﻿12 
  PROCEEDINGS 
  OP 
  THE 
  NATIONAL 
  MUSEUM 
  vou 
  67 
  

  

  therefore 
  less 
  specialized 
  according 
  to 
  a 
  prevalent 
  view 
  of 
  the 
  sub- 
  

   ject, 
  there 
  can 
  be 
  little 
  doubt 
  that 
  this 
  specialization 
  is 
  secondary, 
  

   for 
  there 
  is 
  no 
  probability 
  that 
  an 
  insect 
  participating 
  in 
  the 
  long 
  

   course 
  of 
  evolution 
  of 
  so 
  specialized 
  a 
  group 
  as 
  the 
  Ploiariinae 
  could 
  

   carry 
  along 
  the 
  whole 
  route 
  a 
  primitive 
  type 
  of 
  venation. 
  

  

  Theoretical 
  considerations 
  are 
  involved 
  also 
  in 
  the 
  question 
  as 
  to 
  

   whether 
  the 
  possession 
  of 
  2-segmented 
  fore-tarsi 
  (a 
  nymphal 
  charac- 
  

   ter) 
  is 
  a 
  forward- 
  or 
  a 
  backward-looking 
  specialization. 
  Despite 
  the 
  

   fact 
  that 
  it 
  would 
  appear 
  to 
  be 
  a 
  step 
  toward 
  greater 
  predatory 
  

   effectiveness 
  we 
  have 
  been 
  obliged 
  to 
  give 
  greater 
  weight 
  to 
  certain 
  

   other 
  characters 
  when 
  the 
  whole 
  organization 
  of 
  a 
  genus 
  having 
  

   3-segmented 
  fore 
  tarsi 
  seemed 
  to 
  be 
  more 
  perfectly 
  fitted 
  for 
  preda- 
  

   tion. 
  

  

  We 
  have 
  endeavored 
  to 
  strike 
  a 
  fair 
  balance 
  among 
  the 
  characters 
  

   entitled 
  to 
  consideration 
  in 
  settling 
  upon 
  a 
  systematic 
  arrangement, 
  

   and 
  believe 
  we 
  have 
  been 
  in 
  a 
  better 
  position 
  for 
  so 
  doing 
  than 
  our 
  

   predecessors 
  because 
  of 
  the 
  much 
  larger 
  amount 
  of 
  material 
  ex- 
  

   amined. 
  

  

  Fore 
  tarsi 
  segmented. 
  

  

  Fore 
  femora 
  without 
  spines 
  or 
  bristles 
  ; 
  fore 
  tarsi 
  2-segmented 
  ; 
  forewing 
  

   reticulate 
  toward 
  base, 
  with 
  about 
  5-6 
  discal 
  cells. 
  Emesopsis 
  (p. 
  13). 
  

   Fore 
  femora 
  with 
  spines 
  or 
  bristles; 
  forewing 
  (when 
  present) 
  with 
  

   fewer 
  discal 
  cells. 
  

   Fore 
  femora 
  s-pined 
  for 
  almost 
  their 
  whole 
  length 
  ; 
  fore 
  tibiae 
  rela- 
  

   tively 
  long. 
  

   Fore 
  tarsi 
  2-segmented. 
  

  

  Fore 
  tarsi 
  not 
  heavily 
  chitinized, 
  basal 
  segment 
  the 
  shorter, 
  claws 
  

   equal; 
  apices 
  of 
  meso- 
  and 
  meta-thoraces, 
  each 
  usually 
  bearing 
  

   a 
  spine. 
  

   Forewing 
  with 
  one 
  discal 
  cell 
  ; 
  prothorax 
  scarcely 
  constricted. 
  

  

  Empicoris 
  (p. 
  13). 
  

   Forewing 
  with 
  two 
  discal 
  cells 
  ; 
  prothorax 
  deeply 
  constricted 
  or 
  

  

  pedicillate 
  Stenolemus 
  (p. 
  25). 
  

  

  Fore 
  tarsi 
  heavily 
  chitinized, 
  segments 
  subfused, 
  subequal, 
  claws 
  un- 
  

   equaled 
  ; 
  meso- 
  and 
  meta-thoraces 
  without 
  spines 
  ; 
  forewing 
  with 
  

  

  3 
  discal 
  cells 
  Deliastes 
  (p. 
  34). 
  

  

  Fore 
  tarsi 
  3-segmented. 
  

  

  Fore 
  tarsi 
  usually 
  flexible, 
  hairy, 
  at 
  least 
  above, 
  claws 
  equal. 
  

   Meso- 
  and 
  meta-notum 
  each 
  with 
  a 
  spine 
  ; 
  fore 
  wing 
  with 
  2 
  discal 
  

  

  cells 
  Polauchenia 
  (p. 
  47). 
  

  

  Meso- 
  and 
  meta-nota 
  unspined. 
  

  

  Fore 
  wing 
  with 
  3 
  discal 
  cells 
  Emesa 
  (p. 
  38). 
  

  

  Fore 
  wing 
  with 
  1 
  discal 
  cell 
  Panamia 
  (p. 
  36). 
  

  

  Lutevopsis 
  (p. 
  37). 
  

   Fore 
  tarsi 
  inflexible, 
  polished, 
  sutures 
  inconspicuous, 
  claws 
  usually 
  

   unequal 
  ; 
  fore-wing 
  when 
  present 
  with 
  1 
  discal 
  cell. 
  

  

  Ploiaria 
  (p. 
  48). 
  

   Fore 
  femora 
  spined 
  on 
  distal 
  half; 
  fore 
  tibiae 
  relatively 
  shorter; 
  fore 
  

  

  wing 
  with 
  1 
  discal 
  cell 
  Gardena 
  (p. 
  66). 
  

  

  Emesaya 
  (p. 
  74). 
  

  

  