﻿334 
  PROCEEDINOS 
  OF 
  THE 
  yATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  Front 
  dark 
  brown, 
  black 
  apically 
  and 
  with 
  a 
  narrow 
  median 
  stripe; 
  

   vertex 
  brown 
  with 
  a 
  black 
  U-shaped 
  mark 
  between 
  the 
  eyes; 
  occiput 
  

   and 
  gense 
  broAvn. 
  

  

  Cervical 
  sclcrites 
  prominent, 
  transverse, 
  deep 
  velvety 
  black 
  on 
  the 
  

   dorsal 
  mid 
  line, 
  grayish 
  brown 
  laterally. 
  

  

  Thorax. 
  — 
  Pronotum, 
  the 
  scutum 
  projects 
  on 
  the 
  dorsal 
  surface 
  of 
  

   the 
  insect, 
  the 
  scutellum 
  is 
  not 
  visible 
  from 
  above, 
  dark 
  brown, 
  paler 
  

   on 
  the 
  sides. 
  Mesonotum, 
  prascutum 
  gray, 
  the 
  extreme 
  mid 
  line 
  nar- 
  

   rowly 
  black; 
  on 
  either 
  side 
  of 
  tliis, 
  extending 
  from 
  the 
  cephalic 
  

   margin 
  of 
  the 
  sclerite 
  backward 
  to 
  the 
  transverse 
  suture 
  where 
  they 
  

   become 
  confluent, 
  a 
  broad 
  chestnut 
  stripe; 
  laterad 
  of 
  this, 
  near 
  the 
  

   middle 
  of 
  the 
  sclerite, 
  a 
  broad 
  brownish-chestnut 
  stripe 
  runs 
  back- 
  

   ward, 
  interrupted 
  by 
  the 
  shallow, 
  open, 
  transverse 
  suture. 
  Scutum 
  

   light 
  brown 
  mesially, 
  caused 
  by 
  the 
  spreading 
  out 
  of 
  the 
  central 
  

   prsescutal 
  stripes; 
  on 
  the 
  sides 
  of 
  the 
  sclerite 
  are 
  the 
  well-defined 
  

  

  Sci 
  

  

  I 
  St 
  A 
  

  

  ^IG. 
  3.— 
  Wing 
  of 
  Tanyderus 
  patagonicus. 
  Sci, 
  si'bcosta 
  1; 
  iJi, 
  radius 
  1; 
  R^, 
  radius 
  5; 
  Mu 
  media 
  1 
  

  

  Cui, 
  CUBITUS 
  1; 
  1st 
  A, 
  ANAL. 
  

  

  continuations 
  of 
  the 
  brownish-chestnut 
  lateral 
  praescutal 
  stripes; 
  

   scutellum 
  and 
  post-no 
  tum 
  rich 
  brown; 
  metanotum 
  dull 
  brown. 
  

   Pleurae, 
  spiracles 
  prominent, 
  spongy 
  in 
  appearance, 
  yellow; 
  epi- 
  

   pleurse 
  gray, 
  sternal 
  region 
  more 
  brown. 
  Halteres 
  brown, 
  stem 
  

   slightly 
  paler. 
  Legs, 
  coxae, 
  and 
  trochanters 
  dull 
  gray; 
  femora 
  rich 
  

   brown; 
  dark 
  brown 
  at 
  the 
  tip; 
  tibia 
  extreme 
  base 
  and 
  tip 
  brown, 
  

   remainder 
  yellow; 
  tarsi 
  dark 
  brown. 
  

  

  ^Ymgs. 
  — 
  Venation, 
  8c 
  long, 
  its 
  tip 
  nearer 
  the 
  fork 
  of 
  R^+^ 
  than 
  to 
  

   the 
  fork 
  of 
  /? 
  4 
  + 
  5; 
  a 
  spur 
  at 
  the 
  fork 
  oi 
  Sc, 
  a 
  slight 
  spur 
  at 
  the 
  origin 
  

   of 
  i?5; 
  an 
  oblique 
  supernumerary 
  cross 
  vein 
  in 
  cell 
  R^; 
  a 
  second 
  one 
  

   in 
  cell 
  i?5. 
  Anal 
  angle 
  of 
  the 
  whig 
  not 
  especially 
  prominent. 
  

  

  Wings 
  (fig. 
  3) 
  subhyaline, 
  veins 
  brown; 
  cells 
  C 
  and 
  Sc 
  yellow; 
  

   wings 
  marked 
  with 
  gray 
  and 
  brown 
  as 
  follows: 
  Brown; 
  a 
  rounded 
  

   spot 
  at 
  the 
  base 
  of 
  the 
  wing 
  under 
  the 
  cross 
  vein 
  ^; 
  a 
  second 
  at 
  the 
  

   origin 
  of 
  Rg] 
  a 
  third 
  under 
  the 
  tip 
  of 
  Sc; 
  a 
  large 
  irregular 
  spot 
  ex- 
  

   tending 
  along 
  the 
  cord 
  which 
  is 
  on 
  the 
  proximal 
  half 
  of 
  the 
  wing; 
  a 
  

  

  