﻿PSEUDONEUROPTERA. 
  323 
  

  

  fourth 
  as 
  long 
  as 
  broad 
  5 
  eyes 
  on 
  each 
  side 
  5 
  no 
  orbits 
  5 
  the 
  ocellar 
  area 
  

   separated 
  from 
  the 
  vertex 
  by 
  a 
  well-marked 
  suture, 
  broad, 
  somewhat 
  Y-^ 
  

   shaped. 
  Separated 
  from 
  the 
  third 
  area 
  in 
  front 
  by 
  a 
  deeply-impressed 
  

   line. 
  

  

  Clypeus 
  narrow, 
  one-half 
  as 
  long 
  as 
  wide, 
  with 
  a 
  narrow 
  projection 
  

   in 
  front. 
  Labrum 
  small, 
  narrow, 
  short, 
  and 
  partly 
  fleshy. 
  Geuai 
  of 
  

   moderate 
  extent. 
  Gula 
  but 
  slightly 
  developed 
  5 
  meutum 
  short, 
  distinct 
  

   from 
  the 
  submentum. 
  

  

  THE 
  THORAX. 
  

  

  JSFotum. 
  

  

  Pronotum 
  {Pteronarcys 
  californica), 
  (PL 
  LVII, 
  fig. 
  1.) 
  Broad 
  and 
  

   square, 
  nearly 
  as 
  long 
  as 
  broad. 
  

  

  Mesonotum 
  {Pteronarcys 
  californica), 
  (Fig. 
  2.) 
  Prsescutum 
  sub-cor- 
  

   date, 
  rhomboidal, 
  with 
  the 
  posterior 
  half 
  triangular, 
  divided 
  by 
  a 
  deep 
  

   mesial 
  impressed 
  linej 
  anterior 
  half 
  smooth 
  and 
  swollen. 
  Patagia 
  (!) 
  

   large 
  and 
  broad. 
  

  

  Scutum 
  very 
  peculiar. 
  It 
  is 
  broader 
  than 
  long, 
  with 
  two 
  large 
  lateral 
  

   bosses 
  in 
  front, 
  apparently' 
  corresponding 
  to 
  the 
  two 
  halves 
  of 
  the 
  scu- 
  

   tum 
  in 
  the 
  Neuroptera 
  metamorphotica, 
  and 
  between 
  them 
  is 
  a 
  broad, 
  

   slightly 
  convex 
  area, 
  which 
  might 
  be 
  regarded 
  as 
  the 
  anterior 
  part 
  of 
  

   the 
  scutellum, 
  but 
  judging 
  by 
  the 
  limits 
  of 
  the 
  metascutellum 
  it 
  is 
  not. 
  

  

  Scutellum 
  short 
  and 
  broad, 
  well 
  marked 
  behind, 
  but 
  in 
  front 
  insen- 
  

   sibly 
  merging 
  into 
  the 
  central 
  flat 
  area 
  of 
  the 
  scutum, 
  with 
  no 
  indica- 
  

   tions 
  of 
  a 
  suture. 
  

  

  Postscutellum, 
  forming 
  a 
  transverse 
  linear 
  ridge 
  of 
  even 
  width 
  

   throughout, 
  with 
  very 
  slight 
  indications 
  of 
  an 
  impressed 
  line 
  along 
  the 
  

   middle 
  of 
  the 
  body. 
  

  

  Metanotum. 
  (Fig. 
  3.) 
  Exactly 
  repeats 
  the 
  form 
  of 
  the 
  mesonotum, 
  

   and 
  is, 
  if 
  anything, 
  a 
  little 
  longer 
  than 
  the 
  mesonotum 
  (the 
  hind 
  wings 
  

   being 
  considerably 
  larger). 
  Only 
  the 
  posterior 
  half 
  of 
  the 
  prtTescutum 
  

   in 
  the 
  mesonotum 
  is 
  represented 
  in 
  the 
  metanotum, 
  i. 
  e., 
  the 
  cordate, 
  

   roughened 
  portion, 
  with 
  the 
  mesial 
  suture. 
  The 
  lateral 
  bosses 
  of 
  the 
  

   scutum 
  are 
  as 
  far 
  asunder 
  as 
  in 
  the 
  mesonotum. 
  Scutellum 
  crescent- 
  

   shaped; 
  the 
  suture 
  in 
  front 
  is 
  distinct, 
  whereas 
  in 
  the 
  mesonotum 
  it 
  is 
  

   obsolete.^^^ 
  

  

  Postscutellum 
  a 
  little 
  larger 
  behind 
  the 
  scutellum 
  than 
  in 
  the 
  meso- 
  

   notum. 
  

  

  Behind 
  the 
  metapostscutellum 
  is 
  a 
  long, 
  transverse, 
  rather 
  broad 
  mem- 
  

   brane 
  which 
  connects 
  the 
  metanotum 
  with 
  the 
  abdomen. 
  It 
  is 
  not 
  the 
  

   first 
  abdominal 
  segment. 
  

  

  Pleurmn. 
  

  

  Propleurum 
  (Pteronarcys 
  californica) 
  . 
  (PI. 
  XLI 
  Y, 
  Fig. 
  1.) 
  Epistern 
  um 
  

   and 
  epimerum 
  both 
  nearly 
  equally 
  developed; 
  the 
  former 
  sub 
  triangular, 
  

   the 
  latter 
  subquadrate, 
  and 
  each 
  in 
  part 
  semi-membranous. 
  

  

  152 
  In 
  Acroneuria 
  abnormis 
  the 
  meso- 
  and 
  metascutellum 
  are 
  not 
  separated 
  by 
  suture 
  from 
  the 
  

   scutum. 
  

  

  