﻿DERMATOPTERA. 
  305 
  

  

  short, 
  broad 
  submentum 
  (and 
  in 
  front 
  of 
  tlie 
  prosternum) 
  is 
  a 
  free 
  sclerite, 
  

   witli 
  a 
  transverse, 
  median 
  impressed 
  line. 
  (Tliis 
  sclerite 
  may 
  be 
  called 
  

   the 
  postgula^ 
  and 
  it 
  may 
  correspond 
  to 
  the 
  praesternal 
  sclerite 
  in 
  Blatta, 
  

   excel) 
  t 
  that 
  no 
  pleural 
  sclerite 
  is 
  attached 
  to 
  it 
  as 
  in 
  Blatta.) 
  The 
  men- 
  

   tarn 
  is 
  very 
  large 
  and 
  flat, 
  as 
  long 
  as 
  broad. 
  

  

  THE 
  THORAX. 
  

  

  Notum. 
  

  

  Pronotum. 
  (Fig. 
  7.) 
  Large, 
  flat, 
  square, 
  a 
  little 
  longer 
  than 
  broad, 
  

   and 
  rounded 
  behind. 
  

  

  Mesonotum. 
  (Fig. 
  8.) 
  Somewhat 
  as 
  in 
  Termes, 
  being 
  almost 
  entirely 
  

   concealed 
  by 
  the 
  pronotum, 
  which 
  rides 
  over 
  it. 
  It 
  is 
  very 
  short 
  — 
  

   indeed, 
  remarkably 
  so 
  — 
  no 
  other 
  insects 
  approaching 
  this 
  group 
  in 
  this 
  

   respect, 
  while 
  tbe 
  metanotum 
  is 
  remarkably 
  developed. 
  Neither 
  the 
  

   meso- 
  nor 
  metanotum 
  are 
  so 
  wide 
  as 
  the 
  thorax, 
  a 
  broad 
  margin 
  of 
  mem- 
  

   brane 
  bordering 
  the 
  sides. 
  

  

  The 
  mesoscutum 
  forms 
  a 
  very 
  short, 
  transversely 
  sublinear 
  sclerite, 
  

   with 
  the 
  front 
  edge 
  full 
  and 
  curved, 
  but 
  linear 
  (in 
  a 
  transverse 
  sense) 
  

   on 
  the 
  sides 
  J 
  behind, 
  it 
  receives 
  the 
  minute, 
  diamond-shaped 
  scutellum, 
  

   which 
  forms 
  a 
  posterior, 
  spine 
  like 
  projection, 
  which 
  rubs 
  or 
  phiys 
  upon 
  

   the 
  medially 
  chitinous 
  front 
  edge 
  of 
  the 
  metanotum. 
  On 
  each 
  side 
  of 
  

   the 
  scutellum 
  is 
  a 
  transverse, 
  long, 
  lanceolate-oval, 
  chitinous 
  sclerite, 
  

   which 
  we 
  are 
  disposed 
  to 
  regard 
  as 
  the 
  divided 
  postscutellum. 
  There 
  

   is 
  no 
  praescutum, 
  and 
  in 
  front 
  of 
  and 
  behind 
  the 
  mesonotum 
  the 
  thorax 
  

   is 
  soft 
  and 
  membranous. 
  

  

  Metanotum. 
  (Fig. 
  8.) 
  There 
  is 
  no 
  praescutum. 
  The 
  scutum 
  is 
  very 
  

   large, 
  nearly 
  as 
  broad 
  as 
  long, 
  broad 
  in 
  front, 
  narrowing 
  behind, 
  sinuous 
  

   on 
  the 
  front 
  edge, 
  slightly 
  rounded 
  behind, 
  the 
  surface 
  generally 
  flat- 
  

   tened, 
  a 
  little 
  convex, 
  with 
  two 
  parallel, 
  slightly 
  converging 
  median 
  

   ridges 
  5 
  behind 
  these 
  two 
  ridges 
  is 
  the 
  narrow, 
  longitudinally 
  some- 
  

   what 
  oblong 
  scutellum. 
  It 
  is 
  not 
  defined 
  by 
  suture, 
  and 
  I 
  could 
  not 
  

   decide 
  what 
  it 
  was 
  until 
  I 
  ha(J 
  examined 
  Labia, 
  in 
  which 
  it 
  is 
  more 
  dis- 
  

   tinctly 
  separated 
  from 
  the 
  scutum; 
  it 
  is 
  thick, 
  dark, 
  with 
  a 
  si^ine-like 
  

   projection 
  in 
  front. 
  

  

  The 
  large, 
  long 
  and 
  broad, 
  more 
  or 
  less 
  flat 
  area 
  between 
  the 
  scutum 
  

   and 
  first 
  uromere 
  we 
  are 
  disposed 
  to 
  regard 
  as, 
  without 
  much 
  doubt, 
  

   an 
  enormously 
  developed 
  postscutellum, 
  especially 
  as 
  it 
  is 
  much 
  shorter 
  

   and 
  more 
  like 
  the 
  i)ostscutellum 
  of 
  Labia. 
  Its 
  surface 
  is 
  broken 
  up 
  

   into 
  areas; 
  from 
  behind 
  the 
  metascutellum 
  two 
  widely 
  diverging 
  ridges 
  

   pass 
  backward 
  and 
  outward 
  to 
  support 
  the 
  base 
  of 
  the 
  wings. 
  

  

  Fleurum, 
  

  

  The 
  pleurites 
  are 
  remarkable 
  for 
  being 
  extended 
  horizontally, 
  and 
  

   for 
  the 
  unusual 
  form 
  and 
  relations 
  of 
  the 
  epimera, 
  in 
  these 
  n^spects 
  

   suggesting 
  the 
  Ooleoptera, 
  and 
  perhaps 
  the 
  Staphylinidie. 
  The 
  legs 
  

   20 
  EO 
  

  

  