﻿312 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  The 
  mesopleurites 
  (Fig. 
  — 
  ) 
  are 
  very 
  oblique. 
  The 
  episternum 
  is 
  di- 
  

   vided 
  into 
  two 
  sclerites, 
  the 
  upper 
  one 
  third 
  as 
  long 
  as 
  the 
  lower 
  and 
  

   scale-like; 
  the 
  lower 
  oblong, 
  narrow, 
  very 
  long, 
  and 
  on 
  the 
  sternal 
  

   margin 
  bent 
  down 
  next 
  to 
  the 
  sternite. 
  The 
  epimeram 
  is 
  divided 
  into 
  

   a 
  long, 
  narrow, 
  linear, 
  chitinous 
  portion 
  next 
  to 
  the 
  episternum,, 
  the 
  

   posterior 
  portion 
  lying 
  in 
  front 
  of 
  the 
  metathorax. 
  

  

  Between 
  the 
  lower 
  end 
  of 
  the 
  episternum 
  and 
  coxa 
  is 
  a 
  small, 
  trian- 
  

   gular 
  sclerite 
  which 
  I 
  suppose 
  is 
  the 
  trochantine. 
  The 
  coxa 
  is 
  very 
  

   large, 
  long 
  and 
  quadrangular. 
  

  

  Metapleurites 
  as 
  the 
  mesopleurites, 
  but 
  the 
  sub-episternum 
  is 
  a 
  little 
  

   wider, 
  and 
  the 
  sur-episternum 
  is 
  longer, 
  while 
  the 
  epimerum 
  is 
  almost 
  

   wholly 
  membranous. 
  The 
  trochantine? 
  is 
  more 
  distinct 
  than 
  in 
  the 
  

   mesothorax. 
  The 
  coxa 
  is 
  of 
  the 
  same 
  form 
  as 
  in 
  mesothorax, 
  but 
  a 
  

   little 
  thicker. 
  

  

  Sternum. 
  

  

  The 
  prosternum 
  (Figs. 
  1-3) 
  is 
  divided 
  into 
  a 
  prse- 
  and 
  poststernite, 
  the 
  

   latter 
  remarkably 
  long. 
  

  

  The 
  mesosternum 
  is 
  narrow, 
  triangular, 
  flat; 
  the 
  apex 
  bordered 
  on 
  each 
  

   side 
  with 
  a 
  lateral 
  sternal 
  fold 
  of 
  the 
  integument. 
  

  

  Metasteriium. 
  A 
  large 
  part 
  of 
  the 
  sternal 
  surface 
  is 
  occupied 
  by 
  the 
  

   sternal 
  portions 
  of 
  the 
  episterna, 
  which 
  are 
  bent 
  beneath 
  the 
  body. 
  

   The 
  sternal 
  area 
  is 
  broader 
  and 
  longer 
  than 
  in 
  the 
  mesosternum, 
  but 
  the 
  

   limits 
  of 
  the 
  sternite 
  itself 
  are 
  less 
  definite; 
  it 
  appears 
  to 
  be 
  a 
  long, 
  

   narrow, 
  lanceolate-oval 
  area 
  (but 
  this 
  part 
  needs 
  further 
  comparative 
  

   study, 
  with 
  more 
  material 
  in 
  species 
  than 
  we 
  possess). 
  

  

  THE 
  ABDOMEN. 
  

  

  There 
  are 
  ten 
  segments 
  or 
  uromeres, 
  with 
  ten 
  tergites. 
  The 
  cerco- 
  

   poda 
  arise 
  from 
  the 
  tenth 
  segment. 
  They 
  are 
  stout, 
  many 
  jointed, 
  and 
  

   much 
  as 
  in 
  Blatta, 
  only 
  longer. 
  There 
  are 
  but 
  six 
  urosternites. 
  The 
  

   eight 
  pairs 
  of 
  stigmata 
  are 
  situated 
  on 
  the 
  membranous 
  pleurites. 
  

  

  Eemarks. 
  Mantis 
  is 
  a 
  genuine 
  Orthopter 
  in 
  venation 
  as 
  well 
  as 
  in 
  

  

  the 
  fundamental 
  structure 
  of 
  the 
  body, 
  and 
  is 
  truly 
  intermediate 
  in 
  its 
  

  

  structure 
  between 
  the 
  Acrydii 
  and 
  the 
  Blattariae, 
  approximating 
  the 
  

  

  latter 
  in 
  the 
  structure 
  of 
  the 
  head, 
  mouth-parts, 
  prothorax, 
  the 
  shape 
  

  

  of 
  the 
  abdomen, 
  an(f 
  its 
  appendages. 
  Blatta, 
  in 
  part, 
  may 
  be 
  regarded 
  

  

  as 
  the 
  ancestral 
  or 
  stem 
  form 
  of 
  the 
  Orthoptera, 
  from 
  which 
  all 
  the 
  

  

  other 
  Orthoptera 
  may 
  have 
  descended; 
  and 
  this 
  accords 
  in 
  the 
  main 
  

  

  with 
  the 
  geological 
  succession 
  of 
  the 
  different 
  Orthopterous 
  families 
  so 
  

  

  far 
  as 
  we 
  know 
  it. 
  

  

  Phasmida. 
  

  

  THE 
  HEAD. 
  

  

  Diapheromera 
  femoraUim. 
  Pupa. 
  The 
  head 
  (PI. 
  XXY, 
  XXVI) 
  is 
  

   small, 
  narrow, 
  nearly 
  horizontal, 
  subcylindrical. 
  The 
  epicrauium 
  is 
  

  

  