﻿[21] 
  CATALOGUE 
  OF 
  THE 
  FISHES 
  OF 
  NORTH 
  AMERICA. 
  809 
  

  

  75.— 
  DIONDA 
  1 
  Girard. 
  (77 
  pt.) 
  

  

  206. 
  Dionda 
  melanops 
  Girarcl. 
  Vsw. 
  (189) 
  

  

  207. 
  Dionda 
  punctifera 
  Garman. 
  Vsw. 
  (1886.) 
  

  

  208. 
  Dionda 
  fluviatilis 
  Girard. 
  Vsw. 
  (188) 
  

  

  209. 
  Dionda 
  amara 
  Girard. 
  Vsw. 
  (183) 
  

  

  210. 
  Dionda 
  episcopa 
  2 
  Girard. 
  Vsw. 
  (184,187) 
  

  

  211. 
  Dionda 
  serena 
  3 
  Girard. 
  Vsw. 
  (185) 
  

  

  212. 
  Dionda 
  uubila 
  4 
  Forbes. 
  Vw. 
  (206) 
  

  

  213. 
  Dionda 
  (?) 
  haematura 
  5 
  Cope. 
  Vn. 
  ('204) 
  

  

  76.— 
  HYBOGNATHUS 
  Agassiz. 
  (78) 
  

  

  214. 
  Hybognathus 
  meeki" 
  Jordan 
  & 
  Gilbert. 
  Vw. 
  

  

  215. 
  Hybognathus 
  argyritis 
  7 
  Girard. 
  Vnw. 
  

  

  216. 
  Hybognathus 
  nuchalis 
  8 
  Agassiz. 
  V. 
  (182) 
  

   216 
  b. 
  Hybognathus 
  nuchalis 
  placita 
  9 
  Girard. 
  Vw. 
  (186) 
  

  

  1 
  The 
  genus 
  Dionda 
  may 
  perhaps 
  be 
  recognized 
  as 
  distinct 
  from 
  Hybognathus. 
  Its 
  

   teeth 
  are 
  shorter 
  than 
  those 
  of 
  Hybognathus, 
  and 
  more 
  or 
  less 
  distinctly 
  hooked. 
  The 
  

   species 
  are 
  small 
  in 
  size 
  and 
  mostly 
  dusky 
  in 
  coloration, 
  being 
  especially 
  character- 
  

   istic 
  of 
  the 
  Rio 
  Grande 
  region. 
  

  

  - 
  Dionda 
  episcopa 
  Girard, 
  Dionda 
  texensis 
  Girard, 
  Dionda 
  argentosa 
  Girard 
  (types 
  of 
  

   these 
  three 
  examined 
  by 
  us) 
  = 
  Hybognathus 
  flavipinnis 
  Copo. 
  Fairly 
  described 
  in 
  the 
  

   Synopsis 
  under 
  the 
  name 
  of 
  Hybognathus 
  flavipinnis. 
  The 
  number 
  of 
  scales 
  in 
  the 
  lateral 
  

   line 
  is 
  about 
  37 
  in 
  the 
  types 
  of 
  episcopa 
  and 
  argentosa, 
  37 
  to 
  39 
  in 
  texensis, 
  and 
  41 
  in 
  

   flavipinnis. 
  The 
  anterior 
  suborbitals 
  are 
  of 
  moderate 
  width 
  in 
  D. 
  episcopa, 
  about 
  as 
  

   in 
  Hybognathus 
  nuchalis. 
  

  

  3 
  Dionda 
  serena 
  Girard 
  = 
  Dionda 
  chrysilis 
  Grd. 
  = 
  Hybognathus 
  nigrotwniaius 
  Cope. 
  

   Fairly 
  described 
  in 
  the 
  Synopsis 
  under 
  the 
  latter 
  name. 
  The 
  eye 
  is 
  smaller 
  in 
  serena 
  

   than 
  in 
  episcopa, 
  and 
  the 
  scales 
  are 
  larger 
  (34 
  in 
  the 
  typo 
  of 
  D. 
  serena). 
  

  

  ■* 
  Described 
  in 
  the 
  Synopsis, 
  page 
  1G7, 
  as 
  Cliolanubila. 
  The 
  species 
  belongs, 
  how- 
  

   ever, 
  to 
  Dionda, 
  as 
  has 
  been 
  already 
  noticed 
  by 
  Professor 
  Forbes. 
  D. 
  7iubila 
  is 
  very 
  

   close 
  to 
  D. 
  episcopa, 
  but 
  from 
  the 
  specimens 
  compared 
  it 
  appears 
  to 
  differ 
  from 
  the 
  

   latter 
  in 
  the 
  more 
  pointed 
  snout 
  and 
  in 
  the 
  larger 
  mouth, 
  the 
  cleft 
  of 
  the 
  mouth 
  form- 
  

   ing 
  about 
  one-fourth 
  the 
  leugth 
  of 
  the 
  head, 
  instead 
  of 
  one-lifth, 
  as 
  in 
  D. 
  episcopa. 
  

  

  °A 
  doubtful 
  species, 
  unknown 
  to 
  me. 
  The 
  description 
  points 
  rather 
  to 
  this 
  genus 
  

   or 
  Cliola, 
  than 
  to 
  Notropis. 
  

  

  '■ 
  Hybognathus 
  meelci 
  Jordan 
  & 
  Gilbert, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  1885. 
  Ozark 
  region 
  of 
  

   Missouri 
  and 
  Arkansas; 
  abundant. 
  

  

  7 
  The 
  types 
  of 
  Hybognathus 
  argyritis 
  from 
  the 
  Upper 
  Missouri 
  belong 
  to 
  a 
  species 
  

   distinct 
  from 
  H. 
  nuchalis, 
  and 
  are 
  distinct 
  from 
  the 
  species 
  heretofore 
  called 
  H. 
  argyritis 
  

   by 
  different 
  authors. 
  The 
  suborbitals 
  in 
  H. 
  argyritis 
  are 
  broad, 
  as 
  in 
  H. 
  nuchalis 
  and 
  

   H. 
  placita, 
  the 
  anterior 
  being 
  about 
  twice 
  as 
  long 
  as 
  deep 
  ; 
  the 
  mouth 
  is 
  larger 
  than 
  

   in 
  the 
  other 
  species, 
  its 
  cleft 
  extending 
  nearly 
  to 
  the 
  eye; 
  the 
  jaws 
  subecpnal, 
  the 
  

   lower 
  being 
  acutish 
  at 
  tip. 
  The 
  species 
  is 
  known 
  only 
  from 
  the 
  Upper 
  Missouri 
  and 
  

   the 
  Red 
  River 
  of 
  the 
  North. 
  Hybognathus 
  evansi 
  Girard 
  is 
  possibly 
  the 
  same, 
  but 
  the 
  

   types 
  are 
  lost 
  and 
  the 
  description 
  is 
  too 
  brief 
  for 
  identification. 
  It 
  is 
  more 
  likely 
  H. 
  

   nuchajlis. 
  

  

  8 
  This 
  species 
  ranges 
  from 
  New 
  Jersey 
  to 
  South 
  Carolina, 
  Texas, 
  and 
  Dakota. 
  H. 
  

   osmerinus 
  and 
  H. 
  regius 
  being 
  indistinguishable 
  from 
  it. 
  It 
  has 
  the 
  suborbitals 
  broad, 
  

   the 
  mouth 
  small, 
  the 
  lower 
  jaw 
  short, 
  blunt, 
  and 
  subhorizontal, 
  and 
  the 
  eye 
  largo, 
  

   about 
  4 
  in 
  head. 
  

  

  s 
  ' 
  Hybognathus 
  placita, 
  now 
  known 
  from 
  the 
  Arkansas 
  and 
  Missouri 
  Rivers, 
  is 
  closely 
  

   related 
  to 
  H. 
  nuchalis, 
  but 
  has 
  the 
  eye 
  smaller, 
  about 
  5 
  in 
  head, 
  the 
  snout 
  depressed 
  

   and 
  rather 
  blunt 
  ; 
  mouth 
  very 
  small. 
  

  

  