﻿590 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  ,voL. 
  103 
  

  

  imbedded 
  in 
  the 
  joint 
  capsule. 
  The 
  belly 
  does 
  not 
  fan 
  out 
  at 
  its 
  

   insertion. 
  

  

  M. 
  expansor 
  secundariorum 
  is 
  a 
  single 
  muscle 
  with 
  two 
  tendons 
  of 
  

   origin 
  : 
  a 
  scapular 
  tendon 
  and 
  a 
  humeral 
  tendon. 
  

  

  M. 
  scapulotriceps 
  does 
  not 
  have 
  an 
  accessory 
  attachment 
  to 
  the 
  

   humerus. 
  

  

  M. 
  subcoracoideus 
  has 
  two 
  heads, 
  one 
  arises 
  from 
  the 
  f 
  urculum 
  and 
  

   the 
  other 
  arises 
  from 
  the 
  coracoclavicular 
  membrane 
  as 
  in 
  other 
  

   cuckoos. 
  

  

  M. 
  deltoideus 
  minor 
  is 
  present 
  and 
  arises 
  inside 
  the 
  triosseal 
  canal 
  

   from 
  the 
  inferior 
  f 
  urcular 
  process. 
  

  

  In 
  all 
  four 
  species, 
  the 
  tendon 
  of 
  M. 
  latissimus 
  dorsi, 
  pars 
  posticus, 
  

   inserts 
  posterior 
  to 
  and 
  in 
  contact 
  with 
  the 
  tendon 
  of 
  pars 
  anticus. 
  

   In 
  Chalcites^ 
  Chrysococcyx, 
  and 
  Lampromorphu 
  klaas 
  the 
  area 
  of 
  in- 
  

   sertion 
  of 
  pars 
  posticus 
  begins 
  about 
  .5 
  mm. 
  proximal 
  to 
  the 
  insertion 
  

   of 
  pars 
  anticus, 
  whereas 
  in 
  Lampromorpha 
  caprius 
  the 
  insertion 
  of 
  

   pars 
  posticus 
  begins 
  about 
  .5 
  mm. 
  distal 
  to 
  the 
  uppermost 
  fibers 
  of 
  

   insertion 
  of 
  pars 
  anticus. 
  A 
  dermal 
  component 
  is 
  present, 
  but 
  is 
  very 
  

   small, 
  and 
  I 
  was 
  unable 
  to 
  demonstrate 
  it 
  in 
  every 
  specimen. 
  

  

  In 
  each 
  species, 
  M. 
  pronator 
  longus 
  is 
  a 
  relatively 
  short 
  muscle, 
  ex- 
  

   tending 
  distad 
  the 
  same 
  distance 
  as 
  M. 
  pronator 
  brevis, 
  i. 
  e., 
  about 
  two- 
  

   thirds 
  the 
  length 
  of 
  the 
  radius. 
  

  

  M. 
  flexor 
  digitorum 
  profundus 
  arises 
  on 
  both 
  sides 
  of 
  the 
  area 
  of 
  

   insertion 
  of 
  M. 
  brachialis. 
  

  

  M. 
  flexor 
  carpi 
  ulnaris 
  brevis 
  (fig. 
  70) 
  shows 
  the 
  best 
  development 
  

   yet 
  seen 
  in 
  cuckoos. 
  The 
  fleshy 
  belly 
  is 
  relatively 
  and 
  absolutely 
  

   longer 
  (14 
  mm. 
  in 
  Chrysococcyx 
  and 
  Lampromorpha 
  caprius) 
  than 
  

   in 
  Coua^ 
  Geococcyx^ 
  etc., 
  and 
  the 
  belly 
  is 
  located 
  more 
  proximally 
  on 
  

   the 
  ulna. 
  

  

  M. 
  flexor 
  metacarpi 
  brevis 
  is 
  well 
  developed 
  in 
  all 
  four 
  species. 
  The 
  

   belly 
  is 
  triangular 
  in 
  shape; 
  it 
  arises 
  fleshy 
  from 
  the 
  base 
  of 
  the 
  

   carpometacarpus 
  ; 
  it 
  inserts 
  on 
  the 
  tendon 
  of 
  M. 
  extensor 
  indicis 
  

   longus. 
  

  

  M. 
  extensor 
  pollicis 
  brevis 
  exhibits 
  minor 
  variation. 
  In 
  Chryso- 
  

   coccyx 
  cupreus 
  none 
  of 
  its 
  fibers 
  appear 
  to 
  arise 
  from 
  the 
  tendon 
  of 
  M. 
  

   extensor 
  pollicis 
  longus. 
  In 
  LampromorpTia 
  caprius 
  there 
  are 
  two 
  

   heads 
  as 
  in 
  Crotophaga 
  suIcirosU'is. 
  In 
  Chalcites 
  the 
  structure 
  is 
  in- 
  

   termediate 
  between 
  that 
  found 
  in 
  Crotophaga 
  and 
  in 
  Coccyzus, 
  and 
  a 
  

   few 
  fibers 
  arise 
  from 
  the 
  tendon 
  of 
  M. 
  extensor 
  pollicis 
  longus. 
  

  

  M. 
  abductor 
  pollicis 
  is 
  a 
  small 
  muscle 
  with 
  a 
  maximum 
  length 
  of 
  

   6 
  mm. 
  I 
  found 
  two 
  bellies 
  to 
  this 
  muscle 
  in 
  Chrysococcyx 
  cupreus^ 
  

   but 
  I 
  was 
  unable 
  to 
  determine 
  to 
  my 
  satisfaction 
  in 
  preserved 
  material 
  

   that 
  there 
  are 
  two 
  parts 
  in 
  Lampromorpha 
  or 
  Chalcites. 
  The 
  origin 
  

   and 
  insertion 
  of 
  this 
  muscle 
  are 
  in 
  each 
  case, 
  however, 
  typical 
  for 
  

   cuckoos. 
  

  

  