﻿550 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  and 
  mouth 
  parts 
  are 
  relatively 
  larger. 
  The 
  lateral 
  filaments 
  bear 
  two 
  

   spinules 
  at 
  their 
  apex, 
  the 
  posterior 
  one 
  minute. 
  Each 
  filament 
  shows 
  

   a 
  central 
  tracheal 
  branch, 
  without 
  distinguishable 
  tracheoles 
  and 
  with 
  a 
  

   rough 
  prkkly 
  surface 
  which 
  is 
  certainly 
  not 
  suggestive 
  of 
  a 
  respiratory 
  

   organ. 
  The 
  circulation 
  of 
  the 
  blood, 
  easily 
  seen 
  in 
  other 
  parts 
  of 
  the 
  

   body, 
  I 
  could 
  not 
  observe 
  in 
  these 
  at 
  all. 
  

  

  Respiratory 
  tubes 
  from 
  the 
  spiracles 
  of 
  the 
  eighth 
  abdominal 
  segment, 
  

   wide 
  apart, 
  short, 
  not 
  half 
  as 
  long 
  as 
  the 
  segment. 
  The 
  lateral 
  filaments 
  

   of 
  the 
  tenth 
  abdominal 
  segment 
  are 
  short, 
  bearing 
  three 
  setae, 
  of 
  which 
  

   the 
  two 
  exterior 
  are 
  longer 
  than 
  the 
  filament 
  itself: 
  filament 
  not 
  surpas- 
  

   sing 
  the 
  tips 
  of 
  the 
  claws. 
  The 
  two 
  longitudinal 
  tracheal 
  trunks 
  within 
  

   the 
  body 
  terminate 
  in 
  the 
  tubes 
  springing 
  from 
  the 
  spiracles 
  of 
  the 
  eighth 
  

   abdominal 
  segment, 
  but 
  they 
  are 
  much 
  stouter 
  anteriorly 
  where 
  passing 
  

   the 
  other 
  spiracles, 
  and 
  they 
  bend 
  distinctly 
  outward 
  to 
  meet 
  the 
  

   spiracles 
  of 
  the 
  prothorax. 
  

  

  Antennae 
  three-jointed, 
  the 
  second 
  joint 
  bearing 
  at 
  its 
  distal 
  end 
  ex- 
  

   teriorly 
  a 
  pair 
  of 
  spinules 
  close 
  beside 
  the 
  base 
  of 
  the 
  t^erminal 
  joint. 
  

  

  The 
  brevity 
  of 
  the 
  respiratory 
  tubules 
  on 
  the 
  eighth 
  abdominal 
  segment 
  

   is 
  doubtless 
  ancestral 
  ; 
  and 
  the 
  spinules 
  on 
  the 
  lateral 
  filaments 
  may 
  mean 
  

   that 
  these 
  filaments 
  are 
  but 
  modified 
  larval 
  setigerous 
  tubercles. 
  The 
  

   function 
  of 
  the 
  filaments 
  is 
  largely 
  locomotor; 
  they 
  are 
  used 
  as 
  fins 
  in 
  

   swimming. 
  But 
  they 
  are 
  also 
  "outriggers," 
  if 
  we 
  may 
  so 
  speak, 
  serving 
  

   to 
  maintain 
  the 
  proper 
  position 
  of 
  the 
  long 
  abdomen 
  while 
  crawling 
  

   about 
  over 
  submerged 
  logs. 
  

  

  Ch. 
  serricornis 
  was 
  first 
  taken 
  June 
  20, 
  and 
  was 
  quite 
  common 
  

   for 
  a 
  month 
  thereafter. 
  The 
  pupa 
  was 
  searched 
  for, 
  but 
  not 
  found. 
  

  

  Corydalis 
  

  

  Our 
  sole 
  species, 
  C. 
  cornuta 
  Linn, 
  is 
  too 
  well 
  known 
  to 
  need 
  

   another 
  description. 
  It 
  will 
  be 
  recognized 
  by 
  the 
  characters 
  stated 
  in 
  

   the 
  keys, 
  and 
  by 
  Dr 
  Lintner's 
  figures, 
  reproduced 
  herewith 
  as 
  Plate 
  28. 
  

  

  Family 
  he^/ierobiidae 
  

  

  This 
  family 
  has 
  received 
  little 
  attention 
  from 
  entomologists 
  in 
  America. 
  

   I 
  do 
  not 
  now 
  recall 
  a 
  single 
  American 
  species 
  whose 
  life 
  history 
  is 
  known 
  

   in 
  full. 
  A 
  single 
  species 
  supposed 
  to 
  be 
  aquatic 
  has 
  been 
  twice 
  reported 
  

   from 
  the 
  United 
  States 
  — 
  once 
  from 
  New 
  York 
  state. 
  It 
  is 
  gratifying 
  

   therefore 
  to 
  be 
  able 
  to 
  add 
  another 
  genus, 
  C 
  1 
  i 
  m 
  a 
  c 
  i 
  a 
  , 
  to 
  the 
  hst 
  of 
  

   aquatic 
  genera, 
  and 
  to 
  make 
  a 
  slight 
  contribution 
  to 
  the 
  knowledge 
  of 
  

   its 
  habits 
  and 
  life 
  history. 
  

  

  