﻿ORTHOPTERA. 
  317 
  

  

  THE 
  THORAX. 
  

  

  Notum. 
  

  

  Pronotum. 
  (PI. 
  XXYIIT.) 
  The 
  prothorax 
  is 
  remarkably 
  long, 
  cylin- 
  

   drical, 
  and 
  full 
  in 
  the 
  middle. 
  It 
  is 
  very 
  singular 
  for 
  having 
  no 
  sternum 
  as 
  

   distinguished 
  from 
  the 
  tergum, 
  but 
  the 
  segment 
  is 
  perfectly 
  cylindrical, 
  

   with 
  only 
  a 
  fine, 
  lateral, 
  straight 
  suture, 
  which 
  is 
  obsolete 
  behind 
  the 
  

   legs; 
  while 
  aloug 
  the 
  sternal 
  region 
  behind 
  the 
  legs 
  there 
  is 
  a 
  median, 
  

   fine 
  suture. 
  The 
  episternurn 
  is 
  present, 
  but 
  no 
  epimerutn 
  is 
  ditfer- 
  

   entiated 
  from 
  the 
  tergum. 
  The 
  anterior 
  spiracles 
  are 
  situated 
  on 
  tlie 
  

   front 
  edge 
  of 
  the 
  mesothorax, 
  and 
  these 
  are 
  really 
  the 
  usual 
  prothoracic 
  

   ones, 
  while 
  there 
  is 
  another 
  pair 
  on 
  the 
  hind 
  edge 
  of 
  the 
  mesothorax 
  on 
  

   the 
  rudimentary 
  mesepimeruai. 
  

  

  The 
  mesoRotum 
  (PI. 
  XXX) 
  consists 
  of 
  a 
  single 
  oblong 
  sclerite, 
  one 
  

   third 
  longer 
  than 
  broad, 
  very 
  slightly 
  separated 
  from 
  the 
  pleurum; 
  the 
  

   surface 
  is 
  rounded 
  and 
  rough 
  like 
  the 
  rest 
  of 
  the 
  segment. 
  

  

  The 
  metanotum 
  (PI. 
  XXX) 
  consists 
  of 
  two 
  portions 
  which 
  have 
  no 
  re- 
  

   sembliince 
  to 
  a 
  scutum 
  and 
  scutelluin, 
  but 
  which 
  are 
  separated 
  on 
  the 
  

   side 
  by 
  a 
  div^erging 
  ridge 
  extending 
  down 
  the 
  sides 
  into 
  the 
  epimerum; 
  

   the 
  anterior 
  area 
  is 
  short, 
  transversely 
  broad, 
  while 
  the 
  posterior 
  area 
  

   is 
  not 
  separated 
  by 
  suture 
  from 
  the 
  anterior, 
  but 
  is 
  as 
  long 
  as 
  broad, 
  

   and 
  rounded 
  in 
  front. 
  It 
  is 
  interesting 
  to 
  notice 
  the 
  extreme 
  modifica- 
  

   tion 
  of 
  the 
  meso- 
  and 
  metanotum, 
  owing 
  to 
  the 
  absence 
  of 
  wings, 
  and 
  

   also 
  those 
  characteristics 
  due 
  to 
  the 
  cylindrical 
  form 
  of 
  the 
  body. 
  Pros- 
  

   copia 
  is 
  a 
  link 
  between 
  the 
  Acrydii 
  and 
  the 
  Phasmida. 
  

  

  Fleurum. 
  

  

  The 
  mesopleurites 
  (PI. 
  XXXT) 
  are 
  well 
  marked 
  sclerites, 
  but 
  are 
  still 
  

   subordinated 
  in 
  form 
  and 
  relation 
  to 
  the 
  cylindrical 
  form 
  of 
  the 
  body. 
  

   They 
  are 
  oblique, 
  separated 
  by 
  a 
  fine 
  suture 
  from 
  the 
  tergum. 
  The 
  epi- 
  

   sternum 
  is 
  large 
  and 
  broad, 
  irregular 
  in 
  shape, 
  while 
  the 
  epimerum 
  is 
  

   much 
  shorter, 
  and 
  not 
  much 
  longer 
  than 
  wide. 
  The 
  pro-peritremes, 
  

   bearing 
  the 
  prostigmata, 
  are 
  separated 
  by 
  suture 
  from 
  the 
  prothorax, 
  

   and 
  the 
  meso-peritreme 
  is 
  consolidated 
  with 
  the 
  posterior 
  edge 
  of 
  the 
  

   mesepimerum. 
  

  

  The 
  mctapleurites 
  (PI. 
  XXXI) 
  are 
  much 
  as 
  in 
  the 
  mesothorax, 
  but 
  shor- 
  

   ter. 
  The 
  ei>isternuin 
  is 
  straight-edged; 
  though 
  oblique 
  in 
  its 
  general 
  

   position, 
  it 
  is 
  as 
  wide 
  as 
  in 
  the 
  mesothorax, 
  while 
  the 
  epimerum 
  is 
  less 
  

   than 
  half 
  as 
  wide 
  as 
  the 
  mesepimerum, 
  and 
  the 
  upper 
  portion 
  is 
  reduced 
  

   to 
  a 
  mere 
  ridge, 
  which 
  extends 
  upon 
  the 
  notum. 
  The 
  metacoxae 
  are 
  as 
  in 
  

   Diai)heron>era, 
  being 
  twice 
  as 
  large 
  as 
  those 
  of 
  the 
  mesothoracic 
  segment, 
  

   while 
  the 
  procoxiB 
  are 
  a 
  little 
  smaller 
  than 
  those 
  of 
  the 
  metathorax. 
  

  

  Sternum. 
  

  

  The 
  sfernifes 
  (PI. 
  XXXII) 
  are 
  broad 
  pieces, 
  the 
  meso- 
  and 
  metaster- 
  

   nites 
  not 
  separated 
  by 
  suture. 
  The 
  external 
  oi)euings 
  of 
  the 
  mes-ento- 
  

  

  