﻿NO. 
  1066. 
  SYNOPSIS 
  OF 
  NEOTROPICAL 
  LIMNOBINM— 
  ALEXANDER. 
  499 
  

  

  Abdomen: 
  tergum 
  dark 
  brown; 
  apices 
  of 
  the 
  segments 
  yellowish; 
  

   sternites 
  dull^^ellow; 
  hypopj^giimi 
  yellow. 
  

  

  Male, 
  San 
  Carlos, 
  Costa 
  Rica 
  (coll. 
  Schilde 
  and 
  Burgdorf). 
  Male, 
  

   Igarape-assu, 
  Para, 
  Brazil 
  (alcoholic, 
  Jan. 
  30, 
  1912) 
  (Parish, 
  coll.). 
  

   Female, 
  same 
  place 
  and 
  collector 
  as 
  last 
  (pinned, 
  Jan. 
  29, 
  1912). 
  

  

  Genus 
  MONGOMA 
  Westwood. 
  

  

  Mongoma 
  Westwood, 
  Trans. 
  Ent. 
  Soc. 
  Lond., 
  1881, 
  p. 
  364. 
  

   Trentepohlia 
  Bigot, 
  Ann. 
  Soc. 
  Ent. 
  France, 
  1854, 
  p. 
  474. 
  

   Paramongoma 
  Brunetti, 
  Rec. 
  Ind. 
  Mus., 
  vol. 
  6, 
  1911, 
  p. 
  295. 
  

   Mongomioides 
  Brunetti, 
  Rec. 
  Ind. 
  Mus., 
  vol. 
  6, 
  1911, 
  p. 
  296. 
  

   Mongomella 
  Enderlein, 
  Zool. 
  Jahrbuch, 
  vol. 
  32, 
  1912, 
  p. 
  61. 
  

  

  The 
  genus 
  Mongoma 
  was 
  erected 
  by 
  Westwood 
  in 
  1881 
  with 
  the 
  

   Af 
  vie 
  an 
  fragilUma 
  as 
  type. 
  No 
  mention 
  is 
  made, 
  in 
  this 
  paper, 
  of 
  the 
  

   Limnohia 
  trentepoTilii 
  Wiedemann 
  which 
  Bigot, 
  in 
  1854, 
  had 
  made 
  

   the 
  type 
  of 
  his 
  new 
  genus 
  Trentepohlia. 
  Osten 
  Sacken^ 
  uses 
  the 
  

   genus 
  Mongoma 
  but 
  mentions 
  that 
  it 
  is 
  congeneric 
  with 
  Trentepohlia. 
  

   Skuse^ 
  and 
  Bergroth^ 
  use 
  tlie 
  name 
  Trentepohlia. 
  Edwards* 
  uses 
  

   Trentepohlia 
  and 
  writes 
  that, 
  as 
  Bigot 
  deRnitelj 
  mentioned 
  trentepohlii 
  

   as 
  type, 
  the 
  name 
  can 
  not 
  be 
  rejected. 
  Brunetti^ 
  splits 
  the 
  old 
  genus 
  

   Mongoma 
  into 
  three, 
  proposing 
  Paramongoma 
  for 
  the 
  alhitarsis 
  group 
  

   of 
  the 
  genus, 
  and 
  Mongomioides 
  for 
  trentepohlii 
  and 
  its 
  allies. 
  Bru- 
  

   netti's 
  statement 
  that 
  australasise 
  is 
  a 
  strict 
  "Mongoma'' 
  (p. 
  291) 
  

   and, 
  a 
  little 
  later, 
  that 
  "The 
  only 
  Oriental 
  species 
  definitely 
  referable 
  

   to 
  Paramongoma 
  is 
  alhitarsis 
  Doleschall, 
  but 
  australasise 
  Skuse 
  is 
  

   certainly 
  congeneric" 
  (p. 
  296) 
  is 
  confusmg. 
  

  

  Still 
  more 
  recently 
  Enderlein*' 
  has 
  retamed 
  Trentepohlia 
  for 
  trente- 
  

   pohlii 
  and 
  its 
  allies, 
  as 
  was 
  suggested 
  by 
  Edwards,' 
  Mongoma 
  for 
  

   fragillima 
  and 
  its 
  allies, 
  and 
  has 
  proposed 
  the 
  new 
  name 
  Mongomella 
  

   for 
  the 
  alhitarsis 
  group, 
  with 
  pallida 
  Williston 
  as 
  type. 
  The 
  name 
  is, 
  

   of 
  course, 
  strictly 
  synonomous 
  with 
  Paramongoma 
  Brunetti. 
  

  

  I 
  have 
  recentl}^ 
  shown^ 
  that 
  the 
  species 
  of 
  the 
  genus 
  show 
  a 
  very 
  

   gradual 
  transition 
  from 
  one 
  to 
  another, 
  and 
  no 
  division, 
  not 
  even 
  

   subgeneric, 
  can 
  be 
  accepted. 
  For 
  instance, 
  the 
  new 
  species, 
  M. 
  dis- 
  

   juncta 
  would 
  represent 
  another 
  new 
  group 
  because 
  of 
  its 
  two 
  median 
  

   branches 
  that 
  reach 
  the 
  wing 
  margin, 
  the 
  Paramongoma 
  group 
  having 
  

   but 
  a 
  single 
  median 
  vein. 
  There 
  is 
  but 
  one 
  valid 
  genus, 
  with 
  but 
  a 
  

   single 
  subgenus, 
  included 
  in 
  the 
  Mongoma 
  group, 
  and 
  its 
  species 
  have 
  

   an 
  equatorial 
  distribution 
  (tropicopolitan). 
  

  

  1 
  studies 
  on 
  Tipulidae, 
  pt. 
  2, 
  Berl. 
  Ent. 
  Zeltschr., 
  vol. 
  31, 
  p. 
  204, 
  

  

  « 
  Dipt. 
  Australia, 
  p. 
  347. 
  

  

  3 
  Ent. 
  Tidskr., 
  vol. 
  9, 
  p. 
  135. 
  

  

  « 
  Ann. 
  and 
  Mag. 
  Nat. 
  Hist., 
  ser. 
  8, 
  vol. 
  8, 
  1911, 
  p. 
  63. 
  

  

  B 
  Rec. 
  Ind. 
  Mus., 
  vol. 
  6, 
  p. 
  291. 
  

  

  8 
  Zool. 
  Jahrbuch, 
  1912, 
  pp. 
  60-62. 
  

  

  'Idem, 
  p. 
  63. 
  

  

  f 
  Can. 
  Ent., 
  1912, 
  p. 
  88. 
  

  

  