﻿NO. 
  1966. 
  SYNOPSIS 
  OF 
  NEOTROPICAL 
  LIMNOBINJE— 
  ALEXANDER. 
  483 
  

  

  Antochini 
  common, 
  especially 
  EhampMdia 
  and 
  Teucholabis; 
  Eriop- 
  

   terini 
  numerous; 
  Limnophilini 
  common 
  {LimnopJiila, 
  Polymera, 
  and 
  

   Epiphragma), 
  Hexatomini 
  very 
  numerous, 
  almost 
  all 
  being 
  Eriocersa; 
  

   the 
  TipulinaB 
  are 
  represented 
  by 
  an 
  abundance 
  of 
  Tipula, 
  Pachyrhina, 
  

   Brachypreinna, 
  Tanypremna, 
  and 
  Megistocera. 
  

  

  GEOGRAPHICAL 
  DISTRIBUTION. 
  

  

  Concerning 
  the 
  geographical 
  conditions 
  of 
  the 
  regions 
  where 
  certain 
  

   of 
  the 
  included 
  material 
  was 
  collected, 
  the 
  following 
  are 
  of 
  interest: 
  

  

  BRITISH 
  GUIANA. 
  

  

  Toomatoomari. 
  — 
  Cataracts 
  on 
  the 
  Potaro 
  River, 
  8 
  miles 
  above 
  the 
  junction 
  with 
  

   the 
  Essequibo. 
  

  

  Kaicteur 
  (Falls). 
  — 
  Fonned 
  by 
  the 
  fall 
  of 
  the 
  River 
  Potaro, 
  a 
  tributary 
  of 
  the 
  Esse- 
  

   quibo, 
  over 
  an 
  abrupt 
  cliff 
  of 
  741 
  feet. 
  The 
  width 
  of 
  the 
  fall 
  at 
  times 
  of 
  high 
  water 
  is 
  

   370 
  feet 
  while 
  at 
  low 
  water 
  it 
  decreases 
  to 
  rather 
  less 
  than 
  half 
  that 
  width.' 
  

  

  The 
  rainy 
  season 
  of 
  November-January 
  was 
  entirely 
  skipped. 
  Ordinarily 
  the 
  

   lowest 
  water 
  stage 
  of 
  the 
  year 
  is 
  in 
  October, 
  following 
  the 
  so-called 
  long 
  dry 
  season. 
  

   But 
  in 
  February, 
  when 
  we 
  were 
  there, 
  the 
  river 
  captains 
  and 
  crews 
  on 
  both 
  the 
  

   Demerara 
  and 
  Essequibo 
  Rivers 
  reported 
  that 
  the 
  water 
  there 
  was 
  the 
  lowest 
  they 
  

   had 
  ever 
  seen 
  it 
  at 
  any 
  season. 
  Swamps 
  which 
  I 
  made 
  some 
  effort 
  to 
  reach, 
  and 
  which 
  

   I 
  was 
  assured 
  I 
  would 
  find 
  waist 
  deep 
  in 
  water, 
  were 
  in 
  every 
  case 
  entirely 
  dry, 
  and 
  

   usually 
  baked 
  and 
  cracked. 
  * 
  * 
  * 
  I 
  believe 
  the 
  time 
  of 
  year 
  to 
  go 
  after 
  both 
  of 
  

   these 
  groups 
  (Tipulidae 
  and 
  Syrphidse) 
  in 
  the 
  Tropics 
  is 
  August 
  or 
  the 
  end 
  of 
  the 
  long 
  

   rainy 
  season. 
  The 
  end 
  of 
  the 
  short 
  rainy 
  season 
  (December 
  and 
  January) 
  would 
  also 
  

   be 
  favorable, 
  but 
  this 
  is 
  an 
  uncertain 
  season 
  and 
  has 
  failed 
  in 
  the 
  past, 
  as 
  it 
  did 
  in 
  

   1911-12. 
  In 
  fact, 
  the 
  best 
  time 
  for 
  collecting 
  in 
  either 
  Trinidad 
  or 
  British 
  Guiana 
  

   is 
  during 
  your 
  summer 
  vacation 
  — 
  June, 
  July, 
  and 
  August. 
  It 
  is 
  rather 
  strange 
  that 
  

   more 
  students 
  in 
  the 
  East, 
  close 
  to 
  New 
  York, 
  do 
  not 
  go 
  South 
  during 
  the 
  summer. 
  ^ 
  

  

  Chapada. 
  — 
  A 
  small 
  village 
  of 
  Matto 
  Grosso, 
  Brazil, 
  about 
  25 
  miles 
  ENE. 
  of 
  Cuyaba 
  

   (the 
  capital 
  of 
  Matto 
  Grosso), 
  on 
  the 
  plateau. 
  The 
  village 
  itself 
  is 
  about 
  2, 
  -500 
  feet 
  

   above 
  sea 
  level, 
  or 
  1,800 
  feet 
  above 
  Cuyaba, 
  but 
  collections 
  are 
  from 
  all 
  the 
  surrounding 
  

   region 
  as 
  low 
  as 
  1,.500 
  feet. 
  This 
  is 
  a 
  country 
  of 
  mixed 
  forest 
  and 
  campo, 
  or 
  grassland, 
  

   with 
  scattered 
  trees; 
  there 
  are 
  many 
  streams 
  — 
  some 
  small 
  lakes 
  or 
  ponds 
  and 
  tracts 
  

   of 
  more 
  or 
  less 
  boggy 
  savanna 
  where 
  the 
  streams 
  rise 
  . 
  The 
  name 
  Chapada 
  is 
  really 
  a 
  

   generic 
  application, 
  applied 
  to 
  the 
  plateau 
  in 
  general. 
  The 
  real 
  name 
  of 
  this 
  village 
  

   is 
  Santa 
  Anna 
  la 
  Chapada 
  , 
  and 
  in 
  some 
  maps 
  it 
  appears 
  as 
  Santa 
  Anna, 
  but 
  in 
  all 
  that 
  

   region 
  it 
  is 
  known 
  simply 
  as 
  Chapada, 
  or 
  the 
  Chapada. 
  

  

  Corumba. 
  — 
  A 
  town 
  on 
  the 
  River 
  Paraguay, 
  near 
  the 
  junction 
  of 
  the 
  Taguary, 
  the 
  

   port 
  of 
  entry 
  for 
  Matto 
  Grosso. 
  There 
  is 
  a 
  tract 
  of 
  dry 
  rocky 
  land, 
  a 
  kind 
  of 
  island, 
  in 
  

   the 
  flood 
  plain 
  of 
  the 
  Paraguay, 
  which 
  is 
  here 
  very 
  extensive. 
  Collections 
  were 
  made 
  

   principally 
  on 
  the 
  flood 
  plain; 
  the 
  waters 
  were 
  rising, 
  but 
  I 
  used 
  to 
  wade 
  about 
  with 
  

   a 
  boy 
  pushing 
  a 
  canoe 
  through 
  the 
  grass 
  behind 
  me. 
  These 
  flood 
  plains 
  are 
  mostly 
  

   open 
  grassland, 
  with 
  some 
  forest 
  along 
  the 
  river 
  and 
  channels.^ 
  (H. 
  H. 
  Smith.) 
  

  

  From 
  Among 
  the 
  Indians 
  of 
  Guiana, 
  by 
  Everard 
  F. 
  Im 
  Thum. 
  (1883). 
  

   2 
  Letter 
  from 
  E. 
  B. 
  Williamson 
  to 
  J. 
  G. 
  Needham, 
  April 
  23, 
  1912. 
  

  

  ' 
  From 
  Contributions 
  to 
  a 
  Knowledge 
  of 
  the 
  Odonata 
  of 
  the 
  Neotropical 
  Region, 
  by 
  P. 
  P. 
  Calvert, 
  Ann. 
  

   Carnegie 
  Mus., 
  vol. 
  6, 
  No. 
  1, 
  1909. 
  

  

  