﻿422 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  1885 
  Baetis 
  pygmaeus 
  Eaton, 
  Linn. 
  soc. 
  Lond. 
  Trans. 
  (2) 
  3: 
  170 
  (a 
  new 
  

  

  description 
  of 
  the 
  fragments 
  remaining 
  of 
  the 
  type) 
  

   1892 
  Baetis 
  pygmaea 
  Banks, 
  Am. 
  ent. 
  soc. 
  Trans. 
  19 
  : 
  348 
  (listed) 
  

  

  All 
  the 
  above 
  are 
  bare 
  descriptions 
  of 
  the 
  single 
  female 
  specimen 
  in 
  

   the 
  Hagen 
  collection 
  from 
  the 
  St 
  Lawrence 
  river. 
  

  

  I 
  studied 
  this 
  fragmentary 
  type 
  specimen 
  in 
  Cambridge 
  Aug. 
  25 
  and 
  

   28. 
  There 
  remains 
  of 
  it 
  a 
  bit 
  of 
  the 
  thorax, 
  bearing 
  the 
  greater 
  part 
  of 
  

   one 
  fore 
  wing. 
  The 
  venation 
  of 
  this 
  wing 
  furnished 
  the 
  only 
  points 
  for 
  

   critical 
  comparison 
  with 
  my 
  specimens. 
  The 
  descriptions 
  and 
  the 
  type 
  

   specimens 
  agree 
  fairly 
  well 
  with 
  the 
  smallest 
  of 
  my 
  specimens. 
  I 
  could 
  

   not 
  see 
  the 
  brownish 
  color 
  of 
  the 
  veins 
  described 
  by 
  Eaton 
  either 
  in 
  my 
  

   specimens 
  or 
  in 
  the 
  type. 
  Also 
  the 
  veins 
  in 
  the 
  pterostigmatic 
  space 
  

   vary 
  in 
  number 
  in 
  my 
  specimens 
  from 
  5 
  to 
  12, 
  and 
  from 
  being 
  simple 
  

   and 
  straight 
  to 
  being 
  forked 
  and 
  anastomosing. 
  

  

  This 
  species, 
  like 
  the 
  preceding, 
  was 
  common 
  in 
  the 
  hatchery 
  

   windows, 
  was 
  taken 
  often 
  sparingly 
  in 
  the 
  trap 
  lanterns, 
  and 
  was 
  seldom 
  

   seen 
  at 
  large. 
  Imagos 
  occurred 
  more 
  sparingly, 
  however, 
  through 
  the 
  

   earlier 
  part 
  of 
  the 
  season, 
  but 
  they 
  became 
  very 
  abundant 
  in 
  August. 
  

   From 
  the 
  window 
  in 
  the 
  hatchery 
  nearest 
  the 
  mouth 
  of 
  the 
  inflow 
  pipe 
  

   carrying 
  surface 
  water, 
  hundreds 
  of 
  imagos 
  and 
  subimagos 
  could 
  be 
  

   picked 
  at 
  a 
  time. 
  These 
  were 
  preyed 
  on 
  in 
  great 
  numbers 
  by 
  spiders 
  

   which 
  lurked 
  in 
  the 
  crevices 
  of 
  the 
  window 
  casings. 
  Not 
  a 
  few 
  flew 
  

   against 
  the 
  window 
  panes 
  when 
  these 
  were 
  wet 
  with 
  condensations 
  in 
  

   the 
  mornings, 
  and, 
  striking 
  their 
  wings, 
  adhered, 
  and 
  were 
  unable 
  to 
  

   free 
  themselves. 
  When 
  the 
  moisture 
  evaporated, 
  these 
  were 
  dried 
  down 
  

   on 
  the 
  glass. 
  Among 
  these 
  I 
  noticed 
  a 
  number 
  of 
  females 
  which 
  had 
  

   discharged 
  the 
  contents 
  of 
  their 
  ovaries 
  on 
  the 
  pane 
  in 
  masses 
  of 
  about 
  

   200 
  eggs 
  each. 
  

  

  Nymphs 
  of 
  this 
  species 
  were 
  found 
  most 
  abundantly 
  among 
  the 
  cases 
  

   of 
  Simulium 
  pupae 
  in 
  swiftly 
  flowing 
  water; 
  a 
  few 
  could 
  be 
  taken 
  at 
  any 
  

   time 
  from 
  the 
  hatchery 
  troughs. 
  

  

  This 
  is 
  the 
  daintiest, 
  and 
  one 
  of 
  the 
  prettiest 
  of 
  our 
  May 
  flies. 
  It 
  is 
  

   still 
  so 
  insufficiently 
  known 
  that 
  I 
  will 
  append 
  hereto 
  complete 
  descrip- 
  

   tions 
  of 
  the 
  stages 
  known 
  to 
  me. 
  

  

  Male 
  imago. 
  Length 
  3-5 
  mm; 
  setae 
  7 
  mm 
  additional. 
  Colors 
  

   black 
  and 
  white 
  varied 
  with 
  reddish 
  brown 
  and 
  yellowish 
  red. 
  Head 
  

   yellowish, 
  with 
  the 
  ocelli 
  and 
  the 
  inferior 
  part 
  of 
  the 
  eyes 
  black, 
  turbi- 
  

   nate 
  superior 
  part 
  of 
  the 
  eyes 
  yellowish 
  red 
  on 
  the 
  sides, 
  reddish 
  brown 
  

   on 
  the 
  superior, 
  corneal 
  surface. 
  

  

  Thorax 
  black, 
  paler 
  on 
  the 
  lateral 
  sutures. 
  Legs, 
  antennae 
  and 
  setae 
  

   pale 
  yellowish 
  white; 
  fore 
  legs 
  darker 
  on 
  the 
  sutures. 
  Wing 
  very 
  trans- 
  

   parent 
  with 
  a 
  faint 
  wash 
  of 
  yellow 
  on 
  the 
  extreme 
  base. 
  Hind 
  wing 
  

   bivenulatCj 
  sometimes 
  with 
  a 
  short 
  third 
  vein. 
  

  

  