﻿NO. 
  1970. 
  WEARCTIC 
  ORTHOPTEROVS 
  INSECTS— 
  CAVDELL. 
  597 
  

  

  Y&nety 
  forcipata 
  has 
  been 
  reported 
  but 
  once 
  from 
  within 
  our 
  borders 
  

   and 
  then 
  as 
  an 
  accidental 
  importation. 
  

  

  The 
  members 
  of 
  the 
  genus 
  Doru 
  (= 
  Apterygida 
  and 
  SpMngolahis 
  

   authors 
  not 
  Westwood 
  and 
  Bormans) 
  are 
  represented 
  by 
  two 
  species, 
  

   linearis 
  and 
  luteipennis. 
  D. 
  exilis 
  of 
  Scudder 
  I 
  have 
  reduced 
  to 
  varietal 
  

   rank 
  and 
  luteipennis 
  of 
  Serville 
  may 
  eventually 
  prove 
  to 
  be 
  but 
  a 
  

   form 
  of 
  that 
  species, 
  but 
  the 
  absence 
  of 
  the 
  wing 
  scale 
  makes 
  so 
  easy 
  

   its 
  separation 
  that 
  I 
  have 
  chosen 
  to 
  include 
  it 
  as 
  specifically 
  distinct. 
  

   D. 
  calif 
  oi^ica 
  Dohrn 
  scarcely 
  deserves 
  listing 
  as 
  of 
  varietal 
  distinctness 
  

   as 
  the 
  presence 
  or 
  absence 
  of 
  iimer 
  teeth 
  of 
  the 
  forceps 
  of 
  the 
  male 
  

   seems 
  to 
  mean 
  very 
  little. 
  The 
  same 
  variation 
  also 
  occurs 
  in 
  the 
  

   smaller 
  and 
  more 
  slender 
  exilis, 
  but 
  no 
  name 
  has 
  ever 
  been 
  assigned 
  

   to 
  it. 
  I), 
  exilis 
  is 
  but 
  a 
  small 
  form 
  of 
  linearis 
  and 
  shows 
  no 
  structures 
  

   of 
  specific 
  importance. 
  

  

  Of 
  the 
  subfamily 
  Chelisochinge 
  we 
  have 
  but 
  one 
  genus, 
  Chelisoches 
  

   of 
  Scudder, 
  which 
  contains 
  a 
  single 
  species 
  recorded 
  from 
  our 
  country, 
  

   the 
  C. 
  morio 
  of 
  Fabricius, 
  a 
  large 
  black 
  earwig 
  found 
  In 
  California. 
  

  

  The 
  subfamily 
  Labiinse 
  is 
  represented 
  in 
  nearctic 
  America 
  by 
  four 
  

   genera, 
  which 
  may 
  be 
  separated 
  as 
  follows. 
  

  

  Key 
  to 
  the 
  genera 
  of 
  the 
  subfamily 
  Lahiinx. 
  

  

  aK 
  Cheeks, 
  as 
  viewed 
  from 
  above, 
  as 
  long 
  as, 
  or 
  longer 
  than, 
  the 
  eyes 
  (fig. 
  3). 
  

  

  6'. 
  Fourth 
  antennal 
  segment 
  cylindrical 
  and' 
  as 
  long 
  as 
  the 
  third 
  segment 
  (fig. 
  2); 
  

  

  size 
  small, 
  rarely 
  over 
  7 
  mm. 
  in 
  length 
  including 
  the 
  forceps. 
  . 
  .Labia 
  Leach. 
  

  

  b^. 
  Fourth 
  antennal 
  segment 
  more 
  or 
  less 
  conical 
  and 
  distinctly 
  shorter 
  than 
  the 
  

  

  third 
  segment 
  (fig. 
  4); 
  size 
  larger, 
  rarely, 
  if 
  ever, 
  less 
  than 
  8 
  mm. 
  in 
  length 
  

  

  including 
  the 
  forceps. 
  

  

  c^. 
  Smaller, 
  entire 
  length, 
  including 
  forceps, 
  rarely 
  over 
  10 
  mm.; 
  eyes 
  smaller, 
  

  

  scarcely 
  as 
  long 
  as 
  the 
  basal 
  segment 
  of 
  the 
  antennae 
  Prolabia 
  Burr. 
  

  

  c^. 
  Larger, 
  entire 
  length, 
  including 
  forceps, 
  rarely 
  less 
  than 
  11 
  mm.; 
  eyes 
  larger, 
  

  

  about 
  as 
  long 
  as 
  the 
  basal 
  segment 
  of 
  the 
  antenna 
  Spongovostox 
  Burr. 
  

  

  a^. 
  Cheeks, 
  as 
  viewed 
  from 
  above, 
  shorter 
  than 
  the 
  eyes 
  (fig. 
  5) 
  Vostox 
  Burr. 
  

  

  Fig. 
  3.— 
  Head 
  of 
  

   Labia 
  from 
  

   above, 
  show- 
  

   ing 
  length 
  of 
  

   cheeks 
  behind 
  

  

  THE 
  EYES. 
  

  

  Fig. 
  4.— 
  Basal 
  portion 
  of 
  

  

  ANTENNA 
  OF 
  PEOLABIA, 
  

   SHOWING 
  RELATIVE 
  STRUC- 
  

   TURE 
  OF 
  THE 
  SEGMENTS. 
  

  

  Fig. 
  5.— 
  Head 
  OF 
  

  

  VoSTOX 
  FROM 
  

   ABOVE, 
  SHOW- 
  

   ING 
  THE 
  LENGTH 
  

   OF 
  THE 
  CHEEKS 
  

   BEHIND 
  THE 
  

   EYES. 
  

  

  These 
  genera 
  are 
  closely 
  related, 
  Prolahia 
  and 
  Spongovostox 
  indeed 
  

   being 
  scarcely 
  separable 
  from 
  species 
  found 
  in 
  our 
  fauna 
  except 
  by 
  

   the 
  uniformly 
  larger 
  size 
  of 
  the 
  latter. 
  Lahia 
  is 
  very 
  distmct 
  from 
  

   all 
  the 
  others 
  by 
  the 
  long 
  cylindrical 
  shape 
  of 
  the 
  fourth 
  segment 
  of 
  

   the 
  antennae 
  and 
  also 
  by 
  the 
  minute 
  size. 
  Vostox 
  agrees 
  with 
  Pro- 
  

  

  