﻿AQUATIC 
  INSECTS 
  IN 
  THE 
  ADIRONDACKS 
  

  

  555" 
  

  

  from 
  S. 
  V 
  i 
  c 
  a 
  r 
  i 
  a 
  in 
  being 
  much 
  larger, 
  according 
  to 
  the 
  measurements 
  

   given 
  in 
  the 
  extremely 
  brief 
  and 
  uncritical 
  published 
  descriptions 
  of 
  that 
  

   species. 
  There 
  is 
  a 
  specimen 
  from 
  Illinois 
  in 
  the 
  Museum 
  of 
  comparative 
  

   zoology, 
  and 
  I 
  collected 
  many 
  specimens 
  of 
  both 
  larvae 
  and 
  adults 
  at 
  

   Lake 
  Forest 
  111. 
  in 
  June 
  1899. 
  I 
  did 
  not 
  at 
  that 
  time 
  rear 
  the 
  species, 
  

   however. 
  I 
  describe 
  it 
  below 
  as 
  Sisyra 
  umbrata 
  n. 
  sp. 
  

  

  In 
  passing, 
  I 
  should 
  call 
  attention 
  to 
  an 
  error 
  almost 
  uniformly 
  com- 
  

   mitted 
  in 
  the 
  characterizing 
  of 
  this 
  genus 
  : 
  there 
  is 
  said 
  to 
  be 
  no 
  cross 
  

   vein 
  in 
  the 
  basal 
  part 
  of 
  the 
  subcostal 
  space. 
  As 
  a 
  matter 
  of 
  fact, 
  that 
  

   cross 
  vein 
  is 
  almost 
  always 
  present, 
  though 
  it 
  is 
  sometimes 
  not 
  very 
  dis- 
  

   tinct. 
  I 
  have 
  examined 
  specimens 
  of 
  three 
  European 
  species 
  in 
  the 
  

   Museum 
  of 
  comparative 
  zoology, 
  among 
  them 
  a 
  large 
  series 
  of 
  specimens 
  

   of 
  the 
  typical 
  S. 
  fuscata, 
  as 
  well 
  as 
  hundreds 
  of 
  specimens 
  of 
  the 
  

   species 
  described 
  below, 
  and 
  have 
  not 
  noted 
  the 
  absence 
  of 
  this 
  cross 
  

   vein 
  in 
  a 
  single 
  case. 
  

  

  Sisyra 
  umbrata 
  sp. 
  nov. 
  

  

  PL 
  12, 
  fig. 
  6, 
  1 
  and 
  33, 
  34, 
  36 
  text 
  figures 
  

  

  Length 
  to 
  tip 
  of 
  wings, 
  male 
  6 
  mm 
  ; 
  female 
  8 
  mm 
  ; 
  expanse 
  of 
  wings, 
  

   male 
  12 
  mm, 
  female 
  13 
  mm. 
  

  

  Color 
  nearly 
  uniform 
  blackish 
  brown. 
  There 
  is 
  a 
  faint 
  wash 
  of 
  rufous 
  

   on 
  the 
  face, 
  the 
  legs 
  and 
  the 
  apex 
  of 
  the 
  abdomen 
  are 
  dirty 
  yellowish. 
  

  

  Fig. 
  33 
  Fore 
  wing 
  of 
  Sisyra 
  umbrata 
  

  

  Lake 
  Forest 
  111. 
  June 
  1899; 
  Saranac 
  Inn 
  N. 
  Y. 
  June 
  28 
  to 
  July 
  16, 
  

   1900; 
  abundant. 
  

  

  This 
  is 
  a 
  stouter, 
  larger, 
  blacker, 
  more 
  hairy 
  species 
  than 
  S. 
  fuscata. 
  

   The 
  second 
  segment 
  of 
  the 
  antennae 
  is 
  nearly 
  as 
  large 
  as 
  the 
  third 
  and 
  

   fourth 
  together, 
  and 
  the 
  third 
  is 
  litde 
  more 
  than 
  half 
  the 
  size 
  of 
  the 
  

   fourth; 
  in 
  S. 
  fuscata 
  the 
  second, 
  third 
  and 
  fourth 
  antennal 
  segments 
  

   are 
  subequal, 
  and 
  the 
  third 
  is 
  not 
  distinctly 
  smaller 
  than 
  the 
  fourth. 
  In 
  

  

  