﻿542 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  los 
  

  

  the 
  other 
  specimens. 
  It 
  is 
  possible 
  that 
  the 
  Las 
  Vegas 
  (in 
  Sierra 
  

   Nevada 
  de 
  Santa 
  JMarta) 
  birds 
  are 
  not 
  typical 
  C. 
  s. 
  aetherodroma. 
  

   Todd 
  originally 
  called 
  them 
  C. 
  s. 
  spinicauda, 
  saying 
  that 
  they 
  were 
  

   like 
  bu'ds 
  from 
  Venezuela 
  and 
  Trinidad, 
  although 
  Dr. 
  Wetmore 
  lists 
  

   the 
  Las 
  Vegas 
  birds 
  as 
  that 
  race 
  in 
  his 
  description 
  of 
  aetherodroma. 
  

  

  The 
  only 
  solution 
  to 
  this 
  problem 
  seems 
  to 
  be 
  the 
  separation 
  of 
  the 
  

   series 
  into 
  two 
  species, 
  the 
  male 
  and 
  female 
  types 
  of 
  meridionalis 
  

   and 
  the 
  single 
  male 
  from 
  El 
  Eeal 
  comprising 
  one 
  species 
  (meridionalis), 
  

   while 
  the 
  pair 
  of 
  "paratypes" 
  of 
  meridionalis 
  and 
  the 
  three 
  females 
  

   from 
  Colombia 
  form 
  the 
  other, 
  which 
  I 
  have 
  described 
  below 
  as 
  

   D. 
  limbus, 
  new 
  species. 
  

  

  D. 
  meridionalis 
  may 
  be 
  recognized 
  at 
  a 
  glance 
  by 
  the 
  peculiar 
  

   structure 
  of 
  the 
  metathorax 
  in 
  conjunction 
  with 
  the 
  prosternal 
  plate 
  

   and 
  its 
  chaetotaxy. 
  

  

  Measurements 
  of 
  the 
  t3T3es: 
  

  

  Male 
  Female 
  

  

  Length 
  Width 
  Length 
  Width 
  

  

  Body 
  2.13 
  2.71 
  

  

  Head: 
  

  

  ant. 
  fossae 
  .477 
  .50 
  

  

  temples 
  .51 
  .694 
  .545 
  .745 
  

  

  occiput 
  .456 
  .475 
  

  

  Prothorax 
  .29 
  .41 
  .326 
  .435 
  

  

  Meso-metathorax 
  .38 
  . 
  814 
  . 
  435 
  . 
  976 
  

  

  Abdomen 
  1.20 
  .705 
  1.62 
  1.02 
  

  

  Parameres 
  .206 
  .13 
  

  

  Dennyus 
  limbusy 
  new 
  species 
  

  

  Figure 
  63,a,d,f 
  

  

  Types. 
  — 
  Male 
  and 
  female 
  adults 
  from 
  Chaetura 
  spinicauda 
  fumosa 
  

   Salvin, 
  collected 
  by 
  the 
  author 
  at 
  Pozo 
  Azul, 
  Costa 
  Rica, 
  June 
  1902 
  

   (in 
  collection 
  of 
  author) 
  . 
  

  

  Diagnosis. 
  — 
  Closeh'' 
  related 
  to 
  duhius 
  (Kellogg) 
  and 
  hruneri 
  (Car- 
  

   riker) 
  , 
  having 
  the 
  same 
  concave 
  posterolateral 
  margins 
  of 
  the 
  temples 
  

   and 
  the 
  same 
  thoracic 
  structure. 
  

  

  D. 
  limbus 
  differs 
  from 
  hruneri 
  in 
  the 
  wider 
  head 
  (.49 
  by 
  .684 
  against 
  

   .48 
  by 
  .63) 
  and 
  much 
  wider 
  thorax 
  (.76 
  against 
  .615); 
  the 
  abdomen 
  

   (females) 
  is 
  smaller 
  (1.20 
  by 
  .716 
  against 
  1.26 
  by 
  .80). 
  It 
  differs 
  

   from 
  both 
  duhius 
  and 
  hruneri 
  in 
  the 
  shape 
  and 
  chaetotaxy 
  of 
  the 
  

   prosternal 
  plate. 
  The 
  plate 
  is 
  much 
  larger 
  than 
  that 
  of 
  hruneri, 
  

   having 
  four 
  setae 
  (two 
  long 
  and 
  two 
  short) 
  set 
  in 
  the 
  marginal 
  band, 
  

   while 
  hruneri 
  has 
  eight 
  shorter 
  setae, 
  all 
  within 
  the 
  clear 
  median 
  area. 
  

   D. 
  duhius 
  has 
  but 
  three 
  long 
  setae, 
  set 
  at 
  head 
  of 
  median 
  clear 
  area. 
  

   A 
  discussion 
  of 
  the 
  metathoracic 
  characters 
  is 
  given 
  under 
  remarks 
  on 
  

   meridionalis 
  and 
  in 
  the 
  key. 
  

  

  