﻿332 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  spot, 
  and 
  the 
  space 
  before 
  the 
  scutellum 
  is 
  hkewise 
  yellow; 
  remainder 
  

   of 
  the 
  pleursB 
  yellow 
  with 
  black 
  spots 
  ; 
  metanotum 
  is 
  yellowish 
  with 
  

   four 
  black 
  s]5ots 
  on 
  the 
  caudal 
  margin. 
  The 
  segments 
  of 
  the 
  abdomen 
  

   are 
  yellow 
  with 
  black 
  posterior 
  edges 
  and 
  black 
  longitudmal 
  spots, 
  of 
  

   wliich 
  there 
  are 
  four 
  on 
  the 
  dorsum 
  in 
  two 
  rows. 
  The 
  wings 
  have 
  

   yellow 
  veins 
  and 
  a 
  yellowish 
  membrane, 
  especially 
  in 
  the 
  middle^ 
  

   and 
  there 
  are 
  ramifying, 
  yellow, 
  black-bordered 
  crossbands, 
  which 
  

   make 
  tliis 
  species 
  one 
  of 
  our 
  most 
  beautiful 
  Tipulids. 
  The 
  legs 
  are 
  

   yellowish 
  mth 
  black 
  coxae 
  and 
  a 
  blackish 
  ring 
  above 
  and 
  below 
  the 
  

   knee; 
  they 
  are 
  rather 
  strongly 
  haired. 
  Halteres 
  are 
  black 
  with 
  

   bright 
  stem. 
  

  

  The 
  species 
  has 
  an 
  extremely 
  sharp 
  anal 
  angle 
  and 
  possesses 
  a 
  

   supernumerar}^ 
  cross 
  vein 
  in 
  cell 
  R^ 
  of 
  the 
  wing. 
  

  

  Fig. 
  1.— 
  Lateral 
  aspect 
  op 
  the 
  head 
  op 
  Tanyderus 
  patagonicus. 
  a, 
  Antenna; 
  b, 
  clypeus; 
  

   c, 
  maxillary 
  palpus; 
  d, 
  labrum; 
  e, 
  maxilla; 
  /, 
  hypopharynx 
  (?); 
  g, 
  hypopharynx 
  (?); 
  h, 
  

  

  LABIUM. 
  

  

  TANYDERUS 
  PATAGONICUS, 
  new 
  species. 
  

  

  Antennae 
  17-segmented; 
  thorax 
  gray 
  with 
  chestnut 
  stripes; 
  anal 
  

   angle 
  of 
  tlie 
  wings 
  not 
  prominent; 
  supernumerary 
  cross 
  veins 
  in 
  cells 
  

   i?3 
  and 
  i?5; 
  wings 
  marked 
  with 
  brown 
  and 
  gray. 
  

  

  Female. 
  — 
  Length, 
  12.1 
  mm.; 
  wing, 
  18.2 
  mm. 
  Legs, 
  posterior 
  

   femora, 
  8.2 
  mm.; 
  tibia, 
  9.8 
  mm. 
  

  

  Head. 
  — 
  Mouth 
  parts, 
  clypeus 
  (b) 
  rather 
  quadrate, 
  about 
  as 
  broad 
  

   as 
  long; 
  the 
  labrum 
  closely 
  applied 
  to 
  its 
  cephalic 
  margin. 
  Labrum 
  

   (d) 
  elongate, 
  depressed, 
  flattened, 
  its 
  edges 
  toward 
  the 
  tip, 
  with 
  

   numerous 
  stout 
  hairs; 
  underneath 
  the 
  labrum 
  is 
  a 
  pair 
  (e) 
  of 
  elon- 
  

  

  