﻿198 
  PROCEEDINOS 
  OF 
  THE 
  ?fATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  This 
  species 
  is 
  large 
  and 
  fairly 
  common 
  in 
  the 
  gill 
  cavities 
  of 
  the 
  

   little 
  sheepsheads. 
  But 
  it 
  is 
  noticeably 
  sluggish 
  in 
  its 
  movements 
  

   and 
  never 
  leaves 
  the 
  fish 
  on 
  the 
  death 
  of 
  the 
  latter. 
  On 
  bemg 
  re- 
  

   moved 
  and 
  placed 
  in 
  an 
  aquarium, 
  it 
  swims 
  but 
  little, 
  attaching 
  

   itself 
  to 
  one 
  spot 
  and 
  remaining 
  there 
  for 
  a 
  long 
  time. 
  Even 
  the 
  

   male 
  is 
  not 
  active, 
  and 
  in 
  contrast 
  with 
  other 
  species 
  appears 
  very 
  

   slow 
  and 
  lazy. 
  

  

  BOMOLOCHUS 
  ATTENUATUS, 
  new 
  species. 
  

   Plate 
  21. 
  

  

  Host 
  and 
  record 
  of 
  specimens 
  . 
  — 
  Three 
  females, 
  two 
  of 
  which 
  carried 
  

   external 
  egg-strings, 
  were 
  taken 
  in 
  company 
  with 
  Artacolax 
  palleucus 
  

   on 
  the 
  gills 
  of 
  the 
  so-called 
  "poison 
  grouper," 
  really 
  one 
  of 
  the 
  scor- 
  

   pion 
  fishes, 
  Scorpsena 
  plumieri, 
  August 
  6, 
  1910. 
  

  

  Type-specimen. 
  — 
  Cat. 
  No. 
  43511, 
  U.S.N.^NI. 
  Paratypes, 
  Cat. 
  No. 
  

   42266, 
  U.S.N.M. 
  

  

  Female. 
  — 
  General 
  body 
  form 
  very 
  elongate 
  and 
  slender; 
  cephalo- 
  

   thorax 
  semielliptical, 
  two-thirds 
  wider 
  than 
  long, 
  with 
  almost 
  regu- 
  

   lar 
  curvature; 
  eye 
  small 
  and 
  close 
  to 
  the 
  frontal 
  margin. 
  

  

  Second 
  thorax 
  segment 
  short, 
  one-seventh 
  narrower 
  than 
  the 
  cepha- 
  

   lo 
  thorax; 
  tliird 
  segment 
  longer 
  and 
  three-quarters 
  as 
  wide 
  as 
  the 
  

   second; 
  fourth 
  segment 
  only 
  half 
  the 
  length 
  and 
  width 
  of 
  the 
  third; 
  

   fifth 
  segment 
  as 
  long 
  as 
  the 
  third 
  and 
  one-fifth 
  narrower 
  than 
  the 
  

   fourth, 
  formed 
  into 
  a 
  sort 
  of 
  neck 
  anteriorly 
  and 
  posteriorly. 
  Genital 
  

   segment 
  barrel-shaped, 
  the 
  same 
  width 
  as 
  the 
  fifth 
  segment 
  and 
  twice 
  

   as 
  long. 
  

  

  Abdomen 
  nearly 
  as 
  long 
  as 
  the 
  free 
  thorax 
  and 
  genital 
  segment 
  

   together, 
  three-jointed, 
  the 
  joints 
  diminishing 
  a 
  little 
  in 
  length 
  and 
  

   width; 
  anal 
  laminae 
  twice 
  as 
  long 
  as 
  wide, 
  and 
  two-thirds 
  the 
  length 
  

   of 
  the 
  last 
  segment, 
  with 
  square 
  corners. 
  Each 
  is 
  tipped 
  with 
  a 
  long 
  

   inner 
  seta, 
  an 
  outer 
  one 
  half 
  as 
  long, 
  a 
  short 
  spine 
  at 
  the 
  outer 
  distal 
  

   corner, 
  and 
  another 
  at 
  the 
  center 
  of 
  the 
  outer 
  margin. 
  

  

  Egg-strings 
  remarkably 
  long 
  and 
  slender 
  for 
  this 
  genus, 
  as 
  long 
  as 
  

   the 
  entire 
  body 
  and 
  the 
  same 
  width 
  as 
  the 
  basal 
  abdomen 
  segment, 
  

   which 
  makes 
  them 
  11 
  times 
  as 
  long 
  as 
  wide; 
  eggs 
  large, 
  arranged 
  in 
  

   four 
  longitudinal 
  rows, 
  from 
  25 
  to 
  27 
  in 
  a 
  row. 
  

  

  First 
  antennae 
  very 
  long 
  and 
  slender, 
  the 
  basal 
  portion 
  only 
  shghtly 
  

   enlarged 
  and 
  not 
  much 
  curved, 
  but 
  carrying 
  two 
  long 
  tactile 
  setse, 
  

   and 
  the 
  usual 
  large 
  plumose 
  seta 
  at 
  the 
  distal 
  end, 
  pointing 
  back- 
  

   ward. 
  

  

  Second 
  antennae 
  large 
  and 
  stout, 
  the 
  terminal 
  joint 
  tipped 
  with 
  a 
  

   long 
  finger 
  process 
  at 
  the 
  posterior 
  ventral 
  corner, 
  a 
  shorter 
  one 
  at 
  

   the 
  anterior 
  ventral 
  corner, 
  with 
  two 
  long 
  and 
  strongly 
  curved 
  claws 
  

   between 
  them, 
  and 
  a 
  larger 
  curved 
  claw 
  arising 
  from 
  the 
  dorsal 
  sur- 
  

  

  