﻿ANATOMY 
  AND 
  RELATIONSHIP 
  OF 
  GLOSSY 
  CUCKOOS 
  — 
  BERGER 
  595 
  

  

  poUicis, 
  flexor 
  hallucis 
  longus, 
  and 
  extensor 
  hallucis 
  longus. 
  It 
  must 
  

   be 
  emphasized, 
  however, 
  that 
  all 
  differences 
  in 
  structure 
  here 
  dis- 
  

   cussed 
  are 
  minor 
  in 
  degree. 
  

  

  An 
  analysis 
  of 
  M. 
  iliotibialis 
  will 
  serve 
  to 
  illustrate 
  the 
  minor 
  dif- 
  

   ferences 
  encountered 
  and 
  to 
  cast 
  doubt 
  on 
  the 
  validity 
  of 
  them 
  as 
  a 
  

   basis 
  for 
  establishing 
  separate 
  genera. 
  The 
  structure 
  of 
  this 
  muscle 
  

   has 
  been 
  discussed 
  in 
  some 
  detail 
  above 
  (p. 
  591). 
  The 
  complete 
  apo- 
  

   neurotic 
  central 
  portion 
  of 
  M. 
  iliotibialis 
  in 
  Lampromorpha 
  caprius 
  

   is 
  most 
  like 
  the 
  structure 
  of 
  that 
  muscle 
  in 
  Coccyzus. 
  In 
  each 
  of 
  eight 
  

   other 
  genera 
  {Crotophaga^ 
  Geococcyx^ 
  Coua, 
  etc.) 
  the 
  aponeurotic 
  

   portion 
  is 
  limited 
  to 
  the 
  distal 
  half 
  or 
  two-thirds 
  and 
  there 
  is 
  a 
  well- 
  

   developed 
  fleshy 
  belly 
  located 
  proximal 
  to 
  this 
  aponeurosis. 
  Only 
  in 
  

   Chrysococcyx 
  cupreus 
  and 
  Lampromorpha 
  klaas, 
  where 
  the 
  middle 
  

   fleshy 
  portion 
  is 
  very 
  small, 
  does 
  the 
  structure 
  of 
  the 
  muscle 
  

   represent 
  an 
  intermediate 
  stage. 
  The 
  locomotor 
  pattern 
  seems 
  to 
  be 
  

   similar 
  in 
  these 
  species 
  (Friedmann 
  (1948, 
  pp. 
  129, 
  150, 
  158) 
  implies 
  

   this 
  as 
  regards 
  the 
  manner 
  of 
  flight), 
  so 
  one 
  might 
  place 
  some 
  

   weight 
  on 
  this 
  character 
  as 
  indicating 
  degree 
  of 
  relationship. 
  Also, 
  

   the 
  place 
  of 
  insertion 
  of 
  the 
  syringeal 
  muscles, 
  if 
  proven 
  constant, 
  

   would 
  indicate 
  relationship 
  as 
  follows 
  : 
  caprius 
  with 
  luddus 
  (insertion 
  

   on 
  the 
  third 
  bronchial 
  ring) 
  ; 
  cupreus 
  with 
  Maxis 
  (insertion 
  on 
  the 
  

   fourth 
  ring). 
  Minor 
  differences 
  in 
  other 
  muscles, 
  however, 
  indicate 
  

   a 
  closer 
  relationship 
  between 
  lucidus 
  and 
  cupreus 
  than 
  between 
  the 
  

   former 
  and 
  caprius^ 
  so 
  that 
  it 
  seems 
  unlikely 
  that 
  the 
  structure 
  of 
  

   M. 
  iliotibialis, 
  in 
  this 
  instance, 
  is 
  a 
  valid 
  character 
  for 
  judging 
  rela- 
  

   tionship. 
  In 
  anatomical 
  features 
  Maas 
  resembles 
  cupreus 
  more 
  than 
  

   it 
  does 
  caprius. 
  Van 
  Someren 
  (1925, 
  pp. 
  660-662) 
  came 
  to 
  the 
  same 
  

   conclusion 
  after 
  a 
  study 
  of 
  feather 
  structure; 
  he 
  stated 
  that 
  Maas 
  

   should 
  either 
  be 
  placed 
  with 
  cupreus 
  in 
  the 
  genus 
  Chrysococcyx 
  or 
  

   else 
  in 
  an 
  intermediate 
  position, 
  but 
  that 
  Maas 
  could 
  not 
  be 
  placed 
  with 
  

   caprius 
  if 
  only 
  two 
  genera 
  were 
  to 
  be 
  recognized. 
  Both 
  van 
  Someren 
  

   and 
  Friedmann 
  (1948, 
  pp. 
  150, 
  151) 
  felt 
  that 
  cupreus, 
  caprius, 
  and 
  

   Maa^ 
  are 
  congeneric. 
  

  

  In 
  reviewing 
  the 
  evidence 
  presented 
  here, 
  I 
  must 
  conclude 
  that 
  all 
  

   of 
  the 
  glossy 
  cuckoos 
  are 
  congeneric. 
  Following 
  the 
  law 
  of 
  priority, 
  

   all 
  the 
  species 
  of 
  this 
  complex 
  must 
  be 
  placed 
  in 
  the 
  genus 
  Chryso- 
  

   coccyx. 
  Anatomical 
  similarities 
  further 
  suggest 
  that 
  cupreus 
  and 
  

   Maas 
  are 
  more 
  closely 
  related 
  to 
  each 
  other 
  than 
  to 
  either 
  caprius 
  or 
  

   lucidus. 
  Though 
  lucidus 
  possesses 
  certain 
  anatomical 
  features 
  ex- 
  

   hibited 
  by 
  caprius 
  (especially 
  the 
  structure 
  of 
  M. 
  iliotibialis 
  and 
  the 
  

   place 
  of 
  insertion 
  of 
  the 
  syringeal 
  muscles) 
  , 
  in 
  most 
  respects 
  lucidus 
  

   is 
  like 
  cupreus. 
  Therefore, 
  caprius 
  is 
  most 
  unlike 
  the 
  other 
  species 
  

   of 
  this 
  genus. 
  

  

  