﻿602 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  g-. 
  Anterior 
  inferior 
  margin 
  of 
  fore 
  femora 
  armed 
  along 
  its 
  entire 
  length 
  

   with 
  stout 
  spines 
  which 
  diminish 
  in 
  length 
  toward 
  the 
  apex 
  (fig. 
  12) 
  ; 
  

  

  elytra 
  distinctly 
  marked 
  with 
  black 
  Supella 
  Shelford. 
  

  

  c^. 
  Elytra 
  of 
  male 
  falling 
  distinctly 
  short 
  of 
  the 
  tip 
  of 
  the 
  abdomen; 
  subgenital 
  

  

  plate 
  of 
  the 
  female 
  fissate 
  Blatta 
  Linnseus. 
  

  

  h-. 
  Antennae 
  basally 
  incrassate 
  and 
  densely 
  pilose 
  (fig. 
  13) 
  Pseudomops 
  Serville. 
  

  

  The 
  three 
  species 
  of 
  Periplaneta 
  represented 
  in 
  our 
  fauna 
  are 
  sep- 
  

   arable 
  by 
  the 
  characters 
  given 
  in 
  the 
  following 
  tables, 
  one 
  table 
  

   based 
  on 
  the 
  males 
  and 
  one 
  on 
  the 
  females. 
  

  

  Key 
  to 
  male 
  species 
  of 
  genus 
  Periplaneta. 
  

  

  a^. 
  Supraanal 
  plate 
  produced 
  considerably 
  beyond 
  the 
  subgenital 
  plate, 
  apicaUy 
  

  

  rounded 
  and 
  deeply 
  notched 
  americana 
  Linnaeus. 
  

  

  a^. 
  Supraanal 
  plate 
  not 
  or 
  scarcely 
  produced 
  beyond 
  the 
  subgenital 
  plate, 
  apically 
  

   truncate 
  and 
  not 
  deeply 
  notched, 
  

   fc'. 
  Elytra 
  marked 
  by 
  a 
  yellow 
  humeral 
  spripe, 
  in 
  distinct 
  contrast 
  to 
  the 
  color 
  of 
  

  

  the 
  rest 
  of 
  the 
  elytra 
  australasix 
  Fabricius. 
  

  

  fc^. 
  Elytra 
  without 
  a 
  distinct 
  yellow 
  humeral 
  stripe 
  brunnea 
  Burmeister. 
  

  

  Key 
  to 
  female 
  species 
  of 
  genus 
  Periplaneta. 
  

  

  a*. 
  Elytra 
  marked 
  by 
  a 
  yellow 
  humeral 
  stripe, 
  in 
  distinct 
  contrast 
  to 
  the 
  color 
  of 
  the 
  

  

  rest 
  of 
  the 
  elytra 
  australasix 
  Fabricius. 
  

  

  a-. 
  Elytra 
  without 
  a 
  distinct 
  yellow 
  humeral 
  stripe, 
  

   fe'. 
  Cerciwith 
  all 
  the 
  segments 
  except 
  the 
  last 
  one 
  or 
  two 
  quadrate 
  or 
  transverse, 
  

   the 
  whole 
  cercus 
  tapering 
  from 
  near 
  the 
  middle 
  (fig. 
  14) 
  ; 
  pronotum 
  usually 
  uni- 
  

   formly 
  shiny 
  blackish 
  brown, 
  rarely 
  with 
  paler 
  Tuoiiling 
  .brunnea 
  Burmeister. 
  

   b-. 
  Cerci 
  with 
  several 
  of 
  the 
  apical 
  segments 
  longer 
  than 
  broad, 
  the 
  whole 
  cer- 
  

   cus 
  tapering 
  from 
  about 
  the 
  base; 
  pronotum 
  always 
  with 
  paler 
  mottlings 
  

   (fig. 
  15) 
  americana 
  Linnaeus. 
  

  

  ' 
  "''ttoic^ 
  

  

  Fig. 
  14.— 
  Cerci 
  of 
  Pehipla- 
  Fig. 
  15.— 
  Cerci 
  of 
  Periplaneta 
  

  

  neta 
  brunnea, 
  female. 
  americana, 
  female. 
  

  

  Pelmatosilplia 
  rotundata 
  Scudder 
  is 
  the 
  only 
  member 
  of 
  that 
  genus 
  

   found 
  in 
  our 
  fauna. 
  

  

  Besides 
  the 
  common 
  black 
  roach 
  of 
  the 
  house, 
  Blatta 
  orientalis 
  

   Linnaeus, 
  we 
  have 
  one 
  other 
  member 
  of 
  this 
  genus 
  within 
  our 
  borders, 
  

   Blatta 
  rhombifolia 
  of 
  Stoll 
  having- 
  been 
  found 
  in 
  Arizona. 
  The 
  

   variegated 
  thorax 
  of 
  the 
  latter 
  species, 
  together 
  with 
  the 
  lateral 
  

   elytra 
  of 
  the 
  males, 
  will 
  serve 
  to 
  separate 
  it 
  at 
  a 
  glance 
  from 
  the 
  well- 
  

   known 
  house 
  species. 
  The 
  genus 
  Neostylopyga 
  Shelford 
  is 
  a 
  synonym 
  

   of 
  Blatta 
  Linnseus, 
  the 
  species 
  upon 
  which 
  it 
  is 
  based 
  belonging 
  to 
  

   Blatta 
  as 
  shown 
  by 
  me.^ 
  

  

  Of 
  Ischnoptera 
  we 
  have 
  several 
  species. 
  This 
  genus 
  has 
  been 
  

   recently 
  revised 
  by 
  Rehn 
  and 
  Hebard. 
  

  

  1 
  Psyche, 
  vol. 
  18, 
  1912, 
  p. 
  89. 
  

  

  