﻿344 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  The 
  pleurites 
  are 
  membranous, 
  broad, 
  having 
  the 
  spiracles, 
  of 
  which 
  

   there 
  are 
  eight 
  pairs 
  as 
  usual, 
  the 
  last 
  pair 
  minute. 
  

  

  Fig. 
  (in 
  text) 
  represents 
  the 
  end 
  of 
  the 
  abdomen 
  of 
  the 
  male 
  of 
  

   Panorpa. 
  

  

  Suborder 
  2. 
  Trichoptera. 
  Plates 
  LIX, 
  figs. 
  1-5 
  5 
  LX 
  I. 
  

  

  LimnepMlus.^^^ 
  (PI. 
  LIX, 
  figs. 
  1-5.) 
  The 
  head 
  differs 
  from 
  all 
  other 
  

   Phyloptera 
  in 
  being 
  constructed 
  on 
  a 
  plan 
  closely 
  approaching 
  that 
  of 
  

   the 
  lepidoptera. 
  It 
  is 
  short 
  and 
  high, 
  and 
  of 
  the 
  general 
  proportions 
  

   of 
  the 
  lepidopterous 
  head. 
  The 
  vertex 
  is 
  as 
  long 
  as 
  broad 
  j 
  the 
  orbits 
  

   wide. 
  The 
  clypeus 
  is 
  small, 
  narrow, 
  and 
  situated 
  high 
  upj 
  the 
  labrum 
  

   (Fig. 
  5) 
  is 
  small, 
  narrow, 
  elongate, 
  sub 
  triangular. 
  (The 
  exact 
  differ- 
  

   ences 
  from 
  the 
  Lepidopterous 
  head 
  are 
  stated 
  in 
  the 
  American 
  Naturalist 
  j 
  

   ^OY. 
  1871, 
  vol. 
  V, 
  p. 
  711.) 
  The 
  mandibles 
  are 
  not 
  present 
  in 
  Limne- 
  

   philus, 
  unless 
  a 
  slight 
  pointed 
  tubercle 
  on 
  each 
  side 
  of 
  the 
  lower 
  part 
  of 
  

   the 
  orbits 
  (Fig. 
  — 
  , 
  md 
  f) 
  may 
  represent 
  them. 
  If 
  so, 
  they 
  are 
  consolidated 
  

   with 
  the 
  epicranium, 
  but 
  I 
  am 
  inclined 
  to 
  think 
  that 
  these 
  do 
  not 
  repre- 
  

   sent 
  the 
  mandibles 
  at 
  all, 
  as 
  rudimentary 
  mandibles 
  in 
  the 
  form 
  of 
  a 
  

   movable 
  tubercle 
  are 
  to 
  be 
  seen 
  in 
  Neuronia 
  on 
  each 
  side 
  of 
  the 
  base 
  of 
  

   the 
  labrum.1^0 
  o 
  

  

  The 
  maxillary 
  palpi 
  (Fig. 
  5) 
  are 
  long 
  and 
  slender, 
  directed 
  down- 
  

   wardj 
  the 
  lobe 
  on 
  the 
  side 
  (Fig 
  4, 
  lac.) 
  hangs 
  down. 
  It 
  may 
  perhaps 
  

   be 
  the 
  homologue 
  of 
  the 
  lacinia. 
  The 
  labial 
  palpi 
  are 
  three-jointed 
  (Fig. 
  

   5), 
  while 
  the 
  mentum, 
  palpiger, 
  and 
  an 
  undivided 
  rudimentary 
  ligula 
  

   are 
  present. 
  

  

  The 
  gen 
  86 
  are 
  broad 
  on 
  the 
  under 
  side, 
  while 
  the 
  gular 
  region 
  is 
  nar- 
  

   row. 
  The 
  submentum 
  is 
  small 
  and 
  narrow 
  ; 
  the 
  mentum 
  is 
  trape 
  

   zoidal, 
  broadest 
  in 
  front. 
  

  

  THE 
  thorax. 
  

  

  Li7nnephilus. 
  The 
  pronotum 
  (PI. 
  LXI, 
  flg. 
  1) 
  is 
  much 
  as 
  in 
  Lepidopt- 
  

   era, 
  being 
  divided 
  into 
  two 
  transversely 
  oval, 
  narrow 
  bosses 
  by 
  a 
  deep 
  

   median 
  suture. 
  

  

  Mesonotum. 
  (Fig. 
  2.) 
  The 
  patagia 
  are 
  thick, 
  solid, 
  rounded 
  oval 
  ; 
  

   longer 
  than 
  broad. 
  The 
  prsescutum 
  is 
  obsolete. 
  

  

  The 
  scutum 
  is 
  long 
  and 
  broad, 
  with 
  a 
  prominent 
  acute 
  angle 
  in 
  the 
  

   middle 
  on 
  each 
  side. 
  Surface 
  with 
  a 
  deeply-impressed 
  median 
  line 
  ex- 
  

   tending 
  to 
  the 
  scutellum, 
  and 
  with 
  a 
  parallel, 
  lateral 
  impressed 
  line. 
  

   In 
  general 
  form 
  there 
  is 
  a 
  close 
  approximation 
  to 
  the 
  lepidopterous 
  

   mesoscutum. 
  It 
  is 
  deeply 
  excavated 
  behind 
  for 
  the 
  reception 
  of 
  the 
  

   scutellum, 
  which 
  is 
  large, 
  a 
  little 
  longer 
  than 
  broad, 
  and 
  sub 
  triangular. 
  

   The 
  postscuteUum 
  is 
  either 
  wanting 
  or 
  it 
  may 
  be 
  represented 
  by 
  a 
  

   transverse 
  ridge. 
  

  

  The 
  metanotum 
  (Fig. 
  3) 
  is 
  much 
  as 
  in 
  the 
  lepidopterous 
  type. 
  It 
  is 
  

  

  '^^A 
  common 
  species, 
  L. 
  pudicus 
  Hag. 
  ; 
  identified 
  by 
  Dr. 
  Hagen. 
  

  

  160 
  In 
  Neuronia 
  they 
  appear 
  to 
  be 
  nearly 
  of 
  the 
  same 
  form 
  as 
  represented 
  by 
  Savi.gny 
  in 
  Prhyganea 
  

   grandis 
  (M6moires 
  sur 
  les 
  Animaux 
  sans 
  Vert^bies. 
  PI. 
  I, 
  Pig. 
  1.) 
  In 
  the 
  papa 
  the 
  mandibles 
  are 
  

   much 
  larger. 
  

  

  