﻿338 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  tergite. 
  The 
  mesosiernum 
  (fig. 
  17) 
  is 
  large, 
  eacli 
  half 
  subrhomboidal 
  and 
  

   passing 
  laterally, 
  forming 
  a 
  ridge 
  between 
  the 
  sur- 
  and 
  infra-episternites. 
  

   The 
  metasternum 
  (fig. 
  18) 
  is 
  much 
  as 
  in 
  the 
  mesosternum, 
  there 
  being 
  no 
  

   special 
  difference 
  in 
  form 
  or 
  size, 
  since 
  the 
  meso- 
  and 
  metathorax 
  are 
  of 
  

   the 
  same 
  size. 
  

  

  THE 
  ABDOMEN. 
  

  

  Corydalus. 
  The 
  $ 
  abdomen 
  (PI. 
  LYII, 
  figs. 
  4-5 
  ; 
  PI. 
  LYIII, 
  fig. 
  1) 
  is 
  not 
  

   very 
  loDg, 
  but 
  broad 
  and 
  thick; 
  ten 
  uromeres; 
  ten 
  tergites, 
  the 
  tenth 
  

   rudimentary 
  and 
  conical, 
  concealed 
  by 
  the 
  large 
  ninth 
  tergite, 
  which 
  is 
  

   cleft, 
  and 
  bears 
  two 
  pairs 
  of 
  large, 
  long 
  claspers, 
  which 
  are 
  jointed 
  to 
  

   the 
  tergite. 
  The 
  pleurites 
  are 
  narrow, 
  membranous. 
  There 
  are 
  eight 
  

   urosternites, 
  the 
  eighth 
  cleft 
  along 
  the 
  entire 
  length. 
  

  

  EapMdia. 
  The 
  9 
  abdomen 
  is 
  moderately 
  long, 
  broad, 
  spindle-shaped. 
  

   There 
  are 
  ten 
  uromeres 
  ; 
  ten 
  tergites, 
  the 
  tenth 
  small. 
  The 
  pleurites 
  

   are 
  well 
  developed, 
  but 
  narrow, 
  bearing 
  the 
  spiracles. 
  Of 
  the 
  urostern- 
  

   ites, 
  seven 
  are 
  well 
  developed, 
  and 
  the 
  ovipositor 
  is 
  remarkably 
  well 
  de- 
  

   veloped; 
  more 
  so 
  than 
  in 
  any 
  other 
  i^europtera 
  (PI. 
  LYIII, 
  fig. 
  5-7). 
  

  

  HEMEEOBIID^. 
  \ 
  

  

  o 
  \ 
  

  

  THE 
  HEAD. 
  

  

  Ascalaphus.^^'^ 
  (PI. 
  LI, 
  figs. 
  3-4.) 
  The 
  head 
  is 
  held 
  vertically; 
  it 
  is 
  

   broad 
  and 
  short; 
  the 
  eyes 
  are 
  very 
  large, 
  approaching 
  the 
  Odonata 
  in 
  

   this 
  respect, 
  and 
  are 
  double. 
  The 
  epicranium 
  is 
  small 
  and 
  narrow 
  on 
  the 
  

   vertex, 
  owing 
  to 
  the 
  large 
  eyes, 
  which 
  nearly 
  meet 
  above. 
  The 
  orbits 
  

   are 
  very 
  wide 
  in 
  front 
  of 
  the 
  eyes; 
  the 
  clypeus 
  broad, 
  double, 
  being 
  di- 
  

   vided 
  into 
  an 
  anterior 
  and 
  posterior 
  clypeus 
  ; 
  the 
  latter 
  is 
  smooth 
  and 
  

   flat, 
  transversely 
  oblong, 
  limited 
  on 
  the 
  sides 
  by 
  two 
  deep 
  linear 
  fossae; 
  

   the 
  anteclypeus 
  narrows 
  in 
  front 
  and 
  is 
  broadly 
  trai)ezoidal, 
  but 
  is 
  con- 
  

   siderably 
  shorter 
  than 
  the 
  postclypeus. 
  The 
  labrum 
  is 
  broad 
  and 
  very 
  

   short, 
  the 
  front 
  edge 
  a 
  little 
  excavated. 
  The 
  gense 
  are 
  large, 
  full, 
  and 
  

   swollen. 
  The 
  gular 
  region 
  is 
  depressed, 
  moderately 
  wide. 
  

  

  Myrmeleon 
  diversum 
  Hag.^^^ 
  (PI. 
  LI, 
  figs. 
  1, 
  2). 
  The 
  head 
  is 
  short 
  and 
  

   moderately 
  broad; 
  the 
  vertex 
  is 
  full 
  and 
  swollen 
  on 
  each 
  side 
  of 
  the 
  

   median 
  furrow. 
  No 
  ocelli, 
  and 
  no 
  ocellar 
  area, 
  the 
  latter 
  region 
  being 
  

   sunken 
  and 
  obsolete. 
  There 
  are 
  two 
  deep, 
  ante-antennal, 
  linear, 
  orbital 
  

   fossae 
  in 
  front 
  at 
  the 
  base 
  of 
  the 
  clypeus. 
  There 
  is 
  no 
  well-marked 
  clypeal 
  

   suture. 
  The 
  clypeus 
  is 
  a 
  little 
  shorter 
  than 
  broad, 
  the 
  posterior 
  and 
  

   anterior 
  divisions 
  being 
  slightly 
  indicated 
  by 
  a 
  ridge. 
  The 
  labrum 
  is 
  

   short 
  and 
  broad. 
  The 
  gula 
  is 
  broad 
  and 
  membranous. 
  

  

  Folystoechotes 
  nehulosus. 
  (PI. 
  LI, 
  figs. 
  8-10.) 
  The 
  head 
  is 
  of 
  the 
  same 
  

   shape 
  as 
  in 
  Myrmeleon, 
  but 
  the 
  vertex 
  is 
  entire, 
  full, 
  and 
  convex. 
  Ocelli 
  

   wanting, 
  but 
  the 
  ocellar 
  area 
  is 
  full, 
  raised, 
  though 
  not 
  well 
  defined. 
  

  

  "5J_. 
  longicornis 
  1 
  from 
  Ne-w 
  Jersey. 
  

  

  156 
  The 
  specimens 
  examined 
  were 
  from 
  Colorado. 
  I 
  am 
  indebted 
  to 
  Dr. 
  H. 
  Hagen 
  for 
  the 
  identifieatioH 
  

   of 
  the 
  species. 
  

  

  