﻿200 
  PROCEEDINOS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  TUCCA 
  IMPRESSUS 
  Kr^yer. 
  

  

  Tucca 
  impressus 
  Kr0yer, 
  1837, 
  p. 
  479, 
  pi. 
  5. 
  fig. 
  2a-f/. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  This 
  species 
  was 
  very 
  common 
  on 
  

   the 
  fins 
  of 
  the 
  various 
  puffers, 
  and 
  almost 
  every 
  fish 
  yielded 
  one 
  or 
  

   more 
  specimens 
  of 
  the 
  parasite. 
  Two 
  lots 
  were 
  taken 
  from 
  the 
  spiny- 
  

   backed 
  puffer, 
  Spheroides 
  rnarmoratus, 
  one 
  on 
  June 
  20, 
  the 
  other 
  on 
  

   September 
  15, 
  and 
  have 
  been 
  numbered, 
  respectively, 
  42265 
  and 
  

   42269, 
  U.S.N.M. 
  Two 
  other 
  lots 
  were 
  obtained 
  from 
  the 
  burr 
  fish, 
  

   Chilomycterus 
  antennatus, 
  one 
  on 
  June 
  15, 
  the 
  other 
  on 
  August 
  8. 
  

   These 
  include 
  by 
  far 
  the 
  larger 
  number 
  of 
  specimens 
  and 
  also 
  both 
  

   sexes 
  of 
  the 
  parasite, 
  and 
  have 
  been 
  numbered, 
  respectively, 
  42273 
  

   and 
  42251, 
  U.S.N.M. 
  

  

  A 
  single 
  lot 
  was 
  obtained 
  from 
  the 
  pectoral 
  fins 
  of 
  the 
  porcupine 
  

   fish, 
  Diodon 
  M/strlx, 
  and 
  has 
  received 
  Cat. 
  No. 
  42264, 
  U.S.N.M. 
  This 
  

   lot 
  contains 
  five 
  females. 
  

  

  Careful 
  search 
  was 
  made 
  on 
  these 
  porcupine 
  fishes 
  for 
  specimens 
  

   of 
  the 
  distinct 
  species 
  described 
  by 
  Nordmann 
  in 
  1864, 
  as 
  obtained 
  

   from 
  a 
  Diodon 
  species 
  on 
  the 
  west 
  coast 
  of 
  Africa, 
  and 
  to 
  which 
  the 
  

   present 
  author 
  has 
  elsewhere 
  given 
  the 
  name 
  verrucosus,^ 
  but 
  none 
  

   could 
  be 
  found. 
  

  

  In 
  evidence 
  that 
  the 
  habitat 
  of 
  these 
  (and 
  other) 
  parasites 
  is 
  exactly 
  

   restricted 
  to 
  certain 
  kinds 
  of 
  fish, 
  we 
  may 
  note 
  the 
  fact 
  that 
  although 
  

   this 
  species 
  was 
  so 
  common 
  on 
  all 
  the 
  puffers, 
  not 
  a 
  solitary 
  specimen 
  

   was 
  ever 
  found 
  on 
  any 
  of 
  the 
  trunk 
  fishes, 
  and 
  yet 
  the 
  latter 
  are 
  

   always 
  associated 
  with 
  the 
  puffers 
  and 
  are 
  very 
  similar 
  to 
  them 
  m 
  

   most 
  respects. 
  

  

  ARTACOLAX 
  PALLEUCUS, 
  new 
  species. 
  

   Plates 
  22 
  and 
  23. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  This 
  species 
  was 
  common 
  on 
  the 
  

   gills 
  of 
  the 
  "poison 
  grouper," 
  really 
  one 
  of 
  the 
  scorpion 
  fishes, 
  Scor- 
  

   psena 
  plumieri 
  Bloch. 
  

  

  Four 
  lots 
  of 
  specimens 
  were 
  obtained 
  from 
  this 
  fish, 
  on 
  June 
  17, 
  

   June 
  30, 
  July 
  20, 
  and 
  July 
  21, 
  1910. 
  These 
  have 
  received 
  respec- 
  

   tively 
  Cat. 
  Nos. 
  42272, 
  42324, 
  42252, 
  and 
  42254, 
  U.S.N.M. 
  

  

  Type-specimen.— 
  A 
  female, 
  Cat. 
  No. 
  43582, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  shape 
  resembling 
  a 
  tadpole, 
  with 
  a 
  large 
  and 
  

   highly 
  inflated 
  cephalothorax 
  and 
  a 
  long 
  and 
  slender 
  hind 
  body, 
  

   made 
  up 
  of 
  the 
  fifth 
  and 
  sixth 
  (genital) 
  thorax 
  segments 
  and 
  the 
  

   abdomen. 
  Head 
  and 
  first 
  thorax 
  segment 
  fully 
  fused; 
  second, 
  

   third, 
  and 
  fourth 
  segments 
  partially 
  fused 
  with 
  them 
  to 
  form 
  the 
  

   anterior 
  inflated 
  portion 
  of 
  the 
  body, 
  which 
  is 
  quite 
  regularly 
  oval 
  

   in 
  general 
  outline, 
  strongly 
  arched 
  dorsally, 
  and 
  filled 
  with 
  the 
  uter- 
  

  

  » 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  39, 
  19n, 
  p. 
  359. 
  

  

  