﻿34 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  98 
  

  

  ADENOPS, 
  new 
  genus 
  

   FiGLTEES 
  4e, 
  5d 
  

  

  Genotype. 
  — 
  Adenops 
  anaJis, 
  new 
  species. 
  

  

  This 
  new 
  genus 
  has 
  the 
  premaxillary 
  dilated 
  posteriorly; 
  pre- 
  

   maxillary 
  or 
  gape 
  of 
  mouth 
  a 
  little 
  concave 
  at 
  side 
  ; 
  rictus 
  restricted 
  

   by 
  a 
  membrane 
  folding 
  between 
  jaws; 
  dentigerous 
  surface 
  of 
  pre- 
  

   maxillaries 
  not 
  reflected 
  outward 
  and 
  covering 
  face 
  of 
  that 
  bone 
  

   with 
  "shagreen"; 
  two 
  dorsal 
  fins 
  present; 
  silvery 
  lateral 
  band 
  pres- 
  

   ent 
  ; 
  mouth 
  small, 
  the 
  maxillary 
  not 
  reaching 
  to 
  eye 
  ; 
  air 
  bladder 
  and 
  

   body 
  cavity 
  not 
  reaching 
  anywhere 
  near 
  to 
  opposite 
  anal 
  fin 
  origin; 
  

   first 
  dorsal 
  origin 
  notably 
  in 
  front 
  of 
  anal 
  origin; 
  pelvic 
  insertions 
  

   equidistant 
  or 
  closer 
  to 
  opercular 
  margins 
  or 
  upper 
  angle 
  of 
  pectoral 
  

   fin 
  base 
  than 
  to 
  anal 
  origin 
  ; 
  about 
  five 
  or 
  six 
  scales 
  forming 
  a 
  sheath 
  

   anteriorly 
  along 
  base 
  of 
  anal 
  fin 
  ; 
  margin 
  of 
  scales 
  entire 
  or 
  crenulate 
  ; 
  

   distal 
  margins 
  of 
  dorsal 
  and 
  anal 
  fins 
  concave 
  ; 
  ascending 
  process 
  of 
  

   premaxillary 
  a 
  narrow-based 
  elongate 
  spinelike 
  projection 
  ; 
  vertebrae 
  

   14 
  to 
  16 
  + 
  22 
  to 
  26. 
  

  

  Other 
  characters 
  are 
  those 
  of 
  the 
  genotype. 
  The 
  genus 
  differs 
  

   from 
  all 
  other 
  genera 
  of 
  the 
  family 
  except 
  Mernbras 
  and 
  Thyrinops 
  

   by 
  having 
  four 
  shallow 
  glandlike 
  depressions 
  on 
  the 
  dorsal 
  surface 
  

   of 
  the 
  snout. 
  From 
  Mernbras 
  it 
  differs 
  in 
  having 
  the 
  anus 
  near 
  the 
  

   middle 
  of 
  the 
  distance 
  between 
  anal 
  origin 
  and 
  the 
  pelvic 
  bases, 
  

   instead 
  of 
  a 
  little 
  in 
  front 
  of 
  anal 
  origin, 
  and 
  in 
  having 
  fewer 
  abdom- 
  

   inal 
  vertebrae, 
  14 
  to 
  16 
  instead 
  of 
  18 
  to 
  20. 
  It 
  may 
  be 
  separated 
  

   from 
  other 
  Atherinidae 
  by 
  the 
  characters 
  given 
  in 
  the 
  key. 
  In 
  

   Thyrinops 
  the 
  air 
  bladder 
  extends 
  some 
  distance 
  past 
  the 
  anal-fin 
  

   origin. 
  

  

  The 
  only 
  other 
  American 
  atherine 
  fish 
  with 
  the 
  posterior 
  end 
  of 
  

   the 
  premaxillary 
  dilated 
  that 
  has 
  the 
  anus 
  far 
  forward 
  is 
  Archomen- 
  

   idia 
  sallei 
  (Regan) 
  , 
  but 
  in 
  this 
  genus 
  the 
  body 
  cavity 
  and 
  air 
  bladder 
  

   extend 
  conspicuously 
  some 
  distance 
  past 
  the 
  anal-fin 
  origin. 
  

  

  Named 
  Adenops 
  in 
  reference 
  to 
  the 
  four 
  depressions 
  on 
  the 
  dorsal 
  

   surface 
  of 
  snout, 
  which 
  appear 
  to 
  be 
  glandular. 
  

  

  ADENOPS 
  ANALIS, 
  new 
  species 
  

   FiGUKE 
  6 
  

  

  Holotype. 
  — 
  U. 
  S. 
  N. 
  M. 
  No. 
  121824, 
  a 
  specimen 
  59 
  mm. 
  in 
  standard 
  

   length, 
  collected 
  by 
  Leonard 
  P. 
  Schultz 
  at 
  night 
  by 
  flashlight 
  in 
  Lago 
  

   daMaracaibo, 
  1 
  km. 
  off 
  Pueblo 
  Viejo, 
  Venezuela, 
  on 
  April 
  7-8, 
  1942. 
  

  

  Parafypes.—V. 
  S. 
  N. 
  M. 
  No. 
  121823, 
  66 
  specimens, 
  9 
  to 
  53.5 
  mm. 
  in 
  

   standard 
  length, 
  taken 
  along 
  with 
  the 
  holotype 
  and 
  bearing 
  same 
  

   data. 
  There 
  appear 
  to 
  be 
  at 
  least 
  two 
  age 
  groups 
  in 
  this 
  lot, 
  with 
  

   25 
  specimens 
  9 
  to 
  17.5 
  and 
  41 
  specimens 
  19.5 
  to 
  53.5 
  mm. 
  

  

  