﻿A 
  NEW 
  SPECIES 
  OF 
  HOOKWORM 
  FROM 
  A 
  NORTH 
  

   AMERICAN 
  RACCOON 
  

  

  By 
  Benjamin 
  Schwartz 
  

  

  Of 
  the 
  Zoological 
  Division, 
  Bureau 
  of 
  Animal 
  Industry, 
  United 
  8 
  

   Department 
  of 
  Agriculture 
  

  

  In 
  the 
  course 
  of 
  a 
  post-mortem 
  examination 
  of 
  a 
  raccoon 
  (Procyon 
  

   lot 
  or) 
  that 
  was 
  captured 
  in 
  Prince 
  Georges 
  County, 
  Maryland, 
  on 
  

   February 
  7, 
  1925, 
  by 
  Dr. 
  W. 
  S. 
  Gochenour 
  of 
  the 
  Bureau 
  of 
  Animal 
  

   Industry, 
  a 
  number 
  of 
  hookworms 
  were 
  found 
  in 
  the 
  duodenum. 
  

   Associated 
  with 
  the 
  parasites 
  lesions 
  resembling 
  those 
  usually 
  pro- 
  

   duced 
  by 
  hookworms 
  were 
  observed 
  in 
  the 
  intestinal 
  mucosa. 
  

  

  Heretofore 
  three 
  species 
  of 
  hookworms 
  have 
  been 
  recorded 
  from 
  

   raccoons 
  of 
  the 
  genus 
  Procyon. 
  Molin 
  (1861) 
  has 
  described 
  Doch- 
  

   mius 
  bidens 
  and 
  D. 
  maxillaris 
  from 
  a 
  South 
  American 
  raccoon 
  

   {Procyon 
  cancrivorus) 
  . 
  These 
  species 
  were 
  transferred 
  to 
  the 
  genus 
  

   Uncinaria 
  by 
  Stossich 
  (1899). 
  Baylis 
  and 
  Daubney 
  (1923) 
  have 
  

   described 
  a 
  third 
  species, 
  Tetragomphius 
  procyonis 
  from 
  a 
  raccoon 
  

   (Procyon, 
  species) 
  at 
  the 
  Zoological 
  Garden, 
  Calcutta, 
  India. 
  These 
  

   authors 
  note 
  that 
  their 
  species 
  may 
  be 
  identical 
  with 
  one 
  of 
  Molin's 
  

   species 
  but 
  that 
  Molin's 
  descriptions 
  are 
  so 
  incomplete 
  that 
  the 
  

   species 
  are 
  unrecognizable. 
  Like 
  Baylis 
  and 
  Daubney 
  the 
  present 
  

   writer 
  has 
  been 
  forced 
  to 
  disregard 
  Molin's 
  species 
  because 
  the 
  im- 
  

   perfections 
  of 
  the 
  descriptions 
  make 
  recognition 
  impossible. 
  The 
  

   form 
  from 
  Procyon 
  lotor 
  is 
  therefore 
  considered 
  to 
  be 
  of 
  a 
  new 
  

   species. 
  For 
  this 
  species 
  the 
  name 
  Uncinaria 
  lotoris 
  is 
  proposed. 
  

  

  UNCINARIA 
  LOTORIS, 
  new 
  species 
  

  

  In 
  their 
  normal 
  location 
  on 
  the 
  mucosa 
  of 
  the 
  intestine 
  the 
  worms 
  

   were 
  considerably 
  twisted. 
  After 
  being 
  placed 
  in 
  hot 
  alcohol 
  they 
  

   straightened 
  out. 
  The 
  cuticle 
  is 
  very 
  finely 
  striated 
  transversely. 
  

   The 
  ventral 
  wall 
  of 
  the 
  mouth 
  capsule 
  presents 
  a 
  moderate 
  curvature 
  

   when 
  viewed 
  from 
  the 
  side 
  (fig. 
  1). 
  The 
  mouth 
  capsule 
  is 
  consider- 
  

   ably 
  longer 
  than 
  broad, 
  its 
  actual 
  size 
  varying 
  in 
  different 
  specimens. 
  

   In 
  lateral 
  view, 
  the 
  distance 
  from 
  the 
  anterior 
  extremity 
  of 
  the 
  body 
  

   to 
  the 
  base 
  of 
  the 
  mouth 
  capsule 
  was 
  found 
  to 
  vary 
  from 
  162 
  to 
  216/* 
  

  

  NO. 
  2598.-PROCEEDINGS 
  U. 
  S. 
  NATIONAL 
  MUSEUM, 
  VOL. 
  67, 
  ART. 
  26 
  

   53651—25 
  1 
  

  

  