﻿art. 
  1 
  AMERICAN 
  PLOIARIINAE 
  McATEE 
  AND 
  MALLOCH 
  11 
  

  

  14. 
  Head 
  normally 
  with 
  two 
  stout 
  tubercles 
  or 
  spines, 
  one 
  between 
  bases 
  of 
  

   antennae 
  and 
  the 
  other 
  (labrum) 
  above 
  base 
  of 
  proboscis 
  (fig. 
  139) 
  ; 
  pro- 
  

   notura 
  in 
  winged 
  form 
  overlapping 
  mesonotum 
  to 
  base 
  of 
  wings. 
  

  

  Metapterus 
  Costa 
  (Barce 
  Stal) 
  (p. 
  83). 
  

  

  Head 
  with 
  neither 
  of 
  the 
  above 
  mentioned 
  tubercles 
  or 
  spines 
  (fig. 
  140) 
  ; 
  

  

  pronotum 
  in 
  winged 
  forms 
  not 
  overlapping 
  mesonotum 
  except 
  at 
  anterior 
  

  

  extremity 
  Ischnonyctes 
  Stal 
  (Extralimital 
  *). 
  

  

  NOTES 
  ON 
  AMERICAN 
  GENERA 
  NOT 
  INCLUDED 
  IN 
  THE 
  

   FOREGOING 
  KEY. 
  

  

  Emesella 
  Dohrn, 
  Emesina. 
  I860, 
  p. 
  239. 
  [Monobasic, 
  E. 
  ncbulosa, 
  new 
  

   species, 
  genotype, 
  Bolivia, 
  pp. 
  239-240.] 
  From 
  the 
  original 
  description 
  it 
  is 
  

   impossible 
  to 
  determine 
  the 
  relationships 
  of 
  this 
  group. 
  If 
  Emesella 
  immitis 
  

   (Bergroth, 
  Ploeariinen, 
  1906, 
  pp. 
  312-314, 
  Venezuela) 
  really 
  is 
  congeneric, 
  

   we 
  should 
  say 
  from 
  inspection 
  of 
  imperfect 
  specimens 
  of 
  this 
  species, 
  that 
  

   Emesella 
  probably 
  would 
  place 
  in 
  our 
  classification 
  as 
  a 
  subgenus 
  of 
  Ghilianella 
  

   near 
  Lissonyx. 
  Signoret 
  adds 
  a 
  species 
  to 
  this 
  genus, 
  namely 
  E. 
  dohrni 
  

   Revision 
  des 
  Hemipteres 
  du 
  Chili, 
  Ann. 
  Soc. 
  Ent. 
  France, 
  ser. 
  4, 
  vol. 
  3, 
  1863, 
  

   pp. 
  587-588 
  [Chili]. 
  

  

  Malacopus 
  Stal, 
  C. 
  Bidrag 
  till 
  Rio 
  Janeiro-Traktens 
  Hemipter-Fauna, 
  1862, 
  

   pp. 
  80-81. 
  [Monobasic, 
  M. 
  cellular 
  is, 
  new 
  species 
  genotype, 
  Brazil.] 
  

  

  Palacus 
  Dohrn, 
  Nachtriige, 
  1863, 
  pp. 
  74-75 
  [Monobasic 
  P. 
  cubensis, 
  new 
  

   species 
  genotype, 
  Cuba, 
  p. 
  75.] 
  See 
  remarks 
  under 
  Dcliastcs 
  p. 
  34. 
  The 
  species 
  

   described 
  by 
  Guerin-Meneville 
  as 
  Ploiaria 
  pallida 
  is 
  put 
  in 
  Palacus 
  by 
  

   Lethierry 
  and 
  Severin, 
  Cat. 
  Gen. 
  Hemip., 
  vol. 
  3, 
  1896, 
  p. 
  74. 
  The 
  original 
  de- 
  

   scription 
  of 
  the 
  species 
  occurs 
  in 
  Sagni, 
  Ramon 
  de 
  la, 
  Historia 
  Fisica, 
  Politica 
  y 
  

   Natural 
  de 
  la 
  Isla 
  de 
  Cuba, 
  vol. 
  7, 
  Crustaceos, 
  Aragnides 
  e 
  Insectos, 
  1856 
  [Cuba]. 
  

   This 
  name 
  is 
  preoccupied 
  by 
  Ploiaria 
  pallida 
  Montrouzier, 
  P., 
  Essai 
  sur 
  la 
  

   Faune 
  de 
  l'lsle 
  de 
  Woodlark 
  ou 
  Moiou, 
  Ann. 
  Sci. 
  Phys. 
  Nat. 
  Lyon, 
  ser. 
  2, 
  vol. 
  7, 
  

   pt. 
  1, 
  1855, 
  p. 
  110. 
  

  

  SYSTEMATIC 
  ARRANGEMENT 
  OF 
  THE 
  AMERICAN 
  GENERA 
  

  

  In 
  connection 
  with 
  this 
  arrangement 
  we 
  would 
  first 
  point 
  out 
  that 
  

   in 
  this 
  as 
  in 
  most 
  groups 
  of 
  existing 
  insects 
  there 
  is 
  little 
  to 
  which 
  

   the 
  much 
  overworked 
  word 
  " 
  primitive 
  " 
  can 
  legitimately 
  be 
  applied. 
  

   Rather 
  we 
  have 
  in 
  the 
  modern 
  insect 
  world 
  the 
  products 
  of 
  speciali- 
  

   zation 
  along 
  a 
  multitude 
  of 
  intercrossing 
  lines, 
  any 
  one 
  of 
  which 
  

   may 
  be 
  highly 
  specialized 
  in 
  some, 
  and 
  but 
  little 
  specialized 
  in 
  other 
  

   respects. 
  The 
  selection 
  of 
  the 
  least 
  specialized 
  form 
  and 
  the 
  tracing 
  

   of 
  the 
  probable 
  course 
  of 
  evolution 
  in 
  a 
  group, 
  is, 
  therefore, 
  a 
  sub- 
  

   ject 
  upon 
  which 
  opinion 
  may 
  vary 
  greatly, 
  according 
  to 
  the 
  choice 
  

   of 
  characters 
  of 
  primary, 
  secondary, 
  and 
  lesser 
  degrees 
  of 
  im- 
  

   portance. 
  

  

  Adhering 
  to 
  the 
  idea 
  that 
  development 
  of 
  predatory 
  efficiency 
  is 
  

   the 
  course 
  of 
  evolution 
  of 
  the 
  Ploiariinae 
  we 
  believe 
  little 
  objection 
  

   can 
  be 
  made 
  to 
  placing 
  Emesopsis 
  at 
  the 
  base 
  of 
  the 
  American 
  series 
  

   of 
  genera. 
  While 
  the 
  venation 
  of 
  this 
  genus 
  is 
  more 
  complex 
  and 
  

  

  4 
  There 
  is 
  a 
  damaged 
  specimen 
  of 
  Ischnonyctes 
  in 
  the 
  National 
  Collection, 
  labelled 
  N. 
  O., 
  

   La., 
  R. 
  H. 
  Browne. 
  We 
  assume 
  this 
  is 
  an 
  accidentally 
  introduced 
  individual, 
  and 
  that 
  it 
  

   was 
  collected 
  in 
  New 
  Orleans. 
  

  

  