﻿322 
  EEPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  THE 
  HEAD. 
  

  

  (Ecmithus 
  niveus 
  9 
  . 
  — 
  The 
  head 
  is 
  long 
  and 
  narrow. 
  The 
  suture 
  be- 
  

   tween 
  the 
  post- 
  and 
  anteclypeus 
  is 
  obsolete 
  in 
  the 
  middle. 
  The 
  occip- 
  

   ital 
  and 
  gular 
  regions 
  are 
  much 
  developed, 
  while 
  the 
  genae»are 
  narrow. 
  

  

  THE 
  THORAX. 
  

  

  I^otum. 
  

  

  The 
  pronotum 
  is 
  long 
  and 
  narrow. 
  

  

  The 
  mesonotum 
  is 
  very 
  short 
  5 
  the 
  scutum 
  almost 
  wanting, 
  very 
  short, 
  

   while 
  the 
  scutellum 
  is 
  about 
  one-third 
  as 
  long 
  as 
  wide. 
  

  

  The 
  metanotum 
  is 
  a 
  little 
  longer 
  than 
  wide 
  5 
  the 
  scutum 
  is 
  shorter 
  than 
  

   broad, 
  slightly 
  swollen 
  on 
  each 
  side 
  ; 
  the 
  scutellum 
  is 
  one-half 
  as 
  long 
  

   as 
  the 
  scutum, 
  unusually 
  broad, 
  regularly 
  convex, 
  very 
  obtusely 
  angu- 
  

   lar 
  behind, 
  succeeded 
  by 
  a 
  thin, 
  transverse 
  ridge, 
  which 
  is 
  perhaps 
  the 
  

   postscutellum. 
  

  

  Pleurum, 
  

  

  The 
  propleurum 
  is 
  minute 
  and 
  rudimentary. 
  

  

  The 
  mesopleurvm 
  is 
  very 
  short 
  and 
  obliquej 
  the 
  episternum 
  is 
  a 
  long- 
  

   oblong 
  sclerite 
  which 
  is 
  moderately 
  broad, 
  while 
  the 
  epimerum 
  is 
  very 
  

   narrow, 
  but 
  as 
  long 
  as 
  the 
  episternum. 
  

  

  The 
  meta/pleurum 
  is 
  also 
  very 
  oblique, 
  but 
  the 
  two 
  sclerites 
  are 
  of 
  the 
  

   same 
  width, 
  and 
  both 
  are 
  somewhat 
  broader 
  and 
  larger 
  than 
  the 
  mes- 
  

   episterna. 
  

  

  Sternum, 
  

  

  All 
  the 
  stern 
  ites 
  are 
  broad 
  and 
  full, 
  as 
  indicated 
  in 
  Fig. 
  , 
  so 
  that 
  the 
  

   coxae 
  are 
  wide 
  apart. 
  

  

  THE 
  ABDOMEN. 
  

  

  There 
  are 
  eleven 
  uromeres; 
  eleven 
  tergites, 
  and 
  eight 
  urosternites. 
  

   The 
  cercopoda'are 
  long, 
  multiarticulate, 
  while 
  the 
  ovipositor 
  is 
  large, 
  

   Igng, 
  and 
  well 
  developed. 
  

  

  Eemarlcs. 
  — 
  This 
  family 
  is 
  evidently 
  closely 
  allied 
  to 
  the 
  Locustarise, 
  

   while 
  the 
  Acrydii 
  and 
  Phasmida 
  are 
  closely 
  allied, 
  the 
  Mantidse 
  standing 
  

   below 
  next 
  to 
  the 
  lowest 
  group, 
  the 
  Blattariae. 
  

  

  Order 
  lY. 
  PSEUDONEUKOPTERA. 
  

  

  Suborder 
  1. 
  Oorrodentia. 
  

  

  Perlid^. 
  Plates 
  XL, 
  XLIY, 
  LYII. 
  

  

  the 
  head. 
  

  

  Pteronarcys 
  californica. 
  (PI. 
  XL, 
  figs. 
  1-2.) 
  No 
  occiput. 
  Epicranium 
  

   divided 
  into 
  three 
  regions; 
  vertex 
  large 
  and 
  well 
  marked, 
  about 
  one- 
  

  

  I 
  

  

  