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  distinctions. 
  That 
  of 
  4-punctata 
  (Fig. 
  5, 
  c) 
  is 
  dark 
  with 
  a 
  pair 
  of 
  sub- 
  

   quadrate 
  horn-like 
  processes 
  projecting 
  forward 
  between 
  the 
  eyes, 
  and 
  

   there 
  is 
  a 
  serrate 
  crest 
  along 
  the 
  middle 
  of 
  the 
  back 
  of 
  the 
  abdomen. 
  

   The 
  nymph 
  of 
  novella 
  (Fig. 
  6, 
  c) 
  is 
  similarly 
  crested, 
  and 
  the 
  top 
  of 
  

   the 
  head 
  projects 
  somewhat 
  upwards 
  but 
  scarcely 
  forward; 
  that 
  of 
  

   sanguinolenia 
  (Fig. 
  7, 
  c) 
  has 
  neither 
  crest 
  nor 
  cephalic 
  projections, 
  

   but 
  the 
  black 
  head-dots 
  are 
  visible. 
  The 
  nymph 
  of 
  iihleri 
  we 
  have 
  

   not 
  seen. 
  

  

  Of 
  the 
  third 
  group, 
  Oncometopla 
  undata 
  (Fig. 
  8) 
  is 
  a 
  full 
  half 
  inch 
  

   in 
  length, 
  the 
  wings 
  are 
  purplish, 
  and 
  the 
  head 
  and 
  scutellum 
  are 
  orange 
  

   reticulate 
  with 
  black. 
  Diedrocephala 
  versuta 
  is 
  about 
  three-sixteenths 
  

   of 
  an 
  inch 
  long, 
  dark 
  yellowish 
  green, 
  with 
  one 
  greenish 
  blue 
  and 
  two 
  

   orange 
  stripes 
  on 
  each 
  wing 
  and 
  some 
  marginal 
  black 
  dots 
  near 
  the 
  tip. 
  

   The 
  head 
  is 
  ornamented 
  above 
  with 
  a 
  yellowish 
  submarginal 
  stripe, 
  

   often 
  bluish, 
  and 
  one 
  down 
  the 
  middle, 
  both 
  sharply 
  defined 
  by 
  fine 
  

   black 
  lines. 
  Diedrocephala 
  mollipes 
  (Fig. 
  9), 
  a 
  very 
  common 
  species, 
  

   is 
  similar 
  to 
  the 
  foregoing 
  but 
  larger, 
  from 
  a 
  quarter 
  to 
  three-eighths 
  of 
  

   an 
  inch 
  long, 
  the 
  wings 
  dark 
  green 
  with 
  bluish 
  veins 
  and 
  yellow 
  edges, 
  

   the 
  head, 
  scutellum, 
  and 
  front 
  of 
  thorax 
  yellowish, 
  the 
  first 
  with 
  some 
  

   fine 
  black 
  lines 
  irregularly 
  placed. 
  Gypona 
  octolineata 
  is 
  a 
  broad, 
  

   oval, 
  straw-colored 
  species, 
  three-eighths 
  of 
  an 
  inch 
  long, 
  the 
  thorax 
  

   indefinitely 
  lined 
  with 
  yellow 
  or 
  reddish, 
  and 
  the 
  ocelli 
  bright, 
  but 
  

   pale 
  red. 
  

  

  The 
  last 
  and 
  largest 
  of 
  the 
  four 
  groups 
  is 
  difficult 
  of 
  satisfactory 
  

   analysis. 
  Among 
  the 
  larger 
  forms 
  Platymetopms 
  acutus 
  (Fig. 
  10) 
  is 
  

   bright 
  brown 
  with 
  ivory-whitish 
  spots 
  and 
  a 
  notably 
  broad 
  and 
  pointed 
  

   head. 
  The 
  wings 
  have 
  a 
  series 
  of 
  oblique 
  black 
  dashes 
  along 
  their 
  

   lower 
  edge, 
  and 
  are 
  so 
  shaped 
  that 
  they 
  diverge 
  behind 
  the 
  body 
  when 
  

   folded, 
  leaving 
  a 
  broad 
  notch 
  between 
  them 
  at 
  the 
  tip. 
  Eutettix 
  

   seminuda 
  has 
  a 
  short, 
  broadly 
  rounded 
  head 
  and 
  a 
  whitish 
  back 
  with 
  a 
  

   large 
  light 
  brown 
  saddle-mark. 
  Phlepsius 
  irroratus 
  (PI. 
  III., 
  Fig. 
  2) 
  

   is 
  whitish 
  with 
  a 
  very 
  fine 
  dark 
  brown 
  network 
  on 
  the 
  upper 
  surface, 
  

   giving 
  the 
  general 
  effect 
  of 
  a 
  uniform 
  light 
  brown 
  shade. 
  It 
  is 
  three- 
  

   sixteenths 
  of 
  an 
  inch 
  in 
  length, 
  or 
  more. 
  Deltocephalus 
  inimicus 
  (Fig. 
  

   12) 
  is 
  best 
  known 
  by 
  the 
  three 
  similar 
  pairs 
  of 
  large 
  black 
  dots, 
  one 
  on 
  

   the 
  head, 
  one 
  on 
  the 
  prothorax, 
  and 
  one 
  on 
  the 
  triangular 
  scutellum. 
  

   The 
  wings 
  have 
  a 
  whitish 
  ground-color 
  with 
  brown 
  margins 
  to 
  the 
  cells. 
  

  

  Among 
  the 
  small 
  green 
  species 
  Deltocephalus 
  melsheh?iert 
  {Y\g. 
  11) 
  is 
  

   gray-green 
  without 
  distinct 
  markings, 
  and 
  its 
  head 
  is 
  unusually 
  flat 
  and 
  

   triangular 
  above. 
  Deltocephalus 
  nigrifrons 
  (PI. 
  II., 
  Fig. 
  2) 
  has 
  a 
  row 
  

   of 
  six 
  small 
  black 
  and 
  nearly 
  equal 
  dots 
  along 
  the 
  front 
  of 
  the 
  head 
  as 
  

   seen 
  from 
  above, 
  and 
  the 
  face 
  is 
  barred 
  with 
  black. 
  The 
  two 
  species 
  

   of 
  Gnathodus 
  here 
  mentioned 
  are 
  plain 
  dark 
  green 
  with 
  very 
  short 
  heads, 
  

   the 
  surface 
  visible 
  from 
  above 
  having 
  the 
  form 
  of 
  a 
  curved 
  band 
  of 
  

  

  