﻿560 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  and 
  there 
  was 
  an 
  inner 
  cocoon 
  of 
  finer 
  threads 
  closely 
  woven. 
  An 
  exam- 
  

   ination 
  of 
  the 
  contained 
  pupa 
  showed 
  it 
  to 
  be 
  a 
  hemerobian. 
  From 
  some 
  

   pupa 
  cases 
  stripped 
  from 
  the 
  trough 
  and 
  placed 
  in 
  a 
  vial 
  plugged 
  with 
  

   cotton, 
  I 
  first 
  bred 
  on 
  June 
  18 
  the 
  species 
  described 
  above 
  as 
  C 
  1 
  i 
  m 
  a 
  c 
  i 
  a 
  

   d 
  i 
  c 
  t 
  y 
  o 
  n 
  a 
  n. 
  sp. 
  The 
  same 
  day 
  I 
  found 
  my 
  first 
  specimen 
  at 
  large 
  

   in 
  one 
  of 
  the 
  hatchery 
  windows. 
  

  

  During 
  the 
  remainder 
  of 
  June 
  the 
  images 
  of 
  this 
  species 
  were 
  fairly 
  

   common. 
  Then 
  they 
  disappeared, 
  to 
  reappear 
  in 
  some 
  numbers 
  about 
  

   the 
  middle 
  of 
  August, 
  Whether 
  this 
  means 
  another 
  distinct 
  brood 
  I 
  

   can 
  not 
  say, 
  with 
  certainty. 
  

  

  The 
  larvae 
  and 
  pupae 
  are 
  very 
  similar 
  in 
  form 
  and 
  in 
  habits 
  to 
  those 
  

   of 
  Sisyra, 
  described 
  above. 
  The 
  cocoons 
  are 
  similarly 
  located, 
  and 
  

   are 
  often 
  intermixed 
  with 
  those 
  of 
  Sisyra, 
  but 
  are 
  much 
  more 
  beauti- 
  

   fully 
  and 
  skilfully 
  wrought. 
  The 
  imagos 
  were 
  taken 
  a 
  few 
  times 
  at 
  trap 
  

   lanterns, 
  and 
  in 
  sweeping 
  of 
  aquatic 
  vegetation, 
  but 
  the 
  hatchery 
  ceiling 
  

   was 
  the 
  best 
  collecting 
  ground. 
  The 
  eggs 
  were 
  not 
  found. 
  The 
  larvae, 
  

   as 
  in 
  Sisyra, 
  live 
  on 
  fresh-water 
  sponges. 
  

  

  I 
  could 
  find 
  none 
  of 
  these 
  sponges 
  in 
  condition 
  fit 
  for 
  determination 
  ; 
  

   up 
  to 
  the 
  time 
  of 
  leaving 
  Saranac 
  Inn 
  no 
  gemmules 
  were 
  developed 
  on 
  

   them. 
  The 
  commoner 
  species, 
  and 
  the 
  one 
  on 
  which 
  larvae 
  of 
  both 
  

   Sisyra 
  and 
  C 
  1 
  i 
  m 
  a 
  c 
  i 
  a 
  were 
  observed, 
  was 
  probably 
  S 
  p 
  o 
  n 
  g 
  i 
  1 
  1 
  a 
  

   fragilis 
  Leidy; 
  for 
  they 
  appeared 
  to 
  be 
  quite 
  the 
  same 
  species 
  as 
  

   that 
  on 
  which 
  I 
  found 
  Sisyra 
  larvae 
  at 
  Lake 
  Forest, 
  and 
  that 
  was 
  

   certainly 
  S. 
  fragilis. 
  It 
  was 
  not 
  without 
  interest 
  that 
  I 
  noted 
  a 
  

   striking 
  difference 
  in 
  the 
  behavior 
  of 
  this 
  sponge 
  in 
  the 
  two 
  localities. 
  

   At 
  Lake 
  Forest 
  it 
  grows 
  on 
  logs 
  in 
  a 
  very 
  shallow, 
  exposed 
  pond, 
  which 
  

   generally 
  dries 
  up 
  about 
  midsummer, 
  leaving 
  the 
  logs 
  exposed, 
  usually 
  

   to 
  remain 
  so 
  for 
  several 
  months. 
  There, 
  gemmules 
  were 
  fully 
  formed 
  

   before 
  the 
  first 
  of 
  July. 
  In 
  the 
  cool, 
  deep, 
  permanent 
  water 
  of 
  Little 
  

   Clear 
  pond, 
  however, 
  where 
  sponges 
  were 
  likewise 
  abundant 
  on 
  the 
  logs 
  

   but 
  not 
  subject 
  to 
  exposure 
  and 
  evaporation, 
  I 
  could 
  find 
  no 
  gemmules 
  

   at 
  all 
  up 
  to 
  the 
  time 
  of 
  my 
  departure, 
  August 
  20. 
  

  

  I 
  would 
  suggest 
  that 
  as 
  a 
  common 
  name 
  for 
  the 
  insects 
  of 
  these 
  two 
  

   genera, 
  spongilla 
  flies, 
  or 
  sponge 
  flies, 
  would 
  not 
  be 
  inappropriate. 
  

  

  