﻿A 
  REVISION 
  OF 
  THE 
  SOUTH 
  AMERICAN 
  DIPTEROUS 
  

   INSECTS 
  OF 
  THE 
  F.^IILY 
  PTYCHOPTERIDiE. 
  

  

  By 
  Charles 
  P. 
  Alexander, 
  

  

  Of 
  the 
  Entomological 
  Laboratory 
  of 
  Cornell 
  University, 
  Ithaca, 
  Netu 
  York. 
  

  

  The 
  only 
  genus 
  of 
  Ptychopteridse 
  as 
  yet 
  made 
  known 
  from 
  the 
  

   Neotropical 
  regions 
  is 
  Tanyderus 
  Philippi/ 
  erected 
  in 
  1865 
  to 
  

   receive 
  the 
  then 
  unique 
  species, 
  pictus 
  Pliilippi, 
  of 
  Chile. 
  Two 
  

   New 
  Zealand 
  species, 
  forcipatus 
  Osten 
  Sacken 
  ^ 
  and 
  annuliferus 
  

   Hutton,^ 
  have 
  been 
  described. 
  The 
  Oylindrotoma 
  omatissima, 
  

   described 
  by 
  Doleschall 
  from 
  the 
  East 
  Indies 
  in 
  1858, 
  was 
  later 
  found 
  

   to 
  be 
  a 
  true 
  Tanyderus.* 
  

  

  I 
  have 
  given, 
  below, 
  a 
  rather 
  free 
  translation 
  of 
  Philippi's 
  original 
  

   description 
  of 
  T. 
  pictus 
  and 
  also 
  add 
  tlie 
  description 
  of 
  a 
  fifth 
  species, 
  

   the 
  second 
  from 
  the 
  American 
  continent. 
  

  

  KEY 
  TO 
  THE 
  AMERICAN 
  SPECIES 
  OP 
  TANYDERUS. 
  

  

  Anal 
  angle 
  of 
  the 
  wing 
  very 
  sharp; 
  wing 
  with 
  two 
  brown 
  fasciae 
  which 
  are 
  almost 
  

   unicolorous 
  in 
  all 
  of 
  the 
  cells; 
  antennae 
  with 
  at 
  least 
  25 
  segments 
  pieties. 
  

  

  Anal 
  angle 
  of 
  the 
  wing 
  less 
  pronounced, 
  square; 
  wing 
  with 
  an 
  irregular 
  picture; 
  dark 
  

   along 
  the 
  cross- 
  veins, 
  much 
  paler 
  in 
  the 
  posterior 
  cells 
  of 
  the 
  wing; 
  antennae 
  

   17-segmented 
  patagonicus. 
  

  

  TANYDERUS 
  PICTUS 
  PhiUppi. 
  

  

  Length 
  body, 
  12 
  L; 
  wing 
  expanse, 
  26 
  1. 
  

  

  Head 
  quite 
  black, 
  only 
  the 
  antennae 
  are 
  pale 
  yellow, 
  except 
  the 
  

   first 
  two 
  segments, 
  which, 
  however, 
  are 
  black. 
  The 
  long, 
  slender 
  

   neck-like 
  prothorax 
  is 
  also 
  black 
  and 
  there 
  appears 
  above 
  in 
  the 
  

   cephalic 
  half 
  a 
  caniculated 
  excavation, 
  which 
  is 
  run 
  through 
  by 
  an 
  

   elevated 
  longitudinal 
  line 
  continumg 
  to 
  the 
  posterior 
  margin. 
  The 
  

   anterior 
  portion 
  of 
  the 
  mesothoracic 
  prsescutum 
  is 
  yellow 
  with 
  a 
  

   black 
  spot 
  in 
  the 
  middle 
  ; 
  the 
  remainder 
  of 
  the 
  mesothorax 
  is, 
  for 
  the 
  

   most 
  part, 
  black 
  ; 
  on 
  the 
  pleurae, 
  in 
  front 
  of 
  the 
  wing 
  basis, 
  is 
  a 
  j^ellow 
  

  

  1 
  R. 
  A. 
  Philippi. 
  Aufzahlung 
  der 
  Chilenischen 
  Dipteren, 
  Verb, 
  der 
  Zool.-bot. 
  Ges., 
  1865, 
  vol. 
  15, 
  pp. 
  

   780, 
  781, 
  pi. 
  29, 
  fig. 
  57. 
  

  

  2 
  Verb. 
  Zool.-bot. 
  Ges., 
  1879, 
  p. 
  518. 
  

  

  3 
  Trans. 
  New 
  Zealand 
  Institute, 
  vol. 
  32, 
  p. 
  48. 
  

  

  * 
  Osten 
  Sacken, 
  Studies 
  on 
  Tipulidse, 
  pt. 
  2, 
  1887, 
  pp. 
  228-230. 
  

  

  Proceedings 
  U. 
  S. 
  National 
  Museum, 
  Vol. 
  44— 
  No. 
  1 
  953. 
  

  

  331 
  

  

  