  U.S.N.M. 
  • 
  

  

  Female. 
  — 
  Cephalothorax 
  ovate, 
  one-fourth 
  longer 
  than 
  wide, 
  with 
  

   evenly 
  curved 
  lateral, 
  and 
  a 
  slightly 
  reentrant 
  posterior, 
  margin; 
  

   neither 
  dorsal 
  grooves 
  nor 
  eye 
  visible. 
  The 
  first 
  three 
  free 
  thorax 
  

   segments 
  the 
  same 
  length, 
  but 
  diminishing 
  regularly 
  in 
  width, 
  the 
  

   fij'st 
  one 
  (second 
  segment) 
  three-sevenths 
  the 
  width 
  of 
  the 
  carapace; 
  

   fifth 
  segment 
  indistinguishably 
  fused 
  with 
  the 
  genital 
  segment, 
  which 
  

   is 
  the 
  same 
  width 
  and 
  about 
  twice 
  the 
  length 
  of 
  the 
  fourth 
  segment. 
  

   Abdomen 
  two-thirds 
  the 
  width 
  of 
  the 
  genital 
  segment 
  and 
  made 
  up 
  

   of 
  three 
  joints 
  of 
  equal 
  length; 
  anal 
  laminae 
  small 
  and 
  circular, 
  each 
  

   tipped 
  vnih. 
  two 
  setae, 
  the 
  inner 
  of 
  which 
  is 
  twice 
  the 
  length 
  of 
  the 
  

   outer. 
  Egg-tubes 
  narrowed 
  posteriorly, 
  two-thirds 
  the 
  body 
  length; 
  

   eggs 
  small, 
  in 
  six 
  or 
  eight 
  longitudinal 
  rows, 
  about 
  20 
  eggs 
  in 
  a 
  row. 
  

  

  First 
  antennae 
  of 
  the 
  usual 
  pattern; 
  second 
  pair 
  with 
  moderately 
  

   enlarged 
  basal 
  joints 
  and 
  a 
  stout 
  terminal 
  claw, 
  bent 
  sharply 
  near 
  

   the 
  center 
  and 
  armed 
  there 
  with 
  a 
  rounded 
  protuberance 
  on 
  the 
  

   inner 
  margin. 
  

  

  Mandibles 
  with 
  a 
  ^lender 
  neck, 
  a 
  narrow 
  terminal 
  blade, 
  armed 
  

   with 
  setge 
  along 
  the 
  inner 
  border 
  only, 
  and 
  a 
  large 
  secondary 
  tuft 
  of 
  

   setae 
  at 
  the 
  inner 
  distal 
  corner 
  of 
  the 
  neck. 
  

  

  Mandibular 
  palps 
  exceptionally 
  long 
  and 
  narrow, 
  reaching 
  beyond 
  

   the 
  tip 
  of 
  the 
  basal 
  joint 
  almost 
  to 
  the 
  center 
  of 
  the 
  terminal 
  blade. 
  

   69077°— 
  Proc.N.M.vol.44— 
  13 
  13 
  

  

  