﻿600 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  Family 
  BLATTID^. 
  

  

  As 
  regards 
  subfamily 
  division 
  the 
  Blattida? 
  is 
  indeed 
  the 
  most 
  diffi- 
  

   cult 
  family 
  of 
  Orthoptera 
  with 
  which 
  the 
  systematist 
  has 
  to 
  deal. 
  

   Many 
  of 
  the 
  characters 
  used 
  for 
  the 
  separation 
  of 
  the 
  roaches 
  into 
  

   the 
  dozen 
  or 
  more 
  subfamilies 
  into 
  which 
  they 
  are 
  usually 
  divided 
  

   are 
  secondary 
  sexual 
  in 
  nature, 
  are 
  not 
  consistently 
  correlative, 
  or 
  

   are 
  otherwise 
  unsatisfactory. 
  Eleven 
  subfamilies 
  are 
  usally 
  recog- 
  

   nized 
  by 
  students 
  of 
  the 
  Blattidse, 
  but 
  Kirby 
  recognizes 
  16 
  in 
  his 
  

   Synonymic 
  Catalogue 
  of 
  Orthoptera. 
  Scudder 
  considered 
  the 
  nearctic 
  

   forms 
  as 
  catalogued 
  by 
  him 
  as 
  comprising 
  seven 
  famihes. 
  I 
  have 
  

   united 
  Periplanetinge 
  with 
  Blattinae, 
  their 
  distinguishing 
  feature 
  being 
  

   a'secondary 
  sexual 
  character. 
  The 
  late 
  Mr. 
  Shelford, 
  of 
  England, 
  an 
  

   authority 
  on 
  this 
  group, 
  inaugurated 
  this 
  change 
  some 
  months 
  ago. 
  

  

  ^ 
  

  

  ' 
  Fig. 
  8.— 
  Claws 
  of 
  Eueycotis, 
  showing 
  the 
  aroll*. 
  between 
  them. 
  

   Fig. 
  9.— 
  Pronotal 
  disk 
  of 
  Phyllodromica, 
  showing 
  coloration. 
  

  

  Fig. 
  10.— 
  Wing 
  of 
  Ischnoptera, 
  showing 
  venation. 
  t)=iNCOMPLETE 
  branches 
  of 
  the 
  ulnar 
  vein. 
  

   Fig. 
  11.— 
  Fore 
  femora 
  of 
  Blattella, 
  showing 
  ventral 
  armature. 
  

   Fig. 
  12.— 
  Fore 
  femora 
  of 
  Supella, 
  showing 
  ventral 
  armature. 
  

   Fig. 
  13.— 
  Antenna 
  of 
  Pseudomops, 
  showing 
  basal 
  swelling. 
  

  

  The 
  seven 
  subf 
  amihes 
  into 
  which 
  I 
  consider 
  the 
  nearctic 
  Blattidae 
  as 
  

   falling 
  may 
  be 
  separated 
  by 
  the 
  following 
  key. 
  

  

  Key 
  to 
  subfamilies 
  of 
  nearctic 
  Blattidse. 
  

  

  a^. 
  Middle 
  and 
  hind 
  femora 
  armed 
  beneath 
  along 
  one 
  or 
  both 
  margins 
  with 
  two 
  or 
  

   more 
  distinct 
  spines. 
  

   ¥ 
  . 
  Pronotum 
  and 
  elytra 
  densely 
  covered 
  with 
  microscopic 
  silky 
  pile 
  . 
  Nyctoborin^. 
  

  

  6^. 
  Pronotum 
  and 
  elytra 
  smooth, 
  or 
  but 
  sparsely 
  haired 
  or 
  pilose 
  Blattin/E. 
  

  

  a"^. 
  Middle 
  or 
  hind 
  femora, 
  or 
  both, 
  imarmed 
  beneath, 
  or 
  armed 
  with 
  hairs 
  or 
  bristles 
  

   only, 
  or 
  with 
  one 
  or 
  two 
  apical 
  or 
  subapical 
  spines 
  on 
  one 
  or 
  both 
  margins. 
  

   ¥. 
  Claws 
  separated 
  by 
  a 
  distinct 
  arolium 
  (fig. 
  8). 
  

  

  c^ 
  Wings 
  provided 
  with 
  a 
  distinct 
  apical 
  field 
  Plectopterin^. 
  

  

  c^. 
  Apterous, 
  or 
  the 
  wings 
  without 
  or 
  with 
  an 
  indistinct 
  apical 
  field. 
  

  

  Panchlorin^. 
  

   6^. 
  No 
  arolium 
  between 
  the 
  claws, 
  or 
  only 
  a 
  minute 
  one. 
  

   c^ 
  Anal 
  field 
  of 
  the 
  wing 
  with 
  a 
  single 
  fold, 
  or 
  apterous 
  with 
  the 
  pronotum 
  more 
  

   or 
  less 
  pilose 
  or 
  hairy 
  Corydin.e. 
  

  

  