﻿54 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  NECTOMYS 
  ALFARI 
  ESMERALDARUM 
  Thomas 
  

  

  Nectoniys 
  csmeraldarum 
  Thomas, 
  Aim. 
  Mag. 
  Nat. 
  Hi.st., 
  ser. 
  7, 
  vol. 
  8, 
  p. 
  250, 
  1901 
  

  

  (type 
  locality, 
  San 
  Javier, 
  Esineraldas, 
  northwestern 
  Ecuador). 
  

   Nectomys 
  alfari 
  csmeraldarum, 
  Hershkovitz, 
  Mus. 
  Zool. 
  Univ. 
  Michigan 
  Misc. 
  

  

  Publ. 
  No. 
  58, 
  p. 
  78, 
  1944 
  (Ecuador: 
  San 
  Javier, 
  Esmeraldas; 
  Carolina, 
  Rio 
  

  

  Mira, 
  Imbabura). 
  

   Oryzomys 
  barbacoas 
  J. 
  A. 
  Allen, 
  Bull. 
  Amer. 
  Mus. 
  Nat. 
  Hist., 
  vol. 
  35, 
  p. 
  85, 
  1916 
  

  

  (type 
  locality, 
  Barbacoas, 
  Nariiio, 
  southvpestern 
  Colombia). 
  

   Orysomys 
  barbacoas 
  ochrinus 
  Thomas, 
  Ann. 
  Mag. 
  Nat. 
  Hist., 
  ser. 
  9, 
  vol. 
  7, 
  p. 
  449, 
  

  

  1921 
  (type 
  locality, 
  Ecuador, 
  west 
  of 
  Quito). 
  

  

  The 
  characters 
  of 
  the 
  subgenus 
  Sig7nodo7itomys 
  with 
  its 
  only 
  species, 
  

   Nectomys 
  alfari-^ 
  are 
  such 
  that 
  its 
  identification 
  with 
  Oryzomys 
  ^ 
  is 
  

   not 
  surprising. 
  It 
  will 
  be 
  recalled 
  that 
  Allen 
  had 
  previously 
  described 
  

   a 
  member 
  of 
  his 
  own 
  Sigmodontomys 
  as 
  Oryzomys 
  ochraceus. 
  

   Thomas, 
  after 
  describing 
  russulus 
  and 
  esmeraldarum 
  and 
  deliberat- 
  

   ing 
  largely 
  upon 
  the 
  characters 
  and 
  relationships 
  of 
  all 
  known 
  species 
  

   ot 
  Nectomys, 
  regarded 
  ochrinus 
  as 
  "quite 
  unlike 
  anything 
  in 
  the 
  British 
  

   Museum 
  collection." 
  The 
  type 
  and 
  topotype 
  of 
  harhacoas 
  Allen 
  are 
  

   near 
  enough, 
  both 
  geographically 
  and 
  in 
  their 
  characters, 
  to 
  be 
  assigned 
  

   to 
  esmeraldarum. 
  The 
  type 
  of 
  ochrinus 
  is 
  more 
  ochraceous 
  than 
  that 
  

   of 
  esmeraldarum, 
  and 
  quite 
  like 
  the 
  specimens 
  recorded 
  by 
  the 
  writer 
  

   {op. 
  cit.) 
  from 
  Carolina, 
  Kio 
  Mira, 
  Ecuador. 
  The 
  original 
  specimen 
  

   of 
  ochrinus 
  "collected" 
  by 
  Soderstrom 
  from 
  "west 
  of 
  Quito" 
  could 
  

   very 
  well 
  have 
  originated 
  in 
  the 
  Kio 
  Mira 
  region 
  on 
  the 
  western 
  slope 
  

   of 
  the 
  Cordillera 
  Occidental. 
  

  

  The 
  type 
  of 
  esmeraldarum 
  is 
  a 
  young 
  adult. 
  Its 
  cranial 
  measure- 
  

   ments 
  are 
  given, 
  followed 
  by 
  those 
  of 
  the 
  type 
  of 
  ochrinus; 
  condylo- 
  

   basal 
  length, 
  31.7, 
  31.9; 
  zygomatic 
  breadth, 
  17.9,-; 
  length 
  of 
  nasals, 
  

   13.9, 
  13.7 
  ; 
  width 
  across 
  parietal 
  ridges, 
  12.0, 
  12.2 
  ; 
  alveolar 
  length 
  of 
  

   molar 
  row, 
  5.2, 
  6.0; 
  interparietal, 
  2.9X7.9, 
  3.8X8.7 
  mm. 
  

  

  THE 
  STATUS 
  OF 
  "NECTOMYS" 
  DIMIDIATUS 
  AND 
  OF 
  "NECTOMYS" 
  

  

  HAMMONDI 
  

  

  Of 
  the 
  three 
  species 
  previously 
  listed 
  in 
  the 
  ^Hncertae 
  sedis^^ 
  group 
  

   (Hershkovitz, 
  1944, 
  pp. 
  21, 
  80), 
  one, 
  Nectomys 
  saturatus, 
  is 
  shown 
  

   above 
  to 
  be 
  a 
  race 
  of 
  squamipes. 
  The 
  other 
  two, 
  dimidiatUrS 
  and 
  

   ham7nondi, 
  are 
  very 
  different 
  from 
  each 
  other 
  and 
  from 
  Nectomys. 
  

   Examination 
  of 
  the 
  types, 
  the 
  only 
  known 
  specimens, 
  reveals 
  them 
  to 
  

   be 
  specially 
  marked 
  members 
  of 
  the 
  genus 
  Oryzomys 
  neither 
  of 
  which 
  

   is 
  assignable 
  to 
  any 
  known 
  superspecific 
  group. 
  Each 
  represents 
  a 
  

  

  * 
  It 
  may 
  be 
  better 
  to 
  regard 
  Sigmodontomys 
  as 
  a 
  subgenus 
  of 
  Oryzomys. 
  Likewise, 
  most 
  

   of 
  the 
  oryzomyine 
  rodents, 
  including 
  Nectomys, 
  Oecomys, 
  Oligoryzomys, 
  Microrysomys, 
  

   Melanomys, 
  Nesoryzomys, 
  and 
  Megalomys, 
  can 
  be 
  incorporated 
  with 
  Oryzomys 
  as 
  subgenera, 
  

   Pending 
  further 
  revisionary 
  work, 
  however, 
  it 
  is 
  convenient 
  to 
  follow 
  the 
  earlier 
  

   classifications. 
  

  

  